CN111578711A - High-temperature creep furnace for metal creep test - Google Patents

Abstract

The invention is a high-temperature creep furnace for metal durable creep test. Control meter, wiring aluminum bar and wiring shield; the high temperature creep furnace can provide a test temperature range of 800 to 1600 degrees Celsius; the main body of the high temperature creep furnace is installed on the main frame rail of the testing machine, and can slide up and down along the rail , the clamps for clamping the samples enter the furnace body through the openings reserved at the upper and lower ends of the furnace body; when using a high-temperature creep furnace, first move the furnace body up so that the upper and lower clamps are placed outside the furnace, then clamp the samples and select A corresponding number of thermocouples are tied within the gauge length of the sample. Finally, the furnace body is moved down to place the sample in the center of the furnace. The wires are connected through the aluminum wire and heated by electricity. During the test, the temperature in the furnace can be monitored in real time through the temperature control meter. and regulation.

Description

A high temperature creep furnace for metal permanent creep test

technical field

The invention is a high-temperature creep furnace for metal durable creep test, belongs to the technical field of material mechanical property testing, and can be applied to the fields of new materials and new technologies such as semiconductor, aerospace, microelectronics, nanotechnology, carbon fiber, etc. The laboratories of institutions of higher learning and scientific research institutes provide high-temperature test environments for permanent creep tests of metals.

Background technique

Metal materials will produce creep phenomenon under the action of certain temperature and stress. As new engines have higher and higher operating temperature requirements for high-temperature metal materials, the creep phenomenon of materials can not be ignored. Research the creep phenomenon of materials It is of great significance for the design of boilers, internal combustion engines, gas turbines, nuclear reactors and other devices that need to work at high temperatures for a long time. To carry out the permanent creep test of metal materials, it is necessary to rely on the heating device to provide the sample with a stable high temperature environment for a long time. The development of a new generation of high-temperature creep furnaces with high reliability and high heating performance can provide help for the in-depth exploration of permanent creep test work.

SUMMARY OF THE INVENTION

The present invention is designed to provide a high-temperature creep furnace for metal permanent creep test, aiming at providing a heating capacity of 800 to 1600 degrees Celsius for the sample.

In order to solve this technical problem, the technical scheme of the present invention is:

This kind of high temperature creep furnace for metal permanent creep test includes furnace body stainless steel-cold-rolled plate double-layer shell 1, furnace ceramic fiber thermal insulation layer 2, molybdenum disilicide alloy heating element 3, thermocouple temperature control Table 4, wiring aluminum row 5 and wiring protective cover 6, of which:

The furnace ceramic fiber thermal insulation layer 2 is fixedly lined on the inner side of the stainless steel-cold-rolled plate double-layer casing 1 of the furnace body, and the molybdenum disilicide alloy heating element 3 is strip-shaped, along the furnace ceramic fiber thermal insulation layer 2 The inner circumference is evenly distributed, and a gap is maintained with the inner surface of the ceramic fiber thermal insulation layer 2 of the furnace to form a heating zone toward the center of the furnace.

In one implementation, the molybdenum disilicide alloy heating elements 3 are U-shaped, four are evenly distributed along the inner circumference of the furnace ceramic fiber thermal insulation layer 2, and the ends thereof pass upward through the furnace ceramic fiber thermal insulation layer 2 and the external wires The wiring aluminum row 5 is connected to provide power for the molybdenum disilicide alloy heating element 3.

The power of a single group of four groups of molybdenum disilicide alloy heating elements 3 is 1.8 kilowatts, and the total heating power is 7.2 kilowatts. Since the molybdenum disilicide alloy heating elements 3 have dual characteristics of metal and ceramics, they can withstand high temperatures of 2030 degrees Celsius and can be heated at 1800 degrees Celsius. It has oxidation resistance under the condition of degrees Celsius, and is made by sintering uniform and impurity-free molybdenum disilicide alloy particles. The silicon dioxide passivation layer formed on the surface of the molybdenum disilicide alloy heating element 3 at high temperature has the effect of preventing further oxidation; the heating element adopts Two parallel and one series connection mode, the heating process is smooth and fast;

Further, the spacing between the heating rods of the U-shaped molybdenum disilicide alloy heating element 3 is 50 mm, and the length of the heating section of the heating rod of the U-shaped molybdenum disilicide alloy heating element 3 is 400 mm.

In one implementation, the thermocouple type temperature control meter 4 is installed on the middle side of the stainless steel-cold-rolled plate double-layer casing 1 of the furnace body, and its main body part passes through the stainless steel-cold-rolled plate double-layer casing of the furnace body 1 and the furnace ceramic fiber thermal insulation layer 2 reach the inside of the furnace, and are connected to the thermocouple bound to the sample, for measuring the temperature of the sample at the center of the furnace.

In one implementation, the furnace body stainless steel-cold-rolled plate double-layer casing 1 is a cylinder with a fixed part that can be connected with the main frame rail of the testing machine. The casing is made of 304 stainless steel and adopts a mesh structure. In order to prevent the surface temperature of the furnace body from being too high, the inner shell is made of cold-rolled sheets to prevent the temperature loss in the furnace and control the uniformity of the furnace temperature.

In one implementation, the upper and lower ends of the furnace ceramic fiber thermal insulation layer 2 are provided with circular openings for the sample and the fixture to pass through, and the furnace ceramic fiber thermal insulation layer 2 adopts vacuum oxidation with a dense structure. Aluminum ceramic fiber is made by one-time hot pressing.

In one implementation, the inner cavity of the furnace surrounded by the furnace ceramic fiber thermal insulation layer 2 has a diameter of 170 mm and a height of 400 mm, and the strip-shaped molybdenum disilicide alloy heating element 3 is located at the center of the furnace with an average temperature of 200 mm in length. The outer diameter of the zone is 9±0.1mm, the outer diameter of the strip-shaped molybdenum disilicide alloy heating element 3 above the part of the uniform temperature zone is 9.5mm, and the outer diameter of the strip-shaped molybdenum disilicide alloy heating element 3 below the part of the uniform temperature zone The diameter is 8.5mm. The furnace structure adopts a stepped design and is divided into three areas. The temperature of the lower high temperature area is slightly higher than that of the working area, the middle heating area is the working temperature area of the furnace cavity, and the temperature of the upper low temperature area is slightly lower than that of the working area. Complementary to ensure a temperature gradient of 200 mm uniform temperature area;

In one implementation, the side surface of the wiring protection cover 6 is provided with a square opening through which external wires pass.

In one implementation, the thermocouple-type temperature control meter 4 uses a B-type double platinum-rhodium metal sheet as the temperature measuring element.

In practice, the high temperature creep furnace can provide a test temperature range of 800 to 1600 degrees Celsius, a temperature gradient of 4 degrees from 300 to 1200 degrees, a temperature gradient of 1% above 1200 degrees, and a crease rate of 5 to 20 degrees per minute. .

The beneficial effects of the technical solution of the present invention are:

The high-temperature creep furnace can be properly matched with the existing durability testing machine in terms of overall size and structure, and can provide the sample with a heating capacity of up to 1600 degrees Celsius, so that it can carry out the durability of metal materials under the condition of 800 to 1600 degrees Celsius. Creep test work has a wide range of application prospects in the field of material mechanical properties testing technology.

Description of drawings

Fig. 1 is the overall structure schematic diagram of the high temperature creep furnace of the present invention;

Fig. 2 is the control panel schematic diagram of the thermocouple type temperature control meter 4 of the present invention;

Fig. 3 is the schematic diagram of the U-shaped molybdenum disilicide alloy heating element of the present invention;

Detailed ways

The technical scheme of the present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments:

As shown in Figure 1, the high-temperature creep furnace of this embodiment includes a stainless steel-cold-rolled plate double-layer shell 1 for the furnace body, a ceramic fiber thermal insulation layer 2 for the furnace, a molybdenum disilicide alloy heating element 3, and a thermocouple temperature control Table 4. Wiring aluminum row 5 and 6. Wiring protective cover. Among them, the furnace thermal insulation layer 2 is fixedly lined inside the stainless steel-cold-rolled plate double-layer shell 1 of the furnace body, the end of the molybdenum disilicide alloy heating element 3 is installed on the top of the furnace, and the external wires can pass through the wiring shield 6. The opening is connected to the wiring aluminum row 5 to provide power for the molybdenum disilicide alloy heating element 3, and the main part of the molybdenum disilicide alloy heating element 3 is installed inside the furnace through the furnace ceramic fiber thermal insulation layer 2; thermocouple temperature control Table 4 is installed on the middle side of the high-temperature creep furnace, and its main part passes through the stainless steel-cold-rolled plate double-layer shell 1 of the furnace body and the furnace ceramic fiber thermal insulation layer 2 to the inside of the furnace, and is bound to the sample. The thermocouple is connected; the stainless steel-cold-rolled plate double-layer casing 1 of the furnace body is a cylinder with fixed parts that can be connected with the main frame track of the testing machine. The shell is designed as a stainless steel-cold-rolled plate double-layer structure. The outer shell is made of 304 stainless steel, and the mesh structure is adopted to prevent the surface temperature of the furnace body from being too high. The inner shell is made of cold-rolled plate to prevent the temperature loss in the furnace and control the uniformity of the furnace temperature; the molybdenum disilicide alloy heating element 3 adopts U-shaped Structure, the span on both sides is 50 mm, the total length of the heating section on both sides of each group of heating elements is 400 mm, the heating section adopts a stepped structure, the outer diameter of the middle 200 mm temperature-averaging area is 9±0.1 mm, and the upper part is 100 mm. The outer diameter of the part is 9.5 mm, the outer diameter of the bottom 100 mm part is 8.5 mm, the total length of the cold end part at the bottom of the heating element is 225 mm, and the four groups of heating elements are evenly distributed on the inside of the furnace along the circumferential distribution pattern; the furnace ceramic fiber heat insulation The upper and lower ends of layer 2 are left with circular openings for the samples and fixtures to pass through. mm, the height is 400 mm, and the furnace structure adopts a stepped design, which is divided into three regions with a lower high temperature zone, a middle heating zone and an upper low temperature zone, which can form complementary temperature regions to ensure the temperature gradient of the 200 mm uniform temperature zone; wiring protection cover There are square openings on the side of 6 for external wires to pass through; thermocouple temperature control meter 4 adopts B-type double platinum-rhodium metal sheet as the temperature measuring element.

The high temperature creep furnace of this example can be properly matched with the existing durability testing machine in terms of dimensions and structure. Its main body is installed on the main frame track of the testing machine, and can slide up and down along the track. The fixture enters the furnace body through the reserved openings at the upper and lower ends of the furnace body; when using a high-temperature creep furnace, first move the furnace body upwards so that the upper and lower fixtures are placed outside the furnace body, then clamp the sample and select the corresponding number of thermocouples to bind Within the range of the gauge length of the sample, the furnace body is finally moved down to place the sample in the center of the furnace and heated by electricity. During the test, the temperature in the furnace can be monitored and adjusted in real time through the temperature control meter. The high-temperature creep furnace in this example can provide the sample with a heating capacity of up to 1600 degrees Celsius, so that it can carry out the permanent creep test of metal materials under the conditions of 800 to 1600 degrees Celsius.

Claims (10)

1. a high-temperature creep furnace for metal lasting creep test, is characterized in that: this high-temperature creep furnace comprises furnace body stainless steel-cold-rolled plate double-layer shell (1), furnace ceramic fiber thermal insulation layer (1). 2), molybdenum disilicide alloy heating element (3), thermocouple temperature control meter (4), wiring aluminum row (5) and wiring protective cover (6), of which: The furnace ceramic fiber thermal insulation layer (2) is fixedly lined on the inner side of the stainless steel-cold-rolled plate double-layer casing (1) of the furnace body. The inner circumference of the fiber thermal insulation layer (2) is evenly distributed, and a gap is maintained with the inner surface of the ceramic fiber thermal insulation layer (2) of the furnace to form a heating area toward the center of the furnace. 2. The high-temperature creep furnace for metal permanent creep test according to claim 1, characterized in that: the molybdenum disilicide alloy heating element (3) is U-shaped, and the ceramic fiber thermal insulation layer (2) is formed along the furnace chamber. Four are evenly distributed on the inner circumference, and the ends thereof pass upward through the furnace ceramic fiber thermal insulation layer (2) and are connected to the wiring aluminum row (5) of the external wire to provide power for the molybdenum disilicide alloy heating element (3). 3. The high-temperature creep furnace for metal permanent creep test according to claim 2, characterized in that: the spacing between the heating rods of the U-shaped molybdenum disilicide alloy heating element (3) is 50 mm, and U The length of the heating section of the heating rod of the type molybdenum disilicide alloy heating element (3) is 400 mm. 4. The high-temperature creep furnace for metal permanent creep test according to claim 1, characterized in that: the thermocouple type temperature control meter (4) is installed in the furnace stainless steel-cold-rolled plate double-layer casing (1) The middle side is used to measure the temperature of the sample at the center of the furnace. 5. The high-temperature creep furnace for metal permanent creep test according to claim 1, characterized in that: the stainless steel-cold-rolled plate double-layer shell (1) of the furnace body is a cylinder with a The fixed part connected to the main frame track of the testing machine. The outer shell is made of 304 stainless steel. The mesh structure is adopted to prevent the surface temperature of the furnace body from being too high. The inner shell is made of cold-rolled plate to prevent the temperature loss in the furnace and control the uniformity of the furnace temperature sex. 6. The high-temperature creep furnace for metal permanent creep test according to claim 1, wherein the upper and lower ends of the furnace ceramic fiber thermal insulation layer (2) are provided with available samples and clamps Through the circular opening, the furnace ceramic fiber thermal insulation layer (2) is made by one-time hot pressing molding of vacuum alumina ceramic fiber with dense structure. 7. The high-temperature creep furnace for metal permanent creep test according to claim 1 or 2, characterized in that: the diameter of the inner chamber of the furnace surrounded by the furnace ceramic fiber thermal insulation layer (2) is 170 mm, and the height is 170 mm. 400mm, the outer diameter of the strip-shaped molybdenum disilicide alloy heating element (3) located at the center of the furnace with a length of 200 mm is 9±0.1mm, and the strip-shaped molybdenum disilicide alloy above the part of the uniform temperature zone is heated The outer diameter of the element (3) is 9.5 mm, and the outer diameter of the strip-shaped molybdenum disilicide alloy heating element (3) below the temperature equalization zone is 8.5 mm. 8 . The high-temperature creep furnace for permanent metal creep test according to claim 1 , wherein the side surface of the wiring shield ( 6 ) is provided with a square opening through which external wires pass. 9 . 9. The high-temperature creep furnace for metal permanent creep test according to claim 1 or 4, characterized in that: the thermocouple type temperature control meter (4) adopts B-type double platinum-rhodium metal sheet as temperature measurement element. 10 . The high-temperature creep furnace for metal permanent creep test according to claim 7 , wherein the test temperature range provided by the high-temperature creep furnace is 800 to 1600 degrees Celsius, and the temperature gradient from 300 to 1200 degrees is 10 . 10 . 4 degrees, a temperature gradient of 1% above 1200 degrees, and a crease rate of 5 to 20 degrees per minute.

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