Comprehensive testing device for thermophysical properties of ceramic materials

Abstract

The application discloses a comprehensive testing device for the thermophysical properties of ceramic materials, and aims to improve the accuracy of the testing device for the thermophysical properties of ceramic materials.The comprehensive testing device for the thermophysical properties of ceramic materials comprises an insulation box, a testing box, a top testing device, an in-box testing device and a cooling and atmosphere control device, the testing box is arranged in the insulation box, uniform temperature plates are arranged on the left and right box walls and the bottom box wall of the testing box, heating rods are arranged on the outer plate surfaces of the uniform temperature plates, the top testing device is arranged on the top of the testing box, the top testing device comprises two laser scanning range finders, heat insulation glass, a thermal radiation tester and a cooling cavity, and the cooling and atmosphere control device is arranged on the outer box wall of the insulation box.The application adopts a more accurate infrared laser scanning range finding method to test the thermal expansion coefficient, and the thermal radiation intensity of the ceramic material is tested during the testing process, so that the heat insulation performance of the ceramic material during service is evaluated.

Description

Technical Field

[0001] This invention belongs to the technical field of ceramic material thermophysical property testing equipment, specifically involving an integrated ceramic material thermophysical property testing device, the tested thermophysical properties including thermal expansion coefficient and thermal insulation performance. Background Technology

[0002] Ceramic materials are widely used in shipbuilding, aerospace, civil engineering and other fields due to their excellent thermophysical properties. In the actual engineering application process, it is usually necessary to quickly and accurately determine the thermophysical parameters of ceramic materials. Among them, the most critical parameters are the coefficient of thermal expansion and thermal insulation performance, which usually directly affect the application of various ceramic materials in engineering.

[0003] Currently, the main methods for obtaining the coefficient of thermal expansion and thermal insulation performance of ceramic materials are theoretical calculations and experimental measurements. However, theoretical calculations are not widely adopted due to the large number of variables considered, the complexity of the calculation process, and the significant limitations in application. Experimental measurements are usually the primary method for obtaining the thermophysical properties of ceramic materials; however, most testing methods are lengthy, the results are not precise enough, and they cannot directly and quickly obtain data on the coefficient of thermal expansion and thermal insulation performance of ceramic materials. Therefore, designing and developing a comprehensive performance testing device is of great significance, addressing the core need for rapid and accurate measurement of the key thermophysical properties of ceramic materials. Summary of the Invention

[0004] To address the issues of insufficient accuracy and long testing cycles in existing methods for testing the thermophysical properties of ceramic materials, this invention provides a comprehensive testing device for the thermophysical properties of ceramic materials.

[0005] The comprehensive testing device for the thermophysical properties of ceramic materials of the present invention includes an insulated box, a test chamber, a top testing device, an internal testing device, and a cooling and atmosphere control device. The insulated box is provided with a door, and the walls of the insulated box are provided with a heat insulation layer. Cooling pipes are embedded in the heat insulation layer. The test chamber is built inside the insulated box. The top wall of the test chamber is provided with a heat insulation layer. The left, right and bottom walls of the test chamber are provided with heat distribution plates, and heating rods are provided on the outer surface of each heat distribution plate.

[0006] A top testing device is installed on the top of the test chamber. The top testing device includes two (rotating) laser scanning rangefinders, heat-insulating glass, a thermal radiation tester, and a cooling chamber shell. The heat-insulating glass is installed on the top of the test chamber. The two laser infrared scanning rangefinders and the thermal radiation tester are installed on the heat-insulating glass. The cooling chamber shell covers the outside of the two laser scanning rangefinders and the thermal radiation tester.

[0007] Multiple in-chamber testing devices are installed inside the test chamber. Each in-chamber testing device consists of a (total radiation + convection) radiometer and a temperature sensor.

[0008] The cooling and atmosphere control device includes an atmosphere control box, a cooling control box, a first connecting pipe, and a second connecting pipe. The atmosphere control box and the cooling control box are installed on the outer wall of the insulation box. The atmosphere control box contains an atmosphere cylinder, and the cooling control box contains coolant. One end of the first connecting pipe is connected to the atmosphere cylinder, and the other end of the first connecting pipe is connected to the test box. One end of the second connecting pipe is connected to the outlet of the cooling control box, and the other end of the second connecting pipe is connected to the inlet of the cooling pipe assembly and the cooling chamber shell, respectively. The outlets of the cooling pipe assembly and the cooling chamber shell are connected to the return port of the cooling control box through a third connecting pipe.

[0009] The design of this invention, a comprehensive thermophysical property testing device for ceramic materials, is both rational and ensures the accuracy of the test results. This device primarily tests the coefficient of thermal expansion and thermal insulation performance of ceramic materials under high-temperature environments, thereby determining the application areas of ceramic materials in engineering.

[0010] This invention employs a more accurate infrared laser scanning ranging method to test the coefficient of thermal expansion. Simultaneously, the thermal radiation intensity of the ceramic material is measured during the test, thereby evaluating the thermal insulation performance of the ceramic material during service. The testing process utilizes a more precise method, simultaneously acquiring the coefficient of thermal expansion and thermal insulation performance of the ceramic material, thus improving the accuracy of the experimental data. The results can directly predict the service life and thermal insulation performance of the ceramic material, significantly shortening the experimental testing phase of thermal protective coatings and improving experimental efficiency. Attached Figure Description

[0011] Figure 1 This is a top view of the comprehensive testing device for the thermophysical properties of ceramic materials according to the present invention;

[0012] Figure 2 This is a front view of the comprehensive testing device for the thermophysical properties of ceramic materials according to the present invention;

[0013] Figure 3 This is a schematic diagram of the internal structure of the test chamber of this invention;

[0014] Figure 4 This is a schematic diagram of the top laser infrared testing device of the comprehensive testing device for the thermophysical properties of ceramic materials of the present invention;

[0015] Figure 5 This is a schematic diagram of the thermal radiation tester in the comprehensive testing device for the thermophysical properties of ceramic materials of the present invention;

[0016] Figure 6 This is a schematic diagram of the internal testing device in the comprehensive testing device for the thermophysical properties of ceramic materials of the present invention;

[0017] In the diagram: 100—Base, 101—Level, 102—Adjustable feet, 200—Control panel, 300—Insulated box, 301—Box door, 302—Insulation layer, 303—Cooling pipe assembly, 400—Test chamber, 401—Heating rod, 402—Heat distribution plate, 403—Insulation layer, 404—Cooling chamber shell, 405—Vacuum valve, 406—(Rotating) laser scanning rangefinder, 407—Insulated glass, 408— Thermal radiation tester, 409—total (infrared + visible) radiometer, 410—infrared thermometer, 412—indoor radiation testing device, 413—total (total radiation + convection) radiometer, 414—temperature sensor, 416—rotating shaft, 500—cooling and atmosphere control device, 501—atmosphere control box, 502—cooling control box, 503—first connecting pipe, 504—second connecting pipe, 505—third connecting pipe. Detailed Implementation

[0018] Specific Implementation Method 1: The comprehensive testing device for the thermophysical properties of ceramic materials in this embodiment includes an insulation box 300, a testing box 400, a top testing device, an internal testing device 412, and a cooling and atmosphere control device 500. The insulation box 300 is provided with a door 301, and the insulation box 300 is provided with a heat insulation layer 302 on its walls. A cooling pipe assembly 303 is embedded in the heat insulation layer 302. The testing box 400 is built inside the insulation box 300. The top wall of the testing box 400 is provided with a heat insulation layer 403, and the left, right, and bottom walls of the testing box 400 are provided with heat spreaders 402. Each heat spreader 402 has a heating rod 401 on its outer surface.

[0019] A top testing device is provided on the top of the test chamber 400. The top testing device includes two (rotary) laser scanning rangefinders 406, heat-insulating glass 407, thermal radiation tester 408, and cooling chamber shell 404. The heat-insulating glass 407 is located on the top of the test chamber 400. The two laser infrared scanning rangefinders 406 and the thermal radiation tester 408 are located on the heat-insulating glass 407. The cooling chamber shell 404 covers the outside of the two laser scanning rangefinders 406 and the thermal radiation tester 408.

[0020] Multiple in-chamber testing devices 412 are installed inside the test chamber 400. Each in-chamber testing device 412 consists of a (total radiation + convection) radiometer 413 and a temperature sensor 414.

[0021] The cooling and atmosphere control device 500 includes an atmosphere control box 501, a cooling control box 502, a first connecting pipe 503, and a second connecting pipe 504. The atmosphere control box 501 and the cooling control box 502 are installed on the outer wall of the insulation box 300. The atmosphere control box 501 contains an atmosphere cylinder, and the cooling control box 502 contains coolant. One end of the first connecting pipe 503 is connected to the atmosphere cylinder, and the other end of the first connecting pipe 503 is connected to the test box 400. One end of the second connecting pipe 504 is connected to the outlet of the cooling control box 502, and the other end of the second connecting pipe 504 is connected to the inlet of the cooling pipe assembly 303 and the cooling chamber shell 404, respectively. The outlets of the cooling pipe assembly 303 and the cooling chamber shell 404 are connected to the return port of the cooling control box 502 through a third connecting pipe 505.

[0022] This embodiment of the ceramic material thermophysical property comprehensive testing device combines the testing of the thermal expansion coefficient and the thermal insulation performance of ceramic materials. It makes full use of the time during the heat preservation and cooling stages to test the thermophysical properties of ceramic materials, thereby obtaining the comprehensive thermal properties of ceramic materials.

[0023] In this embodiment, the heating is controlled by a heating rod and the cooling is controlled by a cooling control box. During the heating and cooling processes, the coefficient of thermal expansion and thermal radiation performance of the sample are tested simultaneously, and the test results are more accurate.

[0024] Specific Implementation Method Two: The difference between this implementation method and Specific Implementation Method One is that the door 301 is hinged to the insulated box 300.

[0025] Specific Implementation Method 3: This implementation method differs from Specific Implementation Method 1 or 2 in that a sample stage is provided inside the test chamber 400.

[0026] Specific Implementation Method Four: This implementation method differs from Specific Implementation Methods One to Three in that the thermal radiation tester 408 is located between two laser infrared scanning rangefinders 406.

[0027] Specific Implementation Method 5: This implementation method differs from Specific Implementation Methods 1 to 4 in that the thermal radiation tester 408 is composed of a total (infrared + visible) radiometer 409 and an infrared thermometer 410.

[0028] Specific Implementation Method Six: This implementation method differs from Specific Implementation Methods One to Five in that a vacuum valve 405 is installed on the top wall of the test chamber 400.

[0029] In this embodiment, the insulated box can be vacuumed using the vacuum valve 405.

[0030] Specific Implementation Method Seven: This implementation method differs from Specific Implementation Methods One to Six in that the heating rods 401 are arranged in a serpentine (S-shaped) or parallel intervals.

[0031] Specific Implementation Method Eight: This implementation method differs from Specific Implementation Methods One to Seven in that the insulated box 300 is placed on the base 100.

[0032] Specific Implementation Method Nine: This implementation method differs from Specific Implementation Methods One to Eight in that a circulation pump is provided on the third connecting pipe 505.

[0033] Specific Implementation Method 10: This implementation method differs from Specific Implementation Methods 1 to 9 in that the atmosphere cylinder is filled with liquid nitrogen or liquid helium.

[0034] Example: The comprehensive testing device for the thermophysical properties of ceramic materials in this example includes an insulated box 300, a test chamber 400, a top testing device, an internal testing device 412, and a cooling and atmosphere control device 500. The insulated box 300 is provided with a door 301, and the inner wall of the insulated box 300 is provided with a heat insulation layer 302. A cooling pipe assembly 303 is embedded in the heat insulation layer 302. The test chamber 400 is built inside the insulated box 300. The top wall of the test chamber 400 is provided with a heat insulation layer 403. The left, right and bottom walls of the test chamber 400 are provided with heat spreaders 402. A heating rod 401 is provided on the outer surface of each heat spreader 402. The sample 600 is placed inside the test chamber 400.

[0035] A top testing device is provided on the top of the test chamber 400. The top testing device includes two laser scanning rangefinders 406, heat-insulating glass 407, thermal radiation tester 408, and cooling chamber shell 404. The heat-insulating glass 407 is set on the top of the test chamber 400. The two laser scanning rangefinders 406 and the thermal radiation tester 408 are set on the heat-insulating glass 407. The thermal radiation tester 408 is located between the two laser infrared scanning rangefinders 406. The laser scanning rangefinders 406 can be driven to rotate by the rotating shaft 416. The cooling chamber shell 404 covers the outside of the two laser scanning rangefinders 406 and the thermal radiation tester 408. The laser scanning rangefinders 406 perform three-dimensional scanning of the sample 600 to obtain the three-dimensional morphology and size of the sample 600. After a series of heating and heat preservation processes, the three-dimensional morphology of the sample 600 is scanned again. The results are used by computer to calculate the volume thermal expansion coefficient of the sample 600.

[0036] Multiple in-chamber testing devices 412 are installed inside the test chamber 400. Each in-chamber testing device 412 consists of a (total radiation + convection) radiometer 413 and a temperature sensor 414.

[0037] The cooling and atmosphere control device 500 includes an atmosphere control box 501, a cooling control box 502, a first connecting pipe 503, and a second connecting pipe 504. The atmosphere control box 501 contains an atmosphere cylinder, and the cooling control box 502 contains coolant. The cooling control box 502 has heat sinks on its walls and can also be equipped with a fan for cooling. One end of the first connecting pipe 503 is connected to the atmosphere cylinder, and the other end of the first connecting pipe 503 is connected to the test chamber 400. One end of the second connecting pipe 504 is connected to the outlet of the cooling control box 502, and the other end of the second connecting pipe 504 is connected to the inlet of the cooling pipe assembly 303 and the cooling chamber shell 404, respectively. The outlets of the cooling pipe assembly 303 and the cooling chamber shell 404 are connected to the return port of the cooling control box 502 through a third connecting pipe 505.

[0038] The control console 200 and the insulation box 300 are placed on the base 100. The level 101 is installed on the base 100. The base 100 is equipped with adjustable feet 102. Adjusting the feet makes the insulation box 300 level.

[0039] In this embodiment, the thermal radiation tester 408 consists of a total (infrared + visible) radiometer 409 and an infrared thermometer 410. The total (infrared + visible) radiometer 409 collects and calculates the infrared intensity of the sample 600. The infrared thermometer 410 is used to detect the temperature of the sample 600.

[0040] The thermal radiation testing apparatus is divided into a top thermal radiation testing device 408 and an internal thermal radiation testing device 412, which respectively test the thermal radiation performance of the sample 600 and the thermal radiation generated by the internal temperature distribution plate 402. Each thermal radiation testing instrument is also equipped with a cooling device and high-temperature insulated glass to ensure safe operation in high-temperature environments.

[0041] In this embodiment, the rotating laser infrared scanning rangefinder 406 scans the morphology of the sample 600 after it has been kept at a certain temperature for a certain period of time. The computer calculates the dimensional changes of the sample 600 at the test temperature and obtains the coefficient of thermal expansion. The sample 600 is a cylinder with a height not exceeding 12 mm and a diameter not exceeding 80 mm, or a cube with a side length not exceeding 80 mm.

[0042] In this embodiment, the thermal insulation performance test results are obtained by simultaneously testing the sample 600 and the temperature equalization plate 402 during the heating and insulation process inside the box using the top thermal radiation testing device and the box internal testing device. The computer then performs error calculation on the two test results to obtain the thermal insulation performance of the sample 600.

[0043] The experimental method using the comprehensive thermophysical property testing device for ceramic materials described in this embodiment is implemented according to the following steps:

[0044] S1. Adjust the equipment to a horizontal position and turn it on;

[0045] S2. Place the sample in the test chamber and use an atmosphere control box to keep the test chamber in an inert atmosphere;

[0046] S3. Set the test temperature and the test temperature holding time, and perform the first dimensional scan of the sample at room temperature;

[0047] S4. Simultaneously with the start of heating, activate the cooling control device to cool and protect the testing device and the outer shell of the insulation chamber.

[0048] S5. During the heating process, the internal thermal radiation testing device remains powered on to monitor the internal temperature and the intensity of internal thermal radiation.

[0049] S6. Heat to the test temperature and start testing the thermal radiation performance of the sample until the holding time ends. Obtain the thermal radiation intensity of the sample at the test temperature. At the same time, perform a second dimensional scan of the sample at the test temperature to obtain the coefficient of thermal expansion of the sample at the test temperature.

[0050] S7. After the test is completed, keep the cooling system on until it cools to room temperature, adjust the atmosphere inside the chamber, and then turn off the machine.

Claims

1. A comprehensive testing device for the thermophysical properties of ceramic materials, characterized in that... The comprehensive testing device for thermophysical properties of ceramic materials comprises a heat preservation box (300), a testing box (400), a top testing device, an in-box testing device (412) and a cooling and atmosphere control device (500); a box door (301) is arranged on the heat preservation box (300), a heat insulation layer (302) is arranged on the box wall of the heat preservation box (300), cooling pipe groups (303) are embedded in the heat insulation layer (302), the testing box (400) is arranged in the heat preservation box (300), a heat insulation layer (403) is arranged on the top wall of the box body of the testing box (400), and uniform temperature plates (402) are arranged on the left and right box walls and the bottom box wall of the testing box (400); heating rods (401) are arranged on the outer plate surface of each uniform temperature plate (402); The top of the testing box (400) is provided with the top testing device, the top testing device comprises two laser scanning range finders (406), heat insulation glass (407), a thermal radiation tester (408) and a cooling cavity shell (404), the heat insulation glass (407) is arranged on the top of the testing box (400), the two laser infrared scanning range finders (406) and the thermal radiation tester (408) are arranged on the heat insulation glass (407), and the cooling cavity shell (404) is arranged outside the two laser scanning range finders (406) and the thermal radiation tester (408); A plurality of in-box testing devices (412) are arranged in the testing box (400), and each in-box testing device (412) comprises a radiometer (413) and a temperature sensor (414); The cooling and atmosphere control device (500) comprises an atmosphere control box (501), a cooling control box (502), a first connecting pipe (503) and a second connecting pipe (504), the atmosphere control box (501) and the cooling control box (502) are installed on the outer box wall of the heat preservation box (300), the atmosphere control box (501) is internally provided with an atmosphere gas cylinder, the cooling control box (502) is internally provided with a cooling liquid, one end of the first connecting pipe (503) is connected with the atmosphere gas cylinder, the other end of the first connecting pipe (503) is in communication with the testing box (400), one end of the second connecting pipe (504) is in communication with the liquid outlet of the cooling control box (502), the other end of the second connecting pipe (504) is in communication with the liquid inlets of the cooling pipe groups (303) and the cooling cavity shell (404) respectively, and the liquid outlets of the cooling pipe groups (303) and the cooling cavity shell (404) are in communication with the backflow port of the cooling control box (502) through a third connecting pipe (505).

2. The device according to claim 1, wherein The box door (301) is hinged to the heat preservation box (300).

3. The device according to claim 1, wherein A sample table is arranged in the testing box (400).

4. The device of claim 1, wherein The thermal radiation tester (408) is located between the two laser infrared scanning range finders (406).

5. The device of claim 1, wherein The thermal radiation tester (408) comprises a total radiation meter (409) and an infrared temperature tester (410).

6. The device of claim 1, wherein A vacuum valve (405) is arranged on the top box wall of the testing box (400).

7. The device of claim 1, wherein The heating rods (401) are arranged in a serpentine or parallel and spaced manner.

8. The device of claim 1, wherein The heat preservation box (300) is placed on a base (100).

9. The device of claim 1, wherein A circulating pump is arranged on the third connecting pipe (505).

10. The device of claim 1, wherein The atmosphere gas cylinder is filled with liquid nitrogen or liquid helium.

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