Comprehensive testing device for thermophysical properties of ceramic material

Abstract

The invention relates to a comprehensive testing device for thermophysical properties of a ceramic material, aiming at solving the problem that the accuracy for testing the thermophysical properties of the ceramic material in the prior art needs to be improved. The comprehensive testing device for the ceramic material comprises a heat preservation 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 heat preservation box, temperature uniformizing plates are arranged on the left box wall, the right box wall and the bottom box wall of the testing box, and a heating rod is arranged on the outer plate face of each temperature uniformizing plate; a top testing device is arranged at the top of the testing box and comprises two laser scanning range finders, heat insulation glass, a heat radiation tester and a cooling cavity, and a cooling and atmosphere control device is installed on the outer box wall of the heat preservation box. The thermal expansion coefficient is tested by adopting a more accurate infrared laser scanning distance measurement method, and meanwhile, the thermal radiation intensity of the ceramic material is tested in the testing process, so that the thermal insulation performance of the ceramic material in the service process is evaluated.

Description

Technical Field

[0001] The invention belongs to the technical field of ceramic material thermophysical property testing equipment, and specifically relates to an integrated ceramic material thermophysical property testing device. The tested thermophysical properties include thermal expansion coefficient and thermal insulation performance. Background Art

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

[0003] At present, the main ways to obtain the thermal expansion coefficient and thermal insulation performance of ceramic materials are theoretical calculation and experimental measurement. Among them, the theoretical calculation method is not adopted because of the large number of variables considered, the complex calculation process, and the large application limitations. Experimental measurement is usually the main method to obtain the thermal properties of ceramic materials. However, most of the test methods have a long test process, the test results are not accurate enough, and it is impossible to directly and quickly obtain the thermal expansion coefficient and thermal insulation performance data of ceramic materials. Therefore, in view of the current core demand for quickly and accurately measuring the key thermal properties of ceramic materials, it is of great significance to design and develop a comprehensive performance testing device. Summary of the invention

[0004] The present invention provides a ceramic material thermal physical property comprehensive testing device to solve the problems that the accuracy of the existing testing of the thermal physical property of ceramic materials needs to be improved and the experimental cycle is long.

[0005] The ceramic material thermophysical property comprehensive testing device of the present invention comprises an insulation box, a test box, a top test device, an in-box test device and a cooling and atmosphere control device; a box door is arranged on the insulation box, a thermal insulation layer is arranged on the box wall of the insulation box, a cooling pipe group is buried in the thermal insulation layer, a test box is built in the insulation box, a thermal insulation layer is arranged on the top wall of the box body of the test box, and temperature equalizing plates are arranged on the left and right box walls and the bottom box wall of the test box, and a heating rod is arranged on the outer plate surface of each temperature equalizing plate;

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

[0007] A plurality of in-box test devices are arranged in the test box, wherein the in-box test devices are composed 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 box wall of the insulation box. The atmosphere control box is equipped with an atmosphere gas cylinder, and the cooling control box is equipped with coolant. One end of the first connecting pipe is connected to the atmosphere gas 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 liquid outlet of the cooling control box, and the other end of the second connecting pipe is respectively connected to the liquid inlet of the cooling tube group and the cooling cavity shell. The liquid outlet of the cooling tube group and the cooling cavity shell is connected to the reflux port of the cooling control box through the third connecting pipe.

[0009] The design of the ceramic material thermal physical property comprehensive testing device of the present invention is reasonable and also ensures the accuracy of the test results. The thermal physical property comprehensive testing device mainly tests the thermal expansion coefficient and thermal insulation performance of ceramic materials in a high temperature environment, so as to judge the application field of ceramic materials in engineering.

[0010] The present invention adopts a more accurate infrared laser scanning distance measurement method to test the thermal expansion coefficient. At the same time, during the test process, the thermal radiation intensity of the ceramic material is tested to evaluate the thermal insulation performance of the ceramic material during service. The test process adopts a more accurate test method to obtain the thermal expansion coefficient and thermal insulation performance of the ceramic material at the same time, thereby improving the accuracy of the experimental data. The results can directly predict the life and thermal insulation performance of the ceramic material during service, greatly shortening the time of the experimental test phase of the thermal protection coating and improving the experimental efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a top view of the comprehensive testing device for thermal physical properties of ceramic materials of the present invention;

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

[0013] Figure 3 It is a schematic diagram of the structure inside the test box of the present invention;

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

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

[0016] Figure 6 It is a schematic diagram of the test device in the box of the comprehensive test device for the thermal physical properties of ceramic materials of the present invention;

[0017] In the figure: 100 - base, 101 - level, 102 - adjustable feet, 200 - control console, 300 - heat preservation box, 301 - box door, 302 - insulation layer, 303 - cooling tube group, 400 - test box, 401 - heating rod, 402 - temperature plate, 403 - insulation layer, 404 - cooling chamber shell, 405 - vacuum valve, 406 - (rotary) laser scanning rangefinder, 407 - insulation glass, 408 - Thermal radiation tester, 409—total (infrared + visible light) radiometer, 410—infrared thermometer, 412—radiation test device in the box, 413—total (total radiation + convection) radiometer, 414—temperature sensor, 416—rotating axis, 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 DESCRIPTION

[0018] Specific implementation method 1: The comprehensive testing device for thermal physical properties of ceramic materials in this implementation method includes an insulation box 300, a test box 400, a top test device, an in-box test device 412 and a cooling and atmosphere control device 500; a box door 301 is provided on the insulation box 300, a thermal insulation layer 302 is provided on the box wall of the insulation box 300, a cooling pipe group 303 is buried in the thermal insulation layer 302, a test box 400 is built in the insulation box 300, a thermal insulation layer 403 is provided on the top wall of the box body of the test box 400, and temperature averaging plates 402 are provided on the left and right box walls and the bottom box wall of the test box 400, and a heating rod 401 is provided on the outer plate surface of each temperature averaging plate 402;

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

[0020] A plurality of in-box test devices 412 are disposed in the test box 400 , and the in-box test devices 412 are composed of a (global 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 box wall of the insulation box 300. The atmosphere control box 501 is equipped with an atmosphere gas cylinder, and the cooling control box 502 is equipped with coolant. One end of the first connecting pipe 503 is connected to the atmosphere gas 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 liquid outlet of the cooling control box 502, and the other end of the second connecting pipe 504 is respectively connected to the liquid inlet of the cooling tube group 303 and the cooling chamber shell 404. The liquid outlet of the cooling tube group 303 and the cooling chamber shell 404 is connected to the reflux port of the cooling control box 502 through the third connecting pipe 505.

[0022] The ceramic material thermal physical properties comprehensive testing device of this embodiment combines the thermal expansion coefficient test and the thermal insulation performance test of the ceramic material, fully utilizing the time of the heat preservation stage and the cooling stage to test the thermal physical properties of the ceramic material, thereby obtaining the thermal comprehensive performance of the ceramic material.

[0023] In this embodiment, the heating rod controls the temperature rise, and the cooling control box controls the temperature drop. During the heating and cooling process, the thermal expansion coefficient and thermal radiation performance of the sample are tested simultaneously, and the tester results are more accurate.

[0024] Specific implementation method 2: The difference between this implementation method and specific implementation method 1 is that the box door 301 is hinged to the thermal insulation box 300.

[0025] Specific implementation method three: This implementation method is different from specific implementation methods one or two in that a sample table is provided inside the test box 400 .

[0026] Specific implementation method 4: This implementation method is different from specific implementation methods 1 to 3 in that the thermal radiation tester 408 is located between the two laser infrared scanning rangefinders 406 .

[0027] Specific implementation method five: This implementation method is different from specific implementation methods one to four in that the thermal radiation tester 408 is composed of a total (infrared+visible light) radiometer 409 and an infrared thermometer 410 .

[0028] Specific implementation example 6: This implementation example is different from specific implementation examples 1 to 5 in that a vacuum valve 405 is provided on the top box wall of the test box 400 .

[0029] In this embodiment, the heat preservation box can be evacuated by means of the vacuum valve 405 .

[0030] Specific embodiment 7: This embodiment is different from any one of specific embodiments 1 to 6 in that the heating rods 401 are arranged in a serpentine (S-shaped) or parallel and spaced apart.

[0031] Specific implementation example eight: This implementation example is different from specific implementation examples one to seven in that the heat preservation box 300 is placed on the base 100 .

[0032] Specific embodiment 9: This embodiment is different from specific embodiments 1 to 8 in that a circulation pump is provided on the third connecting pipe 505 .

[0033] Specific implementation method ten: This implementation method is different from any one of specific implementation methods one to nine in that the atmosphere gas cylinder is filled with liquid nitrogen or liquid helium.

[0034] Embodiment: The comprehensive testing device for thermal physical properties of ceramic materials in this embodiment includes an insulation box 300, a test box 400, a top test device, an in-box test device 412 and a cooling and atmosphere control device 500; a box door 301 is provided on the insulation box 300, a temperature insulation layer 302 is provided on the inner box wall of the insulation box 300, a cooling pipe group 303 is buried in the temperature insulation layer 302, a test box 400 is built in the insulation box 300, a heat insulation layer 403 is provided on the top wall of the box body of the test box 400, and temperature averaging plates 402 are provided on the left and right box walls and the bottom box wall of the test box 400, and a heating rod 401 is provided on the outer plate surface of each temperature averaging plate 402, and a sample 600 is placed in the test box 400;

[0035] A top test device is arranged on the top of the test box 400, and the top test device includes two laser scanning rangefinders 406, a heat insulating glass 407, a thermal radiation tester 408 and a cooling chamber shell 404. The heat insulating glass 407 is arranged on the top of the test box 400, and the two laser scanning rangefinders 406 and the thermal radiation tester 408 are arranged on the heat insulating glass 407. The thermal radiation tester 408 is located between the two laser infrared scanning rangefinders 406. The laser scanning rangefinder 406 can be driven to rotate by a rotating shaft 416. The cooling chamber shell 404 is covered on the outside of the two laser scanning rangefinders 406 and the thermal radiation tester 408. The laser scanning rangefinder 406 performs a three-dimensional scan on 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, and the obtained results are calculated by a computer to obtain the body thermal expansion coefficient of the sample 600.

[0036] A plurality of in-box test devices 412 are disposed in the test box 400 , and the in-box test devices 412 are composed of a (global 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 is equipped with an atmosphere gas cylinder, the cooling control box 502 is equipped with a coolant, a heat sink is provided on the box wall of the cooling control box 502, and a fan can also be installed on the box wall for cooling. One end of the first connecting pipe 503 is connected to the atmosphere gas 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 liquid outlet of the cooling control box 502, and the other end of the second connecting pipe 504 is respectively connected to the liquid inlet of the cooling tube group 303 and the cooling chamber shell 404. The liquid outlets of the cooling tube group 303 and the cooling chamber shell 404 are connected to the reflux port of the cooling control box 502 through the third connecting pipe 505.

[0038] The control console 200 and the incubator 300 are placed on the base 100 , a level 101 is installed on the base 100 , and an adjustable foot 102 is provided on the base 100 , and the incubator 300 is horizontally adjusted by adjusting the foot.

[0039] The thermal radiation tester 408 of this embodiment comprises a total (infrared + visible light) radiometer 409 and an infrared thermometer 410 , and the total (infrared + visible light) 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 test device is divided into a top thermal radiation test device 408 and an in-box thermal radiation test device 412, which respectively test the thermal radiation performance of the sample 600 and the thermal radiation generated by the in-box temperature averaging plate 402. At the same time, each thermal radiation tester is equipped with a cooling device and high-temperature insulation glass to ensure that each instrument can be used safely in a high-temperature environment.

[0041] The rotary laser infrared scanning rangefinder 406 of this embodiment performs a morphological scan on the sample 600 after a certain period of heat preservation, and obtains the change in size of the sample 600 at the test temperature through computer calculation to obtain the thermal expansion coefficient. 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] The thermal insulation performance test results of this embodiment are obtained by simultaneously testing the sample 600 and the temperature equalizing plate 402 during the heating and insulation process in the box using a top heat radiation test device and an in-box test device, and then a computer performs error calculation on the two test results to obtain the thermal insulation performance of the sample 600.

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

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

[0045] S2. Place the sample in the test box and place the test box in an inert atmosphere through an atmosphere control box;

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

[0047] S4. When the temperature starts to rise, the cooling control device is turned on to cool down the test device and the outer shell of the incubator;

[0048] S5. During the heating process, the heat radiation test device in the box remains turned on to monitor the temperature and heat radiation intensity in the box;

[0049] S6. Raise the temperature to the test temperature and start testing the thermal radiation performance of the sample until the holding time is over, obtain the thermal radiation intensity of the sample at the test temperature, and at the same time perform a second dimension scan on the size of the sample at the test temperature to obtain the thermal expansion coefficient of the sample at the test temperature;

[0050] S7. After the test, keep the cooling system turned on until it cools to room temperature, adjust the atmosphere in the box, and then turn it off.

Claims

1. Comprehensive testing device for thermal physical properties of ceramic materials, characterized by The ceramic material thermophysical property comprehensive testing device comprises an insulation box (300), a test box (400), a top test device, an in-box test device (412) and a cooling and atmosphere control device (500); a box door (301) is arranged on the insulation box (300); a temperature insulation layer (302) is arranged on the box wall of the insulation box (300); a cooling pipe group (303) is buried in the temperature insulation layer (302); a test box (400) is built in the insulation box (300); a heat insulation layer (403) is arranged on the box top wall of the test box (400); temperature equalizing plates (402) are arranged on the left and right box walls and the bottom box wall of the test box (400); and a heating rod (401) is arranged on the outer plate surface of each temperature equalizing plate (402); A top test device is arranged on the top of the test box (400), and the top test device comprises two laser scanning rangefinders (406), a heat insulating glass (407), a thermal radiation tester (408) and a cooling chamber shell (404); the heat insulating glass (407) is arranged on the top of the test box (400), the two laser infrared scanning rangefinders (406) and the thermal radiation tester (408) are arranged on the heat insulating glass (407), and the cooling chamber shell (404) is arranged outside the two laser scanning rangefinders (406) and the thermal radiation tester (408); A plurality of in-box test devices (412) are arranged in the test box (400), wherein the in-box test devices (412) are composed of 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 equipped with an atmosphere gas cylinder, and the cooling control box (502) is equipped with a coolant. One end of the first connecting pipe (503) is connected to the atmosphere gas cylinder, and the second connecting pipe (504) is connected to the atmosphere gas cylinder. The other end of a connecting pipe (503) is connected to the test box (400), one end of a second connecting pipe (504) is connected to the liquid outlet of the cooling control box (502), the other end of the second connecting pipe (504) is respectively connected to the liquid inlet of the cooling pipe group (303) and the cooling chamber shell (404), and the liquid outlet of the cooling pipe group (303) and the cooling chamber shell (404) is connected to the reflux port of the cooling control box (502) through a third connecting pipe (505).

2. The ceramic material thermophysical properties comprehensive testing device according to claim 1, characterized in that The box door (301) is hinged to the heat preservation box (300).

3. The ceramic material thermophysical properties comprehensive testing device according to claim 1, characterized in that A sample stage is arranged inside the test box (400).

4. The ceramic material thermophysical properties comprehensive testing device according to claim 1, characterized in that The thermal radiation tester (408) is located between the two laser infrared scanning rangefinders (406).

5. The ceramic material thermophysical properties comprehensive testing device according to claim 1, characterized in that The thermal radiation tester (408) is composed of a global radiometer (409) and an infrared thermometer (410).

6. The ceramic material thermophysical properties comprehensive testing device according to claim 1, characterized in that A vacuum valve (405) is provided on the top box wall of the test box (400).

7. The ceramic material thermophysical properties comprehensive testing device according to claim 1, characterized in that The heating rods (401) are arranged in a serpentine shape or in parallel and spaced apart arrangement.

8. The ceramic material thermophysical properties comprehensive testing device according to claim 1, characterized in that The heat preservation box (300) is placed on the base (100).

9. The ceramic material thermophysical properties comprehensive testing device according to claim 1, characterized in that A circulation pump is provided on the third connecting pipe (505).

10. The ceramic material thermophysical properties comprehensive testing device according to claim 1, characterized in that The atmosphere gas cylinder is filled with liquid nitrogen or liquid helium.

Images