CN116639997A - Porous ceramic body and electronic cigarette atomizer - Google Patents

Abstract

The present invention provides a kind of porous ceramic body, the preparation raw material of described porous ceramic body comprises main material, binding agent, pore former and additive, and described main material is fused silica powder; Said porous ceramic body is made of said main material , the binder, the pore forming agent and the additive are mixed and formed by injection molding and sintering. The porous ceramic body provided by the present invention not only has less impurity content and higher whiteness, but also has a more concentrated pore size distribution, which makes the atomized particles finer, thereby improving the atomized taste. The invention also provides an electronic cigarette vaporizer.

Description

Porous ceramic body and electronic atomizer

technical field

The invention relates to the technical field of electronic cigarettes, in particular to a porous ceramic body and an electronic cigarette vaporizer.

Background technique

Electronic cigarettes, also known as virtual cigarettes, steam cigarettes, aerosol generating devices, etc., are mainly used to simulate the feeling of smoking without affecting health, so as to quit smoking or replace cigarettes. As one of the core components of electronic cigarettes, the porous ceramic atomizer has the advantages of strong lipophilicity and high operating temperature compared with traditional cotton cores or glass fiber ropes.

A porous ceramic atomizer generally includes a porous ceramic body and a heat generating substrate arranged on the porous ceramic body. Among them, the porous ceramic body is generally made of silicate, diatomite, etc. as the main material through injection molding and sintering, and silicate and diatomite are generally not treated with impurities, and silicate and diatomite contain more Impurities, impurities will reduce the whiteness of the porous ceramic body, thereby affecting the appearance of the porous ceramic body; at the same time, the particle size distribution of silicate and diatomaceous earth is relatively large (that is, the particle size distribution is not concentrated), so that the prepared porous ceramic The pore size distribution of the micropores in the body varies greatly, which makes the taste of the atomized particles not delicate enough, which affects the user experience.

Contents of the invention

The purpose of the present invention is to provide a porous ceramic body, which not only has less impurity content and higher whiteness, but also has a more concentrated pore size distribution, making the atomized particles finer, thereby improving the taste of the atomized atomizer.

The present invention provides a kind of porous ceramic body, the preparation raw material of described porous ceramic body comprises main material, binder, pore-forming agent and additive, and described main material is fused silica powder; Said porous ceramic body is made of said main material , the binder, the pore forming agent and the additive are mixed and formed by injection molding and sintering.

In a practicable manner, the main ingredients are calcined at a high temperature before mixing, so as to further reduce impurities in the main ingredients.

In a practicable manner, the main material is sieved after high-temperature calcination, so that the particle size of the main material is concentrated and distributed within a certain range.

In a practicable manner, the main material includes a first fused silica powder and a second fused silica powder, the mesh number of the first fused silica powder is greater than that of the second fused silica powder, and the The difference between the mesh number of the first fused silica powder and the mesh number of the second fused silica powder is 400-500 mesh.

In a practicable manner, in the main material, the weight ratio of the first fused silica powder to the second fused silica powder is (1:1)˜(1:3).

In an achievable manner, the mesh number of the main material is 100-1000 mesh.

In a practicable manner, the binder is glass powder, the pore-forming agent is PMMA, and the parts by weight of the main material, the binder and the pore-forming agent are respectively: The main ingredient is 160-240 parts, the binder is 40-80 parts, and the pore-forming agent is 80-140 parts.

In an achievable manner, the additive includes white carbon black, a plasticizer and stearic acid, and the plasticizer is at least one of paraffin wax and beeswax; the white carbon black, the plasticizer The parts by weight of the agent and the stearic acid are respectively: the white carbon black is 5-15 parts, the plasticizer is 80-140 parts, and the stearic acid is 10-30 parts.

In a practicable manner, the preparation method of the porous ceramic body includes the following steps:

S10: Calcining the main material at a temperature of 1000°C-1100°C for 1-2 hours, then crushing the main material, and then sieving the main material with a sieve with a certain mesh to obtain the first intermediate material; the first intermediate material is mixed with white carbon black, binder and pore-forming agent and ball milled for a period of time to obtain the second intermediate material; after adding plasticizer and stearic acid to the second intermediate material, stir For a period of time, the stirring temperature is controlled at 80°C-100°C to obtain ceramic slurry;

S20: placing the ceramic slurry in an injection molding machine for injection molding to obtain a ceramic green body;

S30: Dewaxing and sintering the ceramic green body to obtain a porous ceramic body.

The present invention also provides an electronic cigarette atomizer, comprising the above-mentioned porous ceramic body.

The porous ceramic body provided by the present invention adopts fused silica powder as the main material, and is formed by injection molding and sintering after mixing the main material, binder, pore-forming agent and additive; Compared with the traditional quartz powder, the resulting micropowder not only has fewer impurities and higher purity, but also makes the prepared porous ceramic body less impurity content (the content of related impurity elements detected by ROHS is lower, thereby reducing the impact on the human body. Harm), higher whiteness, better appearance, and the particle size of the fused silica powder is controllable, which makes the pore size distribution of the porous ceramic body more concentrated, making the atomized particles more delicate, thereby improving the taste of atomization. At the same time, the spherical lipophilic surface of the fused silicon micropowder is relatively large (that is, the fused silica micropowder has a large roundness and a high specific surface area), which makes the porous ceramic body have good oil-conducting performance.

Description of drawings

Fig. 1 is a schematic diagram of the production process of the porous ceramic body in the embodiment of the present invention.

Fig. 2 is a schematic diagram of the manufacturing steps of the porous ceramic body in the embodiment of the present invention.

Fig. 3 is a schematic diagram showing the comparison of the test results of Embodiment 1 to Embodiment 5 of the present invention and a comparative example.

Detailed ways

The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

The terms "first", "second", "third", "fourth", etc. (if any) in the description and claims of the present invention are used to distinguish similar objects and not necessarily to describe specific sequence or sequence.

The up, down, left, right, front, back, top, bottom, etc. (if any) orientation words involved in the specification and claims of the present invention refer to the positions in the drawings of the structures in the drawings and the relationship between the structures. It is only defined for the clarity and convenience of expressing the technical solution. It should be understood that the use of location words should not limit the scope of protection claimed by the present invention.

The porous ceramic body provided by the embodiment of the present invention, its preparation raw material comprises main material, binder, pore-forming agent and additive, and main material is fused silica powder; Porous ceramic body is made of main material, binder, pore-forming agent and additive Formed by injection molding and sintering after mixing.

Specifically, fused silica powder is a kind of amorphous silica powder produced by melting natural quartz at high temperature and then cooling, and then processed by crushing, sorting, grinding, grading and other processes. Fused silica powder has high purity (SiO ₂ content generally reaches 99.8% and above), and has a reasonable, orderly and controllable particle size distribution.

The porous ceramic body provided in this embodiment adopts fused silica powder as the main material, and is formed by injection molding and sintering after mixing the main material, binder, pore-forming agent and additives; Compared with the traditional quartz powder, the processed micropowder not only has fewer impurities and higher purity, but also makes the prepared porous ceramic body less impurity content (the content of related impurity elements detected by ROHS is lower, thereby reducing the impact on Harm to the human body), higher whiteness, better appearance, and the particle size of the fused silica powder is controllable, which makes the pore size distribution of the porous ceramic body more concentrated, making the atomized particles more delicate, thereby improving the taste of atomization. At the same time, the spherical lipophilic surface of the fused silicon micropowder is relatively large (that is, the fused silica micropowder has a large roundness and a high specific surface area), which makes the porous ceramic body have good oil-conducting performance.

As an embodiment, the main material is calcined at high temperature before being mixed with the binder, pore-forming agent and additives, so as to further reduce impurities in the main material, thereby further improving the whiteness of the porous ceramic body.

As an embodiment, the calcination temperature of the main material is 1000°C-1100°C, and the calcination time is 1-2 hours.

As an embodiment, the main material is sieved after high-temperature calcination, so that the particle size of the main material is concentrated and distributed within a certain range. That is to say, after the main material is calcined at high temperature, the main material is screened with a certain mesh number of screens, so as to screen out the fused silica powder with the required particle size distribution, so that the particle size distribution of the fused silica powder aggregate is more concentrated, making The pore size distribution of the sintered porous ceramic body is more concentrated.

As an embodiment, after the high-temperature calcination and before the sieving treatment, the main material is further crushed (for example, crushed by a pulverizer). Since the surface free energy of the main material will stick together to form lumps (ie agglomerates) after being calcined at high temperature, it needs to be crushed first to facilitate subsequent sieving.

As an embodiment, the main ingredient includes the first fused silicon powder and the second fused silicon powder, and the mesh number of the first fused silicon powder is greater than that of the second fused silicon powder (the larger the mesh number of the fused silicon powder, the corresponding The smaller the particle size; that is, the particle size of the first fused silicon powder is less than the particle size of the second fused silicon powder), the difference between the mesh number of the first fused silicon powder and the second fused silicon powder is 400-500 mesh , that is, the mesh number of the first fused silica powder is 400-500 mesh larger than the mesh number of the second fused silica powder. The first fused silicon micropowder and the second fused silicon micropowder can be obtained by selecting main materials with different meshes respectively, and then sifting through sieves with different meshes.

Specifically, due to the weak strength of the porous ceramic body formed by sintering fused silica powder with a single mesh, the combination of fused silica powder with different meshes plays a role in strengthening and toughening, and the matching difference of fused silica powder is 400-500 mesh, for example, 1000 mesh fused silica powder and 600 mesh or 500 mesh fused silica powder are mixed and matched (that is, the first fused silica powder is 1000 mesh, and the second fused silica powder is 600 mesh or 500 mesh). Through the above arrangement, the gaps formed between large particles of fused silica powder can be filled with small particles of fused silica powder, thereby making the connection between particles closer, thereby improving the strength of the porous ceramic body.

It should be noted that in this embodiment, two kinds of fused silica powders with different meshes are used as the main material for mixing, which does not increase the particle size distribution range of the main material, but concentrates the particle size of the main material in the first molten silicon powder. The microsilica powder and the second fused silica micropowder are within the two particle diameter ranges.

As an embodiment, in the main material, the weight ratio of the second fused silicon powder is greater than or equal to the weight ratio of the first fused silicon powder, that is, the number of large particles of fused silicon powder is more, thereby providing a porous ceramic body. strength base.

As an embodiment, in the main material, the weight ratio of the first fused silicon micropowder to the second fused silicon micropowder is (1:1)˜(1:3).

As an embodiment, the mesh size of the main material is 100-1000 mesh, and the corresponding particle size of the main material is 150-13 microns.

As an embodiment, the mesh size of the main material is 300-1000 mesh, and the corresponding particle size of the main material is 48-13 microns.

As an embodiment, the binder is glass frit, specifically glass frit composed of SiO ₂ , Li ₂ O, ZnO, BaO, K ₂ O, Na ₂ O, etc., and the mesh number of the binder is 1800. -2000 mesh. The pore-forming agent is PMMA, and the median particle diameter D50 of the pore-forming agent is 30-70 microns, which can be adjusted in a wide range, and can flexibly adjust the pore size distribution of the porous ceramic body according to actual needs. The parts by weight of the main material, the binder and the pore-forming agent are respectively: the main material is 160-240 parts, the binder is 40-80 parts, and the pore-forming agent is 80-140 servings.

As an embodiment, the additive includes white carbon black, a plasticizer and stearic acid, and the plasticizer is at least one of paraffin wax and beeswax. White carbon black can increase the fluidity of the slurry, make the mixing between the preparation materials more uniform, and it is not easy to cause particle precipitation, so that the pore size is more uniform; moreover, white carbon black is a white powder, which will not affect the whiteness of the porous ceramic body. Spend. The parts by weight of the white carbon black, the plasticizer and the stearic acid are respectively: the white carbon black is 5-15 parts, the plasticizer is 80-140 parts, and the stearin The acid is 10-30 parts.

As an embodiment, the porosity of the porous ceramic body is 50%-60%.

As shown in Figure 1 and Figure 2, as an embodiment, the preparation method of the porous ceramic body includes the following steps:

S10: Calcining the main material at a temperature of 1000°C-1100°C for 1-2 hours, then crushing the main material, and then sieving the main material with a sieve with a certain mesh to obtain the first intermediate Material (the framework powder in Fig. 1); The first intermediate material is mixed with white carbon black, binding agent and pore-forming agent and ball milled for a period of time to obtain the second intermediate material (ceramic powder in Fig. 1); Adding plasticizer and stearic acid to the second intermediate material and stirring for a period of time, the stirring temperature is controlled at 80°C-100°C to obtain a ceramic slurry;

S20: placing the ceramic slurry in an injection molding machine for injection molding to obtain a ceramic green body;

S30: Dewaxing and sintering the ceramic green body to obtain a porous ceramic body.

As an embodiment, in the above step S10, the main material is sieved by using a 100-1000 mesh screen.

As an implementation, in the above S10 step, the main ingredients include the first fused silicon powder and the second fused silicon powder, the mesh number of the first fused silicon powder is greater than the mesh number of the second fused silicon powder, and the first fused silicon powder The difference between the mesh number and the mesh number of the second fused silica powder is 400-500 mesh, and the weight ratio of the first fused silica powder and the second fused silica powder is (1:1)˜(1:3). Calcining the first fused silica powder and the second fused silica powder at 1000°C-1100°C for 1-2 hours respectively, then crushing the first fused silica powder and the second fused silica powder, and then using the first sieve The first fused silicon powder and the second fused silicon powder are sieved by the net and the second screen cloth (wherein, the mesh number of the first screen mesh corresponds to the mesh number of the first fused silicon powder, for example, the first fused silicon powder If the number of meshes is concentrated at 1000 meshes, the number of meshes of the first screen is 1000 meshes; the number of meshes of the second screen corresponds to the number of meshes of the second fused silicon powder, for example, the mesh number of the second fused silicon powder is concentrated At 500 mesh, the mesh number of the second sieve is 500 mesh), and the first intermediate material is obtained, which is a mixture of the first fused silicon micropowder and the second fused silicon micropowder.

As an embodiment, in the above step S10, the first intermediate material is mixed with white carbon black, binder and pore forming agent and ball milled for 3-5 hours.

As an embodiment, in the above step S10, the second intermediate material is stirred with the plasticizer and stearic acid for 3-5 hours; and after the stirring, vacuum defoaming treatment is performed on the ceramic slurry.

As an implementation manner, in the above step S20, during injection molding, the injection molding pressure is controlled at 0.2-0.6 Mpa, and the holding time is 2-5 seconds.

As an embodiment, in the above step S30, the wax removal temperature is 200°C-250°C, and the wax removal time is 0.5-1.5 hours; the sintering temperature is 600°C-700°C, and the sintering time is 0.5-2 hours.

As an embodiment, a heating element is provided on the surface of the porous ceramic body, and the heating element can be combined with the ceramic green body by injection molding in the above step S20, and the heating element is combined with the porous ceramic body after sintering. The heating element can be stainless steel mesh (316, 304 and stainless steel temperature control wire), nickel-chromium mesh, iron-chromium-aluminum mesh, chromium mesh, titanium mesh and spiral nautilus heating wire, etc., and its material can be stainless steel, nickel-chromium, iron-chromium Aluminum, titanium, chromium, etc. The heating body can be a single-layer network structure or a double-network structure, that is, it includes two heating networks, and the two heating networks can be stacked up and down, or arranged side by side (the two heating networks can be connected in parallel or are independent of each other; the two heating nets can be set on the same surface of the porous ceramic body, and can also be set on different surfaces of the porous ceramic body).

An embodiment of the present invention also provides an electronic cigarette atomizer, comprising the above-mentioned porous ceramic body.

The porous ceramic body provided by the embodiment of the present invention adopts fused silica powder as the main material, and is formed by injection molding and sintering after mixing the main material, binder, pore-forming agent and additives; Compared with the traditional quartz powder, the micropowder processed by the technology not only has fewer impurities and higher purity, but also makes the prepared porous ceramic body have less impurity content, higher whiteness and better appearance, and the fused silica micropowder The particle size is controllable, which makes the pore size distribution of the porous ceramic body more concentrated, making the atomized particles more delicate, thereby improving the taste of atomization. At the same time, the spherical lipophilic surface of the fused silicon micropowder is larger, so that the porous ceramic body has good oil-conducting performance.

At the same time, by calcining the main material at high temperature, the impurities in the main material are further reduced, and the whiteness of the porous ceramic body is improved. Moreover, the main material is sieved after high-temperature calcination, so that the particle size distribution of the molten silica powder aggregate is more concentrated, and the pore size distribution of the sintered porous ceramic body is more concentrated.

Embodiment one

The preparation raw material of the porous ceramic body of the present embodiment comprises:

Main ingredients: 200 parts, fused silica powder, the mesh numbers are 1000 mesh and 500 mesh respectively, the ratio is 1:1;

White carbon black: 10 parts;

Binder: 60 parts, glass powder composed of SiO ₂ , Li ₂ O, ZnO, BaO, K ₂ O, Na ₂ O, etc., 2000 mesh;

Pore-forming agent: 120 parts, PMMA, particle size D50 is 30 microns;

Plasticizer: 120 parts, paraffin;

Stearic acid: 20 parts.

Calcining the main material at a temperature of 1050° C. for 1 hour, then crushing the main material, and then sieving the main material with a sieve with a certain mesh number to obtain a first intermediate material; The intermediate material was mixed with white carbon black, binder and pore-forming agent for 4 hours and ball milled to obtain the second intermediate material; after adding plasticizer and stearic acid to the second intermediate material, it was stirred for 4 hours, and the stirring temperature was controlled at 90°C to obtain a ceramic slurry. The ceramic slurry is placed in an injection molding machine for injection molding together with the heating element, the injection molding pressure is controlled at 0.4 MPa, and the holding time is 2 seconds to obtain a ceramic green body. Then dewax the ceramic green body, the dewax temperature is 220°C, and the dewax time is 1 hour; after taking it out, clean the dewax powder, and then sinter, the sintering temperature is 660°C, the sintering time is 2 hours, and the obtained thickness is 2.3 mm, a porous ceramic body with a length of 6 mm and an outer diameter of 4.3 mm. The porosity of the porous ceramic body is 50%-60%. The resistance of the control heating element is 1.2 ohms. The material of the heating element is nickel chromium.

Embodiment two

The preparation raw material of the porous ceramic body of the present embodiment comprises:

Main ingredients: 200 parts, fused silica powder, the mesh numbers are 800 mesh and 300 mesh respectively, the ratio is 1:1;

White carbon black: 10 parts;

Binder: 60 parts, glass powder composed of SiO ₂ , Li ₂ O, ZnO, BaO, K ₂ O, Na ₂ O, etc., 2000 mesh;

Pore-forming agent: 120 parts, PMMA, particle size D50 is 50 microns;

Plasticizer: 120 parts, paraffin;

Stearic acid: 20 parts.

Calcining the main material at a temperature of 1050° C. for 1 hour, then crushing the main material, and then sieving the main material with a sieve with a certain mesh number to obtain a first intermediate material; The intermediate material was mixed with white carbon black, binder and pore-forming agent for 4 hours and ball milled to obtain the second intermediate material; after adding plasticizer and stearic acid to the second intermediate material, it was stirred for 4 hours, and the stirring temperature was controlled at 90°C to obtain a ceramic slurry. The ceramic slurry is placed in an injection molding machine for injection molding together with the heating element, the injection molding pressure is controlled at 0.4 MPa, and the holding time is 2 seconds to obtain a ceramic green body. Then dewax the ceramic green body, the dewax temperature is 220°C, and the dewax time is 1 hour; after taking it out, clean the dewax powder, and then sinter, the sintering temperature is 660°C, the sintering time is 2 hours, and the obtained thickness is 2.3 mm, a porous ceramic body with a length of 6 mm and an outer diameter of 4.3 mm. The porosity of the porous ceramic body is 50%-60%. The resistance of the control heating element is 1.2 ohms. The material of the heating element is nickel chromium.

Embodiment three

The preparation raw material of the porous ceramic body of the present embodiment comprises:

Main ingredients: 240 parts, fused silica powder, the mesh numbers are 700 mesh and 300 mesh respectively, the ratio is 1:1;

White carbon black: 10 parts;

Binder: 60 parts, glass powder composed of SiO ₂ , Li ₂ O, ZnO, BaO, K ₂ O, Na ₂ O, etc., 2000 mesh;

Pore-forming agent: 120 parts, PMMA, particle size D50 is 70 microns;

Plasticizer: 120 parts, paraffin;

Stearic acid: 20 parts.

Calcining the main material at a temperature of 1050° C. for 1 hour, then crushing the main material, and then sieving the main material with a sieve with a certain mesh number to obtain a first intermediate material; The intermediate material was mixed with white carbon black, binder and pore-forming agent for 4 hours and ball milled to obtain the second intermediate material; after adding plasticizer and stearic acid to the second intermediate material, it was stirred for 4 hours, and the stirring temperature was controlled at 90°C to obtain a ceramic slurry. The ceramic slurry is placed in an injection molding machine for injection molding together with the heating element, the injection molding pressure is controlled at 0.4 MPa, and the holding time is 2 seconds to obtain a ceramic green body. Then dewax the ceramic green body, the dewax temperature is 220°C, and the dewax time is 1 hour; after taking it out, clean the dewax powder, and then sinter, the sintering temperature is 660°C, the sintering time is 2 hours, and the obtained thickness is 2.3 mm, a porous ceramic body with a length of 6 mm and an outer diameter of 4.3 mm. The porosity of the porous ceramic body is 50%-60%. The resistance of the control heating element is 1.2 ohms. The material of the heating element is nickel chromium.

Embodiment four

The preparation raw material of the porous ceramic body of the present embodiment comprises:

Main ingredients: 180 parts, fused silica powder, the mesh numbers are 900 mesh and 400 mesh respectively, the ratio is 1:1;

White carbon black: 10 parts;

Binder: 80 parts, glass powder composed of SiO ₂ , Li ₂ O, ZnO, BaO, K ₂ O, Na ₂ O, etc., 2000 mesh;

Pore-forming agent: 120 parts, PMMA, particle size D50 is 70 microns;

Plasticizer: 120 parts, paraffin;

Stearic acid: 20 parts.

Calcining the main material at a temperature of 1050° C. for 1 hour, then crushing the main material, and then sieving the main material with a sieve with a certain mesh number to obtain a first intermediate material; The intermediate material was mixed with white carbon black, binder and pore-forming agent for 4 hours and ball milled to obtain the second intermediate material; after adding plasticizer and stearic acid to the second intermediate material, it was stirred for 4 hours, and the stirring temperature was controlled at 90°C to obtain a ceramic slurry. The ceramic slurry is placed in an injection molding machine for injection molding together with the heating element, the injection molding pressure is controlled at 0.4 MPa, and the holding time is 2 seconds to obtain a ceramic green body. Then dewax the ceramic green body, the dewax temperature is 220°C, and the dewax time is 1 hour; after taking it out, clean the dewax powder, and then sinter, the sintering temperature is 660°C, the sintering time is 2 hours, and the obtained thickness is 2.3 mm, a porous ceramic body with a length of 6 mm and an outer diameter of 4.3 mm. The porosity of the porous ceramic body is 50%-60%. The resistance of the control heating element is 1.2 ohms. The material of the heating element is nickel chromium.

Embodiment five

The preparation raw material of the porous ceramic body of the present embodiment comprises:

Main ingredients: 200 parts, fused silica powder without high-temperature calcination and sieving treatment, the mesh number is 1000 mesh;

Binder: 60 parts, glass powder composed of SiO ₂ , Li ₂ O, ZnO, BaO, K ₂ O, Na ₂ O, etc., 2000 mesh;

Pore-forming agent: 120 parts, PMMA, particle size D50 is 70 microns;

Plasticizer: 120 parts, paraffin;

Stearic acid: 20 parts.

The main material in this example does not undergo high-temperature calcination and sieving treatment, and the main material only contains fused silica powder of one mesh size (1000 mesh); at the same time, no white carbon black is added to the raw material. Mix the main material with the binder and pore-forming agent and ball mill for 4 hours to obtain an intermediate material; add plasticizer and stearic acid to the intermediate material and stir for 4 hours, the stirring temperature is controlled at 90°C to obtain a ceramic slurry . The ceramic slurry is placed in an injection molding machine for injection molding together with the heating element, the injection molding pressure is controlled at 0.4 MPa, and the holding time is 2 seconds to obtain a ceramic green body. Then dewax the ceramic green body, the dewax temperature is 220°C, and the dewax time is 1 hour; after taking it out, clean the dewax powder, and then sinter, the sintering temperature is 660°C, the sintering time is 2 hours, and the thickness is 2.3 mm, a porous ceramic body with a length of 6 mm and an outer diameter of 4.3 mm. The porosity of the porous ceramic body is 50%-60%, the resistance of the control heating element is 1.2 ohms, the material of the heating element is nickel chromium, and the heating element is a single-layer heating mesh structure.

comparative example

The preparation raw material of the porous ceramic body of this comparative example comprises:

Main ingredients: 200 parts, diatomite;

Binder: 60 parts, glass powder composed of SiO ₂ , Li ₂ O, ZnO, BaO, K ₂ O, Na ₂ O, etc., 2000 mesh;

Pore-forming agent: 120 parts, PMMA, particle size D50 is 70 microns;

Plasticizer: 120 parts, paraffin;

Stearic acid: 20 parts.

Mix the main material with the binder and pore-forming agent and ball mill for 4 hours to obtain an intermediate material; add plasticizer and stearic acid to the intermediate material and stir for 4 hours, the stirring temperature is controlled at 90°C to obtain a ceramic slurry . The ceramic slurry is placed in an injection molding machine for injection molding together with the heating element, the injection molding pressure is controlled at 0.4 MPa, and the holding time is 2 seconds to obtain a ceramic green body. Then dewax the ceramic green body, the dewax temperature is 220°C, and the dewax time is 1 hour; after taking it out, clean the dewax powder, and then sinter, the sintering temperature is 660°C, the sintering time is 2 hours, and the obtained thickness is 2.3 mm, a porous ceramic body with a length of 6 mm and an outer diameter of 4.3 mm. The resistance of the control heating element is 1.2 ohms, the material of the heating element is nickel chromium, and the heating element is a single-layer heating mesh structure, which is for standby testing.

The porous ceramic bodies prepared in the above-mentioned five examples and one comparative example were respectively put into test smoking utensils to test the oil conduction rate, whiteness, pore size and strength. The specific test results are shown in FIG. 3 .

As can be seen from Figure 3, the whiteness of the porous ceramic bodies of each embodiment is greatly improved compared with the porous ceramic bodies of the comparative examples, and the pore size distribution range is narrowed (that is, the pore size difference is reduced, and the pore size distribution is more concentrated) , and the oil conduction rate is not much different. Simultaneously, comparing Embodiment 5 with Embodiment 1 to Embodiment 4, it can be seen that when the porous ceramic body is made of fused silica powder with different mesh numbers, its strength is greatly improved, and adding white carbon black can Improve the uniformity of the mixture, thereby finally improving the pore size distribution of the porous ceramic body; at the same time, because the main material is calcined in Embodiment 1 to Embodiment 4 (the main material is not calcined in Example 5), impurities can be further removed, Therefore the whiteness of embodiment one to embodiment four will be greater than embodiment five; Simultaneously, embodiment one to embodiment four is owing to carrying out sieving process to main material (main material is not through sieving process in embodiment five), makes main material particle The pore size distribution is more concentrated, so the pore size distribution range of the porous ceramic bodies in Examples 1 to 4 is narrower.

The above is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Anyone familiar with the technical field can easily think of changes or replacements within the technical scope disclosed in the present invention, and should cover all Within the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims (10)

1. a porous ceramic body, is characterized in that, the preparation raw material of described porous ceramic body comprises main material, binding agent, pore-forming agent and additive, and described main material is fused silica powder; Described porous ceramic body is made of said porous ceramic body The main material, the binder, the pore-forming agent and the additive are mixed and formed by injection molding and sintering. 2 . The porous ceramic body according to claim 1 , wherein the main ingredients are calcined at high temperature before being mixed, so as to further reduce impurities in the main ingredients. 3 . 3 . The porous ceramic body according to claim 2 , wherein the main material is sieved after being calcined at high temperature, so that the particle size of the main material is concentrated and distributed within a certain range. 4 . 4. The porous ceramic body according to claim 1, wherein the main material comprises a first fused silicon powder and a second fused silicon powder, and the mesh number of the first fused silicon powder is larger than that of the second molten silicon powder. The mesh number of the silicon micropowder, the difference between the mesh number of the first fused silicon micropowder and the mesh number of the second fused silicon micropowder is 400-500 mesh. 5. The porous ceramic body according to claim 4, characterized in that, in the main material, the weight ratio of the first fused silica powder and the second fused silica powder is (1:1) to (1 :3). 6. The porous ceramic body according to claim 1, characterized in that the mesh number of the main material is 100-1000 mesh. 7. porous ceramic body as claimed in claim 1, is characterized in that, described binding agent is glass powder, and described pore-forming agent is PMMA, and described main material, described binding agent and described pore-forming agent The parts by weight are respectively: the main material is 160-240 parts, the binder is 40-80 parts, and the pore-forming agent is 80-140 parts. 8. The porous ceramic body according to any one of claims 1-7, wherein the additive comprises white carbon black, a plasticizer and stearic acid, and the plasticizer is paraffin and beeswax At least one; the parts by weight of the white carbon black, the plasticizer and the stearic acid are respectively: the white carbon black is 5-15 parts, the plasticizer is 80-140 parts, Described stearic acid is 10-30 parts. 9. porous ceramic body as claimed in claim 8, is characterized in that, the preparation method of described porous ceramic body comprises the following steps: S10: Calcining the main material at a temperature of 1000°C-1100°C for 1-2 hours, then crushing the main material, and then sieving the main material with a sieve with a certain mesh to obtain the first intermediate material; the first intermediate material is mixed with white carbon black, binder and pore-forming agent and ball milled for a period of time to obtain the second intermediate material; after adding plasticizer and stearic acid to the second intermediate material, stir For a period of time, the stirring temperature is controlled at 80°C-100°C to obtain ceramic slurry; S20: placing the ceramic slurry in an injection molding machine for injection molding to obtain a ceramic green body; S30: Dewaxing and sintering the ceramic green body to obtain a porous ceramic body. 10. An electronic cigarette atomizer, characterized in that it comprises the porous ceramic body according to any one of claims 1-9.