WO1999036373A1 - Ceramic material - Google Patents
Ceramic material Download PDFInfo
- Publication number
- WO1999036373A1 WO1999036373A1 PCT/IB1999/000023 IB9900023W WO9936373A1 WO 1999036373 A1 WO1999036373 A1 WO 1999036373A1 IB 9900023 W IB9900023 W IB 9900023W WO 9936373 A1 WO9936373 A1 WO 9936373A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- ceramic material
- radiation
- oxide
- microns
- mgo
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/10—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor
- H05B3/12—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material
- H05B3/14—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material the material being non-metallic
- H05B3/141—Conductive ceramics, e.g. metal oxides, metal carbides, barium titanate, ferrites, zirconia, vitrous compounds
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C10/00—Devitrified glass ceramics, i.e. glass ceramics having a crystalline phase dispersed in a glassy phase and constituting at least 50% by weight of the total composition
- C03C10/0054—Devitrified glass ceramics, i.e. glass ceramics having a crystalline phase dispersed in a glassy phase and constituting at least 50% by weight of the total composition containing PbO, SnO2, B2O3
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/16—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay
- C04B35/18—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay rich in aluminium oxide
- C04B35/195—Alkaline earth aluminosilicates, e.g. cordierite or anorthite
Definitions
- the present invention relates to the field of ceramic materials capable of generating infrared (LR) radiation with specified wavelengths. More particularly, it relates to ceramic materials with enhanced thermal, chemical and physical stability which can be used in highly efficient heaters and emitters for various applications in such areas as: medicine, for treating diseases; the food industry, for processing and preparing foodstuffs; in the light industry (textiles); and in manufacturing lining mate- rials.
- LR infrared
- This composition is used as a converting material to obtain IR radiation with stable properties.
- the above ceramic material absorbs either pulse IR radiation from another ceramic material capable of generating only pulse IR radiation, or radiation from lamps, heating coils, etc, and generates continuous IR radiation at a wave- length of 16 microns ( ⁇ ).
- a shortcoming of the material is that it is impossible to obtain stable IR radiation with a wavelength within 9-10 microns ( ⁇ ).
- the object of the proposed invention is to create a ceramic material with controlled properties capable of generating stable secondary IR radiation with a wavelength within 9-10 microns ( ⁇ ).
- the goal is achieved by supplementing a material containing silicon dioxide SiO 2 , aluminium oxide Al 2 O 3 , and magnesium oxide MgO by boron oxide B 2 O 3 , in the following proportions of ingredients, wt%: silicon dioxide SiO 2 50.0-55.0 aluminium oxide Al 2 O 3 27.0-31.0 magnesium oxide MgO 12.0-16.0 boron oxide B 2 O 3 2.0 - 7.0
- the proposed ceramic material is prepared following conventional procedure.
- the ingredients are ground in a planetary mill using Plexiglas drums and Teflon balls until a fine powder is obtained. After being dried, the powder is put in a crucible of a solar furnace, where it is melted. The melting is usually done in conditions reducing the loss of the oxygen from the obtained powder, preferably in oxi- dative atmospheres, best of all in air. Generally, these ceramic compositions on the basis of silicon dioxide are melted at a temperature of about 1,900°C. The melt drips into a cooling tank filled with water. Thus is the proposed ceramic material • obtained.
- the obtained body is ground, pressed into an item of the desired shape, and sintered at a temperature of 1,600°C.
- the obtained body is ground, mixed with a binder based on polyvinyl alcohol or soluble glass, and applied to the surface of the heating elements that are the source of primary IR radiation, or that of other articles to be used as sources of secondary IR radiation.
- a charge was prepared of the following composition, wt%: silicon oxide SiO 2 50.0 aluminium oxide Al 2 O 3 29.0 magnesium oxide MgO 14.0 boron oxide B 2 O 3 7.0
- the charge was then mixed in a planetary mill using Plexiglas drums and Teflon balls until a fine powder was obtained.
- the powder was put in a crucible of a solar furnace and melted at 1,900°C in air. The melt was dripped into a cooling tank filled with water. Thus was the ceramic material obtained.
- Example 2 has the optimum composition which ensures the desired properties of IR radiation within 9-10 microns ( ⁇ ).
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Crystallography & Structural Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Life Sciences & Earth Sciences (AREA)
- Dispersion Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Structural Engineering (AREA)
- Compositions Of Oxide Ceramics (AREA)
Abstract
The invention 'Ceramic material' relates to ceramic materials capable of generating infrared radiation with specified wavelengths. The object of the invention is to obtain a ceramic material with controlled properties, which is capable of generating stable secondary infrared radiation with a wavelength within 9-10 microns (ν). To achieve the goal, the ceramic material is prepared from the following ingredients, wt %: silicon dioxide SiO2 50.0-55.0; aluminium oxide Al2O3 27.0-31.0; magnesium oxide MgO 12.0-16.0; boron oxide B2O3 2.0-7.0.
Description
CERAMIC MATERIAL
The present invention relates to the field of ceramic materials capable of generating infrared (LR) radiation with specified wavelengths. More particularly, it relates to ceramic materials with enhanced thermal, chemical and physical stability which can be used in highly efficient heaters and emitters for various applications in such areas as: medicine, for treating diseases; the food industry, for processing and preparing foodstuffs; in the light industry (textiles); and in manufacturing lining mate- rials.
The most similar prototype, from a technical point of view, is the ceramic material described in US Patent # 5,472,720, which contains the following ingredients, wt%: silicon dioxide SiO2 10.0-28.0 iirroonn ooxxiiddee F Fee22OO33 15.0-35.0 calcium oxide CaO up to 15.0 aluminium oxide Al2O3 up to 3.5 magnesium oxide MgO up to 3.0 copper oxide CuO up to 2.0 cchhrroommiiuumm ooxxiiddee C Crr22OO3 the rest
This composition is used as a converting material to obtain IR radiation with stable properties. The above ceramic material absorbs either pulse IR radiation from another ceramic material capable of generating only pulse IR radiation, or radiation from lamps, heating coils, etc, and generates continuous IR radiation at a wave- length of 16 microns (μ).
A shortcoming of the material is that it is impossible to obtain stable IR radiation with a wavelength within 9-10 microns (μ).
The object of the proposed invention is to create a ceramic material with controlled properties capable of generating stable secondary IR radiation with a wavelength within 9-10 microns (μ).
The goal is achieved by supplementing a material containing silicon dioxide SiO2, aluminium oxide Al2O3, and magnesium oxide MgO by boron oxide B2O3, in the following proportions of ingredients, wt%: silicon dioxide SiO2 50.0-55.0 aluminium oxide Al2O3 27.0-31.0 magnesium oxide MgO 12.0-16.0 boron oxide B2O3 2.0 - 7.0
Conducted research has shown that precisely these proportions, with the addition of B2O3, produce a ceramic material capable of generating continuous secondary IR radiation with a wavelength within 9-10 microns (μ).
The proposed ceramic material is prepared following conventional procedure.
The ingredients are ground in a planetary mill using Plexiglas drums and Teflon balls until a fine powder is obtained. After being dried, the powder is put in a crucible of a solar furnace, where it is melted. The melting is usually done in conditions reducing the loss of the oxygen from the obtained powder, preferably in oxi- dative atmospheres, best of all in air. Generally, these ceramic compositions on the basis of silicon dioxide are melted at a temperature of about 1,900°C. The melt drips into a cooling tank filled with water. Thus is the proposed ceramic material •obtained.
To produce items or specimens of the ceramic material the obtained body is ground, pressed into an item of the desired shape, and sintered at a temperature of 1,600°C.
Likewise, to use the ceramic material as an emitter of secondary IR radiation, the following method can be utilised: the obtained body is ground, mixed with a binder
based on polyvinyl alcohol or soluble glass, and applied to the surface of the heating elements that are the source of primary IR radiation, or that of other articles to be used as sources of secondary IR radiation.
Given below are examples of preparing the ceramic material according to the pres- ent invention.
Example 1.
A charge was prepared of the following composition, wt%: silicon oxide SiO2 50.0 aluminium oxide Al2O3 29.0 magnesium oxide MgO 14.0 boron oxide B2O3 7.0
The charge was then mixed in a planetary mill using Plexiglas drums and Teflon balls until a fine powder was obtained. The powder was put in a crucible of a solar furnace and melted at 1,900°C in air. The melt was dripped into a cooling tank filled with water. Thus was the ceramic material obtained.
To conduct tests the material was ground once again in the manner described above and sifted through a sieve with meshes of 40 microns (μ). To the ground powder was then added a binder based on soluble glass. The resulting mixture was applied with a paintbrush to the surface of a 100 watt (W) incandescent lamp and dried.
Then the tests were conducted: the voltage was supplied to the incandescent lamps and the wavelength of the IR radiation was measured by means of a IR spectro- photometer.
In examples 2 to 4 specimens of the ceramic material were obtained in the same way as set out in example 1, except that the percentages of the ingredients were
changed. For ease of description the compositions of all the examples are listed in Table 1.
It should be pointed out that only within the range of the above proportions was it possible to obtain a ceramic material with controlled properties, capable of generating stable secondary IR radiation with a wavelength within 9-10 microns (μ).
Table 1
Ingredient, wt% Example 1 Example 2 Example 3 Example 4 silicon dioxide SiO- > 50 52 52 55 aluminium oxide Al2O3 29 29 31 29 magnesium oxide
MgO 14 14 14 14 boron oxide B2O3 7 5 3 2
Wavelength of the IR radiation, 9.0-9.5 9.0-10.0 9.5-10.0 9.7-10.0 maximum radiation, microns (μ)
The data given graphically reveal the properties of the new ceramic material.
It can also be seen that Example 2 has the optimum composition which ensures the desired properties of IR radiation within 9-10 microns (μ). The compositions in
Examples 1, 3 and 4 ensure the desired properties too.
Going beyond the percentage range of the proposed ingredients of the new ceramic material in either direction results in a complete loss of the effect.
Although only four examples are given of percentages of the new ceramic material, so as not to clutter the description with a multitude of tables, the proposed invention covers all combinations of the ingredients within the given percentage range.
Claims
CLAIM
A ceramic material containing silicon dioxide (SiO2), aluminium oxide (Al2O3), and magnesium oxide (MgO), whose distinguishing feature is that it also contains boron oxide (B2O3), in the following proportion of ingredients, wt%:
SiO2 50.0-55.0
Al2O3 27.0-31.0
MgO 12.0-16.0
B2O3 2.0- 7.0.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU16798/99A AU1679899A (en) | 1998-01-20 | 1999-01-11 | Ceramic material |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| UZ9800040 | 1998-01-20 | ||
| UZIHDP9800040.1 | 1998-01-20 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO1999036373A1 true WO1999036373A1 (en) | 1999-07-22 |
Family
ID=25546923
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/IB1999/000023 Ceased WO1999036373A1 (en) | 1998-01-20 | 1999-01-11 | Ceramic material |
Country Status (2)
| Country | Link |
|---|---|
| AU (1) | AU1679899A (en) |
| WO (1) | WO1999036373A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1329431A1 (en) * | 2002-01-21 | 2003-07-23 | Sang-Ho Son | Far-infrared ray radiator and method for manufacturing the same |
| KR100543886B1 (en) * | 2005-05-27 | 2006-01-23 | 반석제로파 주식회사 | Far-infrared infrared ceramic granule powder and manufacturing method of high density physiotherapy stone using same |
| RU2397196C2 (en) * | 2008-04-09 | 2010-08-20 | Институт электрофизики Уральского отделения Российской академии наук | Method of producing composite ceramic material (versions) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0168189A2 (en) * | 1984-07-02 | 1986-01-15 | Corning Glass Works | Transparent, mullite-containing glass-ceramics |
| US4897509A (en) * | 1987-04-27 | 1990-01-30 | Corning Incorporated | Glass-ceramics for electronic packaging |
-
1999
- 1999-01-11 WO PCT/IB1999/000023 patent/WO1999036373A1/en not_active Ceased
- 1999-01-11 AU AU16798/99A patent/AU1679899A/en not_active Abandoned
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0168189A2 (en) * | 1984-07-02 | 1986-01-15 | Corning Glass Works | Transparent, mullite-containing glass-ceramics |
| US4897509A (en) * | 1987-04-27 | 1990-01-30 | Corning Incorporated | Glass-ceramics for electronic packaging |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1329431A1 (en) * | 2002-01-21 | 2003-07-23 | Sang-Ho Son | Far-infrared ray radiator and method for manufacturing the same |
| KR100543886B1 (en) * | 2005-05-27 | 2006-01-23 | 반석제로파 주식회사 | Far-infrared infrared ceramic granule powder and manufacturing method of high density physiotherapy stone using same |
| RU2397196C2 (en) * | 2008-04-09 | 2010-08-20 | Институт электрофизики Уральского отделения Российской академии наук | Method of producing composite ceramic material (versions) |
Also Published As
| Publication number | Publication date |
|---|---|
| AU1679899A (en) | 1999-08-02 |
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