Clamp for testing thermal performance of thermal insulation material and application of clamp

Abstract

The invention relates to a clamp for testing the thermal performance of a thermal insulation material and application thereof. The clamp comprises an upper pressing plate and a lower pressing plate, wherein a first clamping groove is formed in the middle of the upper pressing plate; a second clamping groove is formed in the middle of the lower pressing plate; the upper pressing plate is connected with the lower pressing plate; an accommodating cavity is formed between the upper pressing plate and the lower pressing plate and is used for placing a heat insulation material to be tested; the vapor chamber is arranged in the first clamping groove; the vapor chamber is used for conducting heat supplied by the heating body to the heat insulation material; the temperature measuring plate is arranged in the second clamping groove; a plurality of temperature measuring points are arranged on the upper surface of the temperature measuring plate; when the thermal performance of the thermal insulation material is tested, the temperature measuring device measures the temperature of the thermal insulation material through the temperature measuring point. The technical problem to be solved by the invention is how to provide the clamp for testing the thermal performance of the thermal insulation material and the testing method, so that the thermal performance of the thermal insulation material can be accurately measured under a high-temperature or ultra-high-temperature condition, and the clamp and the testing method are more practical.

Description

Technical Field

[0001] The present invention relates to the technical field of high-temperature resistant thermal insulation materials, and particularly to a fixture for testing the thermal performance of thermal insulation materials and its application. Background Art

[0002] Multi-layer thermal insulation materials represented by flexible gradient thermal insulation materials have been widely used in the fields of aviation, aerospace, ordnance, etc., such as the thermal insulation layer of aircraft engines, due to their excellent high-temperature resistance, low thermal conductivity, and special-shaped surface characteristics.

[0003] The thermal performance test of thermal insulation materials is very important. In the prior art, the thermal performance test of thermal insulation materials is mainly carried out in the following ways: flat furnace thermal experiment, oxyacetylene flame thermal experiment, quartz lamp thermal experiment, and graphite heating body thermal experiment, etc. For the above various test methods, the thermal performance of the thermal insulation materials is difficult to be correctly measured due to the expansion deformation of the thickness of the thermal insulation materials under high-temperature conditions; moreover, during the thermal performance test of the thermal insulation materials, especially under ultra-high temperature conditions, the heat dissipation will also have a great impact on the accuracy of the measurement results.

[0004] At present, there is no method and measurement equipment that can accurately measure the thermal performance of thermal insulation materials under high temperature or ultra-high temperature conditions. Summary of the Invention

[0005] The main purpose of the present invention is to provide a fixture for testing the thermal performance of thermal insulation materials and its application. The technical problem to be solved is how to provide a fixture and a test method for testing the thermal performance of thermal insulation materials, so that it can accurately measure the thermal performance of thermal insulation materials under high temperature or ultra-high temperature conditions, and thus be more suitable for practical use.

[0006] The object of the present invention and the solution to its technical problems are achieved by the following technical solutions. A fixture for testing the thermal performance of thermal insulation materials according to the present invention includes:

[0007] An upper pressure plate, with a first card slot provided at its middle position;

[0008] A lower pressure plate, with a second card slot provided at its middle position; the upper pressure plate is connected to the lower pressure plate; a cavity is provided between the upper pressure plate and the lower pressure plate for placing the thermal insulation material to be tested;

[0009] A heat sink plate, which is arranged in the first card slot; the heat sink plate is used to conduct the heat supplied by the heating element to the thermal insulation material;

[0010] A temperature measurement plate, which is arranged in the second card slot; a plurality of temperature measurement points are provided on the upper surface of the temperature measurement plate; during the thermal performance test of the thermal insulation material, the temperature measurement equipment measures the temperature of the thermal insulation material through the temperature measurement points.

[0011] The object of the present invention and the technical problems to be solved can be further realized by the following technical measures.

[0012] Preferably, the aforementioned fixture further includes a heat insulation plate; the heat insulation plate is respectively connected to the upper pressing plate and the lower pressing plate; a sealed cavity is formed by enclosing the upper pressing plate, the lower pressing plate and the heat partition plate.

[0013] Preferably, in the aforementioned fixture, a first blind hole and a second blind hole are provided on the lower surface of the upper pressing plate; a first through hole and a second through hole are provided on the lower pressing plate; the shapes and sizes of the first blind hole and the first through hole match, and the heat insulation plate passes through the first through hole and is inserted into the first blind hole; the shapes and sizes of the second blind hole and the second through hole match; the screw passes through the second through hole and is inserted into the second blind hole, and the screw is locked by a nut below the lower pressing plate.

[0014] Preferably, in the aforementioned fixture, a first blind groove is provided on the outer side of the heat sink plate on the lower surface of the upper pressing plate; a second blind groove is provided on the outer side of the temperature measuring plate on the upper surface of the lower pressing plate; both the first blind groove and the second blind groove are arranged towards the cavity.

[0015] Preferably, the material of the aforementioned heat sink plate is a non-oxide ceramic material.

[0016] Preferably, the materials of the upper pressing plate, the lower pressing plate and the connecting member connecting the two are ceramic matrix composites with a high temperature resistance of ≥1000°C.

[0017] Preferably, the aforementioned composite material is a composite material prepared from a long fiber woven preform, and the laying direction of the woven fabric forms a 90° angle with the heat conduction direction of the heat insulation material.

[0018] Preferably, the aforementioned heat insulation plate is selected from aerogel materials and / or fiber blankets; the material of the aerogel material is selected from at least one of carbon, zirconia, alumina and silica; the material of the fiber blanket is selected from at least one of carbon felt, zirconia, alumina and aluminosilicate.

[0019] Preferably, the material of the aforementioned temperature measuring plate is selected from at least one of alumina, aluminosilicate and basalt.

[0020] The object of the present invention and the technical problems to be solved are realized by the following technical solutions. An application of the aforementioned fixture in the field of heat performance testing of heat insulation materials according to the present invention is proposed.

[0021] The object of the present invention and the technical problems to be solved are achieved by the following technical solutions. A method for testing the thermal performance of a heat-insulating material according to the present invention first fixes the heat-insulating material by using the aforementioned fixture; then performs a thermal performance test on the heat-insulating material.

[0022] By means of the above technical solutions, a fixture for testing the thermal performance of a heat-insulating material and its application provided by the present invention at least have the following advantages:

[0023] The fixture for testing the thermal performance of a heat-insulating material and its application provided by the present invention form a cavity with accurate dimensions for placing the heat-insulating material by designing a special fixture for thermal performance measurement and adjusting the relative positions of the upper pressing plate and the lower pressing plate, so that the upper and lower surfaces of the heat-insulating material to be measured are respectively in contact with the upper pressing plate and the lower pressing plate; moreover, once the relative positions of the upper pressing plate and the lower pressing plate are determined, they are fixed. Therefore, during the whole process of measuring the thermal performance of the heat-insulating material, almost no expansion deformation of the heat-insulating material with an increased thickness will occur, thereby reducing the influence of the expansion deformation on the heat-insulating performance of the heat-insulating material, making the measurement result more objective and real, with high accuracy, and good repeatability and reproducibility of the test result.

[0024] Furthermore, through the design of heat-insulating plates respectively connecting the upper pressing plate and the lower pressing plate, the present invention enables the upper pressing plate, the lower pressing plate and the heat-insulating partition plate to enclose a sealed cavity, that is, the heat-insulating material to be measured is in the sealed cavity during the whole test process, reducing or even possibly avoiding the heat dissipation of the heat-insulating material, thereby reducing the error of the measured temperature and making the measurement result more objective and real, with high accuracy.

[0025] Furthermore, by using the connection structure of screw and nut to connect the upper pressing plate and the lower pressing plate, the present invention enables the thickness of the cavity to be flexibly adjusted according to the thickness of the heat-insulating material, so as to realize that the fixture can be applied to the thermal performance test of heat-insulating materials with various thicknesses, reducing the types of fixture specifications.

[0026] Furthermore, by defining the laying direction of the woven fiber in the upper pressing plate, the lower pressing plate and their connecting components to be horizontally laid, the present invention can effectively alleviate the heat conduction along the composite material direction, thereby reducing or avoiding the influence on the detection result of the heat-insulating performance of the heat-insulating material.

[0027] Furthermore, by providing a first blind groove on the upper pressing plate and a second blind groove on the lower pressing plate, the present invention reduces or avoids the heat loss of the heat transmitted circumferentially through the pressing plate, ensuring that the heat conduction is as much as possible downward, thereby further improving the accuracy of the thermal performance detection of the heat-insulating material.

[0028] The above description is only an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and be able to implement it according to the content of the specification, the following will detail the preferred embodiments of the present invention in conjunction with the accompanying drawings as follows. Description of the Drawings

[0029] Figure 1 It is a schematic three-dimensional structure diagram of the fixture of the present invention;

[0030] Figure 2 It is a schematic three-dimensional structure diagram of the upper pressing plate of the fixture of the present invention;

[0031] Figure 3 It is a schematic plan view of the upper pressing plate of the fixture of the present invention - from the perspective of the lower surface;

[0032] Figure 4 It is a schematic three-dimensional structure diagram of the lower pressing plate of the fixture of the present invention;

[0033] Figure 5 It is a schematic plan view of the lower pressing plate of the fixture of the present invention - from the perspective of the upper surface;

[0034] Figure 6 It is a schematic diagram of the fiber direction and heat conduction direction of the woven fabric in the ceramic matrix composite material;

[0035] Figure 7 It is a schematic diagram of heat transfer when the upper pressing plate and the lower pressing plate are not provided with the first blind groove and the second blind groove;

[0036] Figure 8 It is a schematic diagram of heat transfer after the upper pressing plate and the lower pressing plate are provided with the first blind groove and the second blind groove. Detailed Embodiment

[0037] To further elaborate on the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following will detail the specific embodiment, structure, features and effects of a fixture for testing the thermal performance of a thermal insulation material and its application proposed according to the present invention in conjunction with the accompanying drawings and preferred embodiments. In the following description, different "one embodiment" or "embodiment" do not necessarily refer to the same embodiment. In addition, the specific features, structures or characteristics in one or more embodiments can be combined in any suitable form.

[0038] The present invention proposes a fixture for testing the thermal performance of a thermal insulation material, as shown in the attached Figure 1 to the attached Figure 8 shown, which includes an upper pressing plate 1; a first card slot 11 is provided at the middle position of the upper pressing plate; this first card slot is used for subsequent assembly of the heat sink plate.

[0039] The fixture further includes a heat sink 3; the heat sink is disposed in the first card slot; the mating form of the first card slot and the heat sink can be carried out in a conventional mating manner in the technical field, as long as the two can be closely mated, and no specific limitation is made in the present invention. In some specific embodiments, the first card slot of the upper pressing plate is a square inner cavity, and the heat sink is a square block; the outer diameter dimension of the heat sink matches the inner diameter dimension of the first card slot, and the two are closely mated by the way of clamping connection between the inner cavity of the first card slot and the outer wall of the heat sink.

[0040] The heat sink of the present invention needs to be in contact with the heating element. The function of the heat sink is to efficiently and evenly conduct the heat generated by the heating element to the heat insulation material. At the same time, the heat sink also needs to be able to isolate the current of the heating element. Therefore, the material selection of the heat sink needs to have the following characteristics: insulation, high temperature resistance, high thermal conductivity, and generally non-oxide ceramic materials are selected. The preferred materials for the heat sink are boron nitride, aluminum nitride, silicon nitride, etc.; and the specific materials can be selected according to different test temperatures. For example, a heat sink made of boron nitride can be used when the test temperature ≥ 2200 °C, a heat sink made of aluminum nitride can be used when the test temperature is between 1600 °C and 2200 °C, and a heat sink made of silicon nitride can be used when the test temperature ≤ 1600 °C.

[0041] The fixture further includes a lower pressing plate 2; a second card slot 21 is provided at the middle position of the lower pressing plate; the upper pressing plate is connected to the lower pressing plate; the connection manner of the upper pressing plate and the lower pressing plate can be carried out in a conventional connection manner in the technical field, as long as the relative position relationship between the two can be determined, for example, it can be a frame connection or a connection through a screw and nut, and no specific limitation is made in the present invention; a cavity is provided between the upper pressing plate and the lower pressing plate for placing the heat insulation material to be tested; when performing the thermal performance test of the heat insulation material, the heat insulation material is placed in the cavity, so that the upper surface of the heat insulation material contacts the upper pressing plate and the lower surface contacts the lower pressing plate, and then the test is carried out.

[0042] The fixture further includes a temperature measuring plate 4; the temperature measuring plate is disposed in the second card slot; the mating form of the second card slot and the temperature measuring plate can be carried out in a conventional mating manner in the technical field, as long as the two can be closely mated, and no specific limitation is made in the present invention. In some specific embodiments, the second card slot of the lower pressing plate is a square inner cavity, which includes an upper opening and a lower opening; a necked clamping structure 25 is provided at the lower opening of the second card slot; the temperature measuring plate is a square block; the outer diameter dimension of the temperature measuring plate matches the inner diameter dimension of the second card slot, and the two are mated through the inner cavity of the second card slot and the outer wall of the heat sink, and are connected together through the clamping structure of the second card slot; the technical purpose of setting the clamping structure is to stably connect the temperature measuring plate and prevent the temperature measuring plate from slipping off from the second card slot and causing the detection to fail.

[0043] A number of temperature measurement points are arranged on the upper surface of the temperature measurement plate; these temperature measurement points are connected to a measuring device and are used to measure the temperature of the back surface, that is, the lower surface of the thermal insulation material during the thermal performance test of the thermal insulation material, so as to reduce the heat loss caused by heat conduction as much as possible and reduce or avoid its influence on the thermal performance of the thermal insulation material. The material of the temperature measurement plate needs to have the following characteristics: insulation and low thermal conductivity. Since it is at the low-temperature end after the thermal insulation material is isolated, generally, a temperature resistance of 600 °C can meet the requirements, and the materials that can be selected include, but are not limited to, composite materials such as alumina, aluminum silicate, and basalt. The technical purpose of setting the temperature measurement points on the upper surface of the temperature measurement plate in the present invention is to accurately measure the temperature of the lower surface of the thermal insulation material, so as to objectively and truly evaluate the heat insulation performance of the thermal insulation material and avoid the influence of the temperature measurement plate itself on the thermal performance.

[0044] The above technical solution designs the structure of a special fixture for measuring the thermal performance of the thermal insulation material, so that the thermal insulation material to be measured is tightly clamped by the upper pressing plate and the lower pressing plate. During the entire process of measuring the thermal performance of the thermal insulation material, the thickness of the thermal insulation material hardly changes due to thickening, expansion, or deformation, thereby reducing the influence on the heat insulation performance of the thermal insulation material caused by the expansion and deformation of the thermal insulation material, making the measurement result more objective and real, with high accuracy, and good repeatability and reproducibility of the test result.

[0045] The fixture further includes a heat insulation plate 5; the heat insulation plate is respectively connected to the upper pressing plate and the lower pressing plate; the upper pressing plate, the lower pressing plate, and the heat insulation partition enclose a sealed cavity. Through the design of the heat insulation plate that is respectively connected to the upper pressing plate and the lower pressing plate in the present invention, the upper pressing plate, the lower pressing plate, and the heat insulation partition enclose a sealed cavity, that is, the thermal insulation material to be measured is in the sealed cavity during the entire test process, reducing or even possibly avoiding the heat dissipation of the thermal insulation material, thereby reducing the error of the measured temperature and making the measurement result more objective and real, with high accuracy.

[0046] In order to better realize the connection of the upper pressing plate, the lower pressing plate, and the heat insulation partition, the present invention preferably provides a first blind hole 13 and a second blind hole 12 on the lower surface of the upper pressing plate; a first through hole 23 and a second through hole 22 are provided on the lower pressing plate; the shapes and sizes of the first blind hole and the first through hole match, and the heat insulation plate passes through the first through hole and is inserted into the first blind hole; the shapes and sizes of the second blind hole and the second through hole match; a screw 61 passes through the second through hole and is inserted into the second blind hole, and the screw is locked by a nut 62 below the lower pressing plate.

[0047] The specific shapes of the upper pressing plate and the lower pressing plate can be designed according to the sample requirements for the thermal performance test of the thermal insulation material.

[0048] In some specific embodiments of the present invention, the upper pressing plate and the lower pressing plate are both square structures; the first blind hole and the first through hole are designed to be rectangular holes with a rectangular cross-section, so that the insulation board can smoothly pass through the first through hole and be inserted into the first blind hole to achieve its connection; the first blind hole is four rectangular holes arranged on the four sides of the upper pressing plate; the first through hole is four rectangular holes arranged on the four sides of the lower pressing plate; there are four insulation boards, and the sealed cavity enclosed by the upper pressing plate, the lower pressing plate and the insulation board is a rectangular cavity to adapt to the outer dimensions of the insulation material being tested.

[0049] In some specific embodiments of the present invention, both the upper pressing plate and the lower pressing plate are square structures; the second blind hole and the second through hole are designed as circular holes with circular cross-sections, so that the screw can smoothly pass through the second through hole and be inserted into the second blind hole to achieve the connection; the second blind hole is four circular holes arranged at the four corners of the upper pressing plate; the second through hole is four circular holes arranged at the four corners of the lower pressing plate; there are four sets of screws and nuts. The distance between the upper pressing plate and the lower pressing plate can be flexibly adjusted by adjusting the position of the nut to adapt to the sizes of the tested thermal insulation materials of various thicknesses; the present invention connects the upper pressing plate and the lower pressing plate by using the connection structure of the screw and the nut, so that the thickness of the cavity can be flexibly adjusted according to the thickness of the thermal insulation material, so that the fixture can be applied to the thermal performance test of thermal insulation materials of various thicknesses, and the fixture can be adjusted and reused, reducing the types of specifications of the fixture and saving costs.

[0050] In the above technical solution, the upper pressing plate, the lower pressing plate, the connecting screw and the locking nut are used to cooperate with each other to tighten the thermal insulation material to prevent the thickness of the thermal insulation material from changing when it expands under high temperature conditions, and to reduce the heat loss caused by heat conduction as much as possible. Therefore, the material selection needs to have the following characteristics: high temperature resistance, low thermal conductivity, and high strength. It is preferred that the material of the upper pressing plate, the lower pressing plate and the connecting parts connecting the two is a ceramic-based composite material with a high temperature resistance of ≥1000℃.

[0051] The ceramic-based composite material is preferably a high-temperature resistant ceramic-based composite material such as C / C, C / SiC, zirconia, and alumina; and different materials can be selected according to different test temperatures. For example, when the test temperature is ≥2200°C, C / C and C / SiC composite materials can be used, when the test temperature is between 1600°C and 2200°C, zirconia composite materials can be used, and when the test temperature is ≤1600°C, alumina composite materials can be used. When the composite material is C / C or C / SiC, it is preferred to prepare a layer of SiC coating on its surface by CVD method to improve its anti-oxidation performance.

[0052] In order to make the results of the thermal performance test of the thermal insulation material more objective, real and accurate, the ceramic matrix composite material used in the upper pressure plate, lower pressure plate and screw-nut connection components of the fixture of the present invention is a composite material prepared from a long fiber woven preform. Preferably, the laying direction of the woven fabric forms a 90° angle with the heat conduction direction. The heat conduction direction mentioned here refers to the heat flow direction from the upper pressure plate to the lower pressure plate, that is, the vertical direction; Attached Figure 6 The figure shows the fiber laying direction in the composite material with the connecting screw as an example. The fiber laying direction of the woven fabric in the screw is the horizontal direction. Similarly, the fiber laying direction in the upper pressure plate and the lower pressure plate is also preferably the horizontal direction. The technical purpose of such a design is to effectively relieve the conduction of heat along the composite material direction, thereby reducing or avoiding its influence on the test results of the thermal insulation performance of the thermal insulation material.

[0053] In the above technical solution, the main function of the heat insulation board is to prevent the circumferential diffusion of heat. Therefore, the material of the heat insulation board needs to have the following characteristics: high temperature resistance, low thermal conductivity, and low density. For this reason, the heat insulation board of the present invention is preferably an aerogel material and / or a fiber blanket. Among them, the aerogel material is preferably at least one of carbon, zirconia, alumina and silica; the fiber blanket material is preferably at least one of carbon felt, zirconia, alumina and aluminum silicate; and different materials can be selected according to different test temperatures. For example, when the test temperature ≥ 2200 °C, a heat insulation board made of carbon aerogel and / or carbon felt can be used. When the test temperature is between 1600 °C and 2200 °C, a heat insulation board made of zirconia aerogel and / or zirconia blanket can be used. When the test temperature ≤ 1600 °C, a heat insulation board made of at least one of alumina aerogel, silica aerogel, alumina blanket and aluminum silicate blanket can be used.

[0054] In order to minimize the circumferential diffusion of heat as much as possible, the present invention preferably provides a first blind groove 14 on the outer side of the heat equalizing plate on the lower surface of the upper pressure plate; a second blind groove 24 is provided on the outer side of the temperature measuring plate on the upper surface of the lower pressure plate; both the first blind groove and the second blind groove are arranged towards the cavity, as shown in the attached Figure 7 and the attached Figure 8 shown. The attached Figure 7 shows the structure without blind grooves. In this case, the heat in the upper pressure plate and the lower pressure plate may partially escape along the fiber laying direction of the composite material, which may affect the test results of the thermal insulation performance of the thermal insulation material. The present invention preferably provides blind grooves on the upper pressure plate and the lower pressure plate. The setting of the blind grooves can block the heat flow to a certain extent and change the heat conduction direction. As shown in the attached Figure 8 shown, after setting square blind grooves on the pressure plate, especially on the lower pressure plate, the heat of the pressure plate will be conducted downward as much as possible, thereby reducing the heat loss during the thermal performance test to a greater extent and improving the accuracy of the test results.

[0055] The present invention also provides an application of the aforesaid fixture in the field of thermal property testing of thermal insulation materials.

[0056] The present invention also provides a method for testing the thermal properties of thermal insulation materials. First, the aforesaid fixture is used to fix the thermal insulation materials; then, the thermal properties of the thermal insulation materials are tested.

[0057] The present invention will be further described below in conjunction with specific embodiments, but it should not be construed as a limitation on the protection scope of the present invention. Some non-essential improvements and adjustments made by those skilled in the art to the present invention based on the above content of the present invention still fall within the protection scope of the present invention.

[0058] Unless otherwise specified, the materials, reagents, etc. involved below are all commercially available products well-known to those skilled in the art; unless otherwise specified, the methods are all well-known methods in the art. Unless otherwise defined, the technical terms or scientific terms used should have the ordinary meaning understood by those of ordinary skill in the art to which the present invention belongs.

[0059] Example 1

[0060] Taking the test temperature of 2300 °C and the thickness of the tested thermal insulation material of 30 mm as an example, the design of the adjustable fixture for testing the thermal properties of thermal insulation materials is as follows:

[0061] The size of the isothermal plate is 50 mm × 50 mm × 5 mm, and the material is selected as boron nitride.

[0062] The size of the temperature measuring plate is 50 mm × 50 mm × 3 mm, and the material is selected as aluminosilicate composite material.

[0063] The sizes of the upper pressing plate and the lower pressing plate are both 110 mm × 110 mm × 5 mm. The sizes of the four connecting screws are all 110 mm in length and 8 mm in diameter. The sizes of the four locking nuts are all M8. The materials of the upper pressing plate, the lower pressing plate, the screws and the nuts are selected as C / SiC composite materials, and a SiC coating is deposited on the surface by the CVD method.

[0064] The sizes of the four thermal insulation plates are all 110 mm × 90 mm × 10 mm, and the material is selected as carbon aerogel.

[0065] Install the adjustable fixture for testing the thermal performance of the thermal insulation material according to the following steps: Install the heat sink plate into the first card slot of the upper pressure plate to connect it with the upper pressure plate; install the temperature measuring plate into the second card slot of the lower pressure plate to connect it with the lower pressure plate; use the upper pressure plate and the lower pressure plate to clamp the thermal insulation material in the middle, pass four connecting screws through the four second through holes of the lower pressure plate and connect them with the four second blind holes of the upper pressure plate, adjust the distance between the four connecting screws between the upper pressure plate and the lower pressure plate to 30 mm, and fasten them with four locking nuts; pass four heat insulation plates through the four first through holes of the lower pressure plate and connect them with the four first blind holes of the upper pressure plate.

[0066] After clamping the thermal insulation material sample according to the above procedure, perform the thermal performance detection of the thermal insulation material according to the experimental steps, and conduct three parallel detections using the same thermal insulation material. The results are as follows:

[0067] The result of the first test: the thickness of the thermal insulation material is 30 mm, and the test temperature is 402 °C;

[0068] The result of the second test: the thickness of the thermal insulation material is 30 mm, and the test temperature is 410 °C;

[0069] The result of the third test: the thickness of the thermal insulation material is 30 mm, and the test temperature is 406 °C;

[0070] According to the above test results, it can be seen that the thickness of the thermal insulation material after three detections is 30 mm, which is equal to the thickness of the original thermal insulation material before testing, indicating that the thermal insulation material did not expand or deform during the testing process; the test temperatures are all greater than 400 °C, indicating that the thermal insulation material tested in this embodiment can insulate the high temperature of 2300 °C and reduce it to a level above 400 °C; moreover, the difference between the highest temperature and the lowest temperature in the three tests is not large, only 8 °C, indicating that the repeatability and reproducibility of multiple detections are good.

[0071] Comparative Example 1

[0072] According to the method in the prior art, without using any fixture to clamp the thermal insulation material, directly perform the thermal performance detection of the thermal insulation material according to the experimental steps. The test temperature is 2300 °C, and the thickness of the thermal insulation material to be tested is 30 mm, which is the same as the sample in Example 1. Conduct three parallel detections using the same thermal insulation material. The results are as follows:

[0073] The result of the first test: the thickness of the thermal insulation material is 35 mm, and the test temperature is 394 °C;

[0074] The result of the second test: the thickness of the thermal insulation material is 40 mm, and the test temperature is 358 °C;

[0075] The result of the third test: the thickness of the thermal insulation material is 37 mm, and the test temperature is 372 °C;

[0076] According to the above test results, it can be seen that the thickness of the thermal insulation material after three detections is greater than that of the original thermal insulation material before testing. When the deformation is large, the deformation degree is as high as 33.3% (the thickness expands from 30 mm to 40 mm), indicating that a large expansion deformation occurred to the thermal insulation material during the testing process. The test temperature is less than 400 °C, indicating that the thermal insulation material being tested in this comparative example can insulate the high temperature of 2300 °C and reduce it to a level below 400 °C. From the comparison of the above results, it can be seen that the thermal insulation ability of the thermal insulation material obtained in Comparative Example 1 is higher than that of the thermal insulation material obtained in Example 1, indicating that it overestimated the thermal insulation ability of the thermal insulation material sample. Moreover, the difference between the highest temperature and the lowest temperature in the three tests is relatively large, up to 36 °C, indicating that the repeatability and reproducibility of multiple detections are poor.

[0077] Furthermore, in the three detections of the comparative example, it was found that the greater the thickness deformation of the thermal insulation material, the lower the corresponding test temperature, and it is more likely to overestimate the thermal insulation ability of the thermal insulation material, and the error of the test results is relatively large.

[0078] Example 2

[0079] Taking the test temperature of 1800 °C and the thickness of the thermal insulation material being tested of 20 mm as an example, the design of the adjustable fixture for testing the thermal performance of the thermal insulation material is as follows:

[0080] The size of the heat sink plate is 50 mm × 50 mm × 5 mm, and the material is selected as aluminum nitride.

[0081] The size of the temperature measurement plate is 50 mm × 50 mm × 3 mm, and the material is selected as alumina composite material.

[0082] The sizes of the upper pressure plate and the lower pressure plate are both 110 mm × 110 mm × 5 mm. The sizes of the four connecting screws are all 110 mm in length and 8 mm in diameter. The sizes of the four locking nuts are all M8. The materials of the upper pressure plate, the lower pressure plate, the screws and the nuts are selected as zirconia composite materials; as shown in Attachment Figure 2 to Attachment Figure 5 As shown, square annular blind grooves 14 and 24 are provided on the lower surface of the upper pressure plate and the upper surface of the lower pressure plate. The width of the blind groove is 10 mm and the depth is 3 mm.

[0083] The sizes of the four heat insulation plates are all 110 mm × 90 mm × 10 mm, and the material is selected as zirconia blanket.

[0084] The clamping steps of the thermal insulation material are the same as those in Example 1, and the distance between the upper pressure plate and the lower pressure plate is 20 mm.

[0085] After clamping the thermal insulation material sample according to the above procedure, the thermal performance of the thermal insulation material is detected according to the experimental steps. The same thermal insulation material is used for three parallel detections, and the results are as follows:

[0086] The results of the first test: the thickness of the heat-insulating material is 20 mm, and the test temperature is 294 °C;

[0087] The results of the second test: the thickness of the heat-insulating material is 20 mm, and the test temperature is 296 °C;

[0088] The results of the third test: the thickness of the heat-insulating material is 20 mm, and the test temperature is 289 °C.

[0089] Example 3

[0090] Taking the test temperature of 1200 °C and the thickness of the heat-insulating material to be tested of 45 mm as an example, the design of the adjustable fixture for the thermal performance test of the heat-insulating material is as follows:

[0091] The size of the heat sink plate is 100 mm × 100 mm × 5 mm, and the material is selected as silicon nitride.

[0092] The size of the temperature measuring plate is 100 mm × 100 mm × 3 mm, and the material is selected as aluminosilicate composite material.

[0093] The sizes of the upper pressure plate and the lower pressure plate are both 160 mm × 160 mm × 5 mm, the sizes of the four connecting screws are all 160 mm in length and 10 mm in diameter, the sizes of the four locking nuts are all M10, and the materials of the upper pressure plate, the lower pressure plate, the screws and the nuts are selected as alumina composite material.

[0094] The sizes of the four heat-insulating plates are all 160 mm × 150 mm × 10 mm, and the material is selected as alumina aerogel.

[0095] The clamping steps of the heat-insulating material are the same as those in Example 1, and the distance between the upper pressure plate and the lower pressure plate is 45 mm.

[0096] After clamping the heat-insulating material sample according to the above procedure, the thermal performance of the heat-insulating material is detected according to the experimental steps, and the same heat-insulating material is used for three parallel detections. The results are as follows:

[0097] The results of the first test: the thickness of the heat-insulating material is 45 mm, and the test temperature is 95 °C;

[0098] The results of the second test: the thickness of the heat-insulating material is 45 mm, and the test temperature is 102 °C;

[0099] The results of the third test: the thickness of the heat-insulating material is 45 mm, and the test temperature is 98 °C.

[0100] The technical features in the claims and / or the description of the present invention can be combined, and the combination method is not limited to the combination obtained through the citation relationship in the claims. The technical solutions obtained by combining the technical features in the claims and / or the description are also within the protection scope of the present invention.

[0101] As described above, it is only the preferred embodiment of the present invention, and it does not impose any formal restrictions on the present invention. Any simple modification, equivalent change, and modification made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A fixture for testing the thermal performance of a heat insulation material, characterized in that, It includes: An upper pressing plate, with a first card slot provided at its middle position; A lower pressing plate, with a second card slot provided at its middle position; the upper pressing plate is connected to the lower pressing plate; A cavity is provided between the upper pressing plate and the lower pressing plate for placing the heat-insulating material to be tested; A heat pipe, which is arranged in the first card slot; the heat pipe is used to conduct the heat supplied by the heating element to the heat-insulating material; A temperature measuring plate, which is arranged in the second card slot; a number of temperature measuring points are provided on the upper surface of the temperature measuring plate; during the thermal performance test of the heat-insulating material, the temperature measuring device measures the temperature of the heat-insulating material through the temperature measuring points.

2. The fixture according to claim 1, characterized in that, It further includes a heat-insulating plate; the heat-insulating plate is respectively connected to the upper pressing plate and the lower pressing plate; the upper pressing plate, the lower pressing plate and the heat-insulating partition enclose to form a sealed cavity.

3. The fixture according to claim 2, characterized in that, The lower surface of the upper pressing plate is provided with a first blind hole and a second blind hole; the lower pressing plate is provided with a first through hole and a second through hole; the shapes and sizes of the first blind hole and the first through hole match, and the heat-insulating plate passes through the first through hole and is inserted into the first blind hole; the shapes and sizes of the second blind hole and the second through hole match; a screw passes through the second through hole and is inserted into the second blind hole, and the screw is locked by a nut below the lower pressing plate.

4. The fixture according to claim 2, characterized in that, A first blind groove is provided on the outer side of the heat pipe on the lower surface of the upper pressing plate; a second blind groove is provided on the outer side of the temperature measuring plate on the upper surface of the lower pressing plate; both the first blind groove and the second blind groove are arranged towards the cavity.

5. The fixture according to any one of claims 1 to 4, characterized in that The material of the heat pipe is a non-oxide ceramic material.

6. The jig according to any one of claims 1 to 4, characterized in that The materials of the upper pressing plate, the lower pressing plate and the connecting component connecting the two are ceramic matrix composites with a high temperature resistance ≥ 1000 °C; the composite material is a composite material prepared from a long fiber woven preform, wherein the laying direction of the woven fabric forms a 90° angle with the heat conduction direction of the heat-insulating material.

7. The jig according to any one of claims 2 to 4, characterized in that The heat-insulating plate is selected from aerogel materials and / or fiber blankets; the material of the aerogel material is selected from at least one of carbon, zirconia, alumina and silica; the material of the fiber blanket is selected from at least one of carbon felt, zirconia, alumina and aluminosilicate.

8. The fixture according to any one of claims 1 to 4, characterized in that The material of the temperature measuring plate is selected from at least one of alumina, aluminosilicate and basalt.

9. The application of the fixture according to any one of claims 1 to 8 in the field of thermal performance testing of heat-insulating materials.

10. A method for testing the thermal performance of a heat insulation material, characterized in that, First, use the fixture according to any one of claims 1 to 8 to fix the heat-insulating material; then conduct a thermal performance test on the heat-insulating material.

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