Thermal shock performance test system for thermal protection materials

Abstract

The application discloses a thermal shock performance testing system of thermal protection material, and belongs to the technical field of thermal protection material performance testing equipment, and solves the technical problem that the thermal shock device in the prior art causes uneven heating of the sample when performing thermal shock performance testing in a clamping mode. The testing system comprises a thermal shock device and a temperature measuring device. The thermal shock device comprises a horizontal heating furnace. A hollow tubular graphite heating body is arranged in the horizontal heating furnace. First and second graphite sleeve pipes with the same structure are arranged on the outer surfaces of the left and right end portions of the tubular graphite heating body. The middle portion of the outer surface of the tubular graphite heating body corresponds to an isothermal heating zone. The thermal protection material sample is arranged in the isothermal heating zone through a sample bracket. The temperature measuring device is arranged outside the thermal shock device and is used for measuring the real-time temperature of the thermal protection material in the isothermal heating zone. The application realizes uniform heating when the thermal shock performance testing system of the thermal protection material is used.

Description

Technical Field

[0001] The present invention relates to the technical field of thermal protection material performance testing, and in particular to a thermal shock performance testing system for thermal protection materials. Background Art

[0002] Thermal protection material refers to a coating material coated on the surface of a substrate that can isolate the substrate material from direct contact with an oxidizing atmosphere.

[0003] Thermal protection materials play an important role in modern energy industry and aerospace industry, and have been widely used in gas turbines, spacecraft, rocket engines, nuclear reactors, submarines, thermal power generation and petrochemical equipment.

[0004] The thermal shock performance test of the oxidation coating refers to heating the sample to the test temperature in air, keeping it warm for a short time, cooling it to room temperature, performing a certain number of cycle tests, measuring the weight change of the sample, and conducting an antioxidant performance test in static air to determine the destruction time of the coating.

[0005] The results of existing thermal shock devices are complex and the reliability of the measurement results is low. Summary of the Invention

[0006] In view of the above analysis, the present invention aims to provide a thermal shock performance testing system for thermal protection materials to solve the problems of complex thermal shock devices and low reliability of measurement results in the prior art.

[0007] The purpose of the present invention is mainly achieved through the following technical solutions:

[0008] The present invention provides a thermal shock performance testing system for thermal protection materials, which is characterized by comprising a thermal shock device and a temperature measuring device;

[0009] The thermal shock device includes a horizontal heating furnace; a hollow tubular graphite heating body is disposed in the horizontal heating furnace; a first graphite sleeve and a second graphite sleeve of the same structure are bonded to the outer surfaces of the left and right ends of the tubular graphite heating body; an internal cavity area corresponding to the middle portion of the outer surface of the tubular graphite heating body serves as an isothermal heating zone; a thermal protection material sample is placed in the isothermal heating zone via a sample holder;

[0010] The temperature measuring device is arranged outside the thermal shock device and is used to measure the real-time temperature of the thermal protection material in the isothermal heating zone.

[0011] In one possible design, a third graphite sleeve is sleeved on the outer surface of the second graphite sleeve, and a fourth graphite sleeve is sleeved on the outer surface of the third graphite sleeve; the third graphite sleeve and the fourth graphite sleeve have the same structure and are both shorter than the first graphite sleeve and the second graphite sleeve;

[0012] The left ends of the tubular graphite heating body, the first graphite sleeve, and the third graphite sleeve are aligned; the right ends of the tubular graphite heating body, the second graphite sleeve, and the fourth graphite sleeve are aligned; the upper end of the third graphite sleeve is connected to the lead-in electrode, and the upper end of the fourth graphite sleeve is connected to the lead-out electrode;

[0013] The tubular graphite heating body is covered with a tubular insulation layer, the length of the tubular insulation layer is less than the length of the tubular graphite heating body, and the left and right ends of the tubular insulation layer correspondingly cover part of the first graphite sleeve and part of the second graphite sleeve.

[0014] In one possible design, the test system further includes a water cooling unit, which includes a water cooling sandwich structure, an incoming electrode water cooling structure, and an outgoing electrode water cooling structure;

[0015] The water-cooling sandwich structure is sleeved on the tubular heat-insulating layer, with a cavity between the two; the inlet electrode water-cooling structure is arranged outside the inlet electrode, and the outlet electrode water-cooling structure is arranged outside the outlet electrode;

[0016] A first cooling water pipe is provided in the water-cooled interlayer structure; a second cooling water pipe is provided in both the inlet electrode water-cooling structure and the outlet electrode water-cooling structure; the first cooling water pipe and the second cooling water pipe are connected;

[0017] A cooling water inlet is provided at the top of the horizontal heating furnace, and a cooling water outlet is provided at the bottom of the horizontal heating furnace; a first cooling water pipeline is connected to both the cooling water inlet and the cooling water outlet.

[0018] In one possible design, the test system further includes a water cooling supply unit, which includes a water storage tank, a refrigerator, a water supply pump, and a purification filter;

[0019] The water tank is provided with a water supply port and a water return port, and the water return port is connected to the cooling water outlet through a return pipe; the water introduced through the water supply port and the water return port is injected into the water tank after passing through the purification filter;

[0020] The refrigerator is used to cool the cooling water in the water tank, and the water pump pressurizes the cooled cooling water and delivers it to the cooling water inlet of the horizontal heating furnace through the water supply pipe.

[0021] In one possible design, an optical window is provided at the left end of the furnace body of the horizontal heating furnace, and a temperature measuring device is provided outside the optical window. The temperature measuring device can perform radiation temperature measurement on the thermal protection material sample on the sample holder through the optical window to obtain the real-time temperature of the thermal protection material sample.

[0022] In a possible design, a furnace cover is provided at the right end of the furnace body of the horizontal heating furnace. The furnace cover is opened and the heat protection material sample is placed in the isothermal heating zone using a sample holder.

[0023] In a possible design, the sample holder includes a pull rod and a sample tray. The sample tray includes an annular support frame. A plurality of support ribs are arranged horizontally on the inner wall of the annular support frame. The support ribs are used to support the thermal protection material sample.

[0024] In a possible design, a plurality of limiting members are provided on the annular support frame at equal intervals in the vertical direction; the plurality of limiting members are used to limit the movement of the thermal protection material sample.

[0025] In one possible design, the thermal insulation coating includes, from the inside out, a first thermal insulation layer, a low-density thermal insulation layer, and an aluminum silicate fiber layer;

[0026] The first heat-insulating layer is a composite material of carbon fiber and aluminum silicate ceramic matrix; the low-density heat-insulating layer includes a matrix material and a reinforcing material, the matrix material is a phenolic resin added with glass hollow microspheres, and the reinforcing material is glass fiber.

[0027] In one possible design, the heating temperature range of the horizontal heating furnace is 600-2200°C.

[0028] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0029] (1) The prior art uses a direct clamping heating method to heat the thermal protection material sample. Although the structure of this setting method is relatively simple, this heating method will cause the thermal protection material sample to be heated unevenly due to the direct clamping of the sample. Compared with the prior art, the present invention can ensure uniform heating of the thermal protection material sample by setting an isothermal heating zone, thereby better performing the thermal shock test of the thermal protection material. That is, after heating the sample to the test set temperature, it is kept warm for a certain period of time. After the heat is kept warm, it is cooled to the set temperature or room temperature. Multiple cycle tests are carried out to measure the number of experiments when the thermal protection material is destroyed.

[0030] (2) The present invention can reduce the heat dissipation in the left end region and the right end region of the tubular graphite heating body by arranging the first graphite sleeve and the second graphite sleeve at both ends of the outer surface of the tubular graphite heating body.

[0031] (3) The present invention further reduces heat dissipation from the left and right ends of the tubular graphite heating element by providing a third graphite sleeve outside the first graphite sleeve and a fourth graphite sleeve outside the second graphite sleeve, thereby further reducing heat loss at both ends of the tubular graphite heating element. Furthermore, the third and fourth graphite sleeves can also secure and support the tubular graphite heating element, allowing it to be fixed in the middle of the horizontal heating furnace.

[0032] (4) When the thermal shock device provided by the present invention is subjected to an air environment performance test, the test temperature is 600-2200°C; the temperature control unit can be used to set the heating, insulation and cooling times, with a temperature control accuracy of ±10°C; in addition, multiple cycle tests can be carried out and the number of cycles can be recorded.

[0033] In the present invention, the above-mentioned technical solutions can be combined with each other to achieve more preferred combination solutions. Other features and advantages of the present invention will be described in the subsequent description, and some advantages will become apparent from the description or be understood through practice of the present invention. The objectives and other advantages of the present invention can be achieved and obtained through the embodiments of the description and the contents particularly pointed out in the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The accompanying drawings are only for the purpose of illustrating particular embodiments and are not to be considered limiting of the present invention. Like reference symbols denote like parts throughout the drawings.

[0035] Figure 1 Schematic diagram of the structure of the horizontal heating furnace provided by the present invention; wherein, a-inner diameter of the tubular graphite heating body; b-outer diameter of the tubular graphite heating body; c-outer diameter of the water-cooling clamping structure; d-diameter of the two end covers of the horizontal heating furnace; e-length of the isothermal heating zone; f-length of the furnace body; g-length between the two end covers of the horizontal heating furnace.

[0036] Figure 2 A schematic structural diagram of the sample bracket provided by the present invention;

[0037] Figure 3 This is a structural schematic diagram of the water cooling supply unit provided by the present invention.

[0038] Figure 4 Schematic diagram of the structure of the sample moving and weighing unit.

[0039] Reference numerals:

[0040] 1- tubular graphite heating element; 2- first graphite sleeve; 3- second graphite sleeve; 4- third graphite sleeve; 5- fourth graphite sleeve; 6- isothermal heating zone; 7- tubular insulation layer; 8- water-cooled sandwich structure; 9- water-cooled structure for inlet electrode; 10- water-cooled structure for outlet electrode; 11- inlet electrode; 12- outlet electrode; 13- cooling water inlet; 14- cooling water outlet; 15- temperature measuring device; 16- optical window; 17- furnace cover; 18- Sample bracket; 19-insulation layer support block; 20-annular support frame; 21-support ribs; 22-refrigeration machine; 23-water pump; 24-water storage tank; 25-water inlet; 26-water return port; 27-filter; 28-counterweight; 29-pull rod; 30-support frame; 31-first lifting strap; 32-electronic balance; 33-balance tray; 34-balance hook; 35-second lifting strap; 36-clamp; 37-thermal protection material sample. DETAILED DESCRIPTION

[0041] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, wherein the accompanying drawings constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.

[0042] The thermal shock performance test system for thermal protective materials refers to heating the sample to the test temperature in air, keeping it warm for a short time, and then cooling it to room temperature. A certain number of cycle tests are performed to measure the weight change of the sample and conduct an antioxidant performance test in static air to determine the destruction time of the coating.

[0043] Test temperature: 600-2200℃, temperature control accuracy: ±10℃.

[0044] The present invention provides a thermal shock performance testing system for thermal protection materials, such as Figure 1 As shown, the test system includes a thermal shock device and a temperature measuring device 15; the thermal shock device includes a horizontal heating furnace; a hollow tubular graphite heating body 1 is provided in the horizontal heating furnace; the outer surfaces of the left and right ends of the tubular graphite heating body 1 are fitted with a first graphite sleeve 2 and a second graphite sleeve 3 of the same structure, and the internal cavity area corresponding to the middle part of the outer surface of the tubular graphite heating body 1 is the isothermal heating zone 6; the thermal protection material sample 37 is placed in the isothermal heating zone 6 through the sample holder 18; the temperature measuring device 15 is provided outside the thermal shock device, and the temperature measuring device 15 is used to measure the real-time temperature of the thermal protection material in the isothermal heating zone 6.

[0045] Specifically, the thermal shock device of the present invention adopts a horizontal thermal shock heating furnace, in which a horizontally placed hollow tubular graphite heating body 1 is provided at the center of the furnace body of the horizontal thermal shock heating furnace. The outer surface of the left end of the tubular graphite heating body 1 is provided with a first graphite sleeve 2, and the outer surface of the right end thereof is provided with a second graphite sleeve 3. The first graphite sleeve 2 and the second graphite sleeve 3 are both provided on the tubular graphite heating body 1 in a fitting manner. The inner cavity area corresponding to the first graphite sleeve 2 and the second graphite sleeve 3 on the tubular graphite heating body 1 is The left end area and the middle part of the outer surface of the tubular graphite heating body 1 (i.e., the area not covered by the first graphite sleeve 2 and the second graphite sleeve 3) are the isothermal heating zone 6. When the first graphite sleeve 2 and the second graphite sleeve 3 are energized, the tubular graphite heating body 1 is also energized and starts to heat. After heating for a certain period of time, the temperature in the isothermal heating zone 6 is more uniform than the temperature in the left end area and the right end area, thereby ensuring uniform heating of the thermal protection material sample 37.

[0046] It should be noted that the thermal conductivity of graphite is exactly the opposite of that of general metal materials. It has a very high thermal conductivity coefficient at room temperature, but when the temperature rises, the thermal conductivity coefficient decreases. At extremely high temperatures, graphite even becomes a thermal insulator. Based on this characteristic of graphite, the present invention can reduce the heat dissipation in the left end area and the right end area of ​​the tubular graphite heating body 1 by arranging the first graphite sleeve 2 and the second graphite sleeve 3 at both ends of the outer surface of the tubular graphite heating body 1.

[0047] The prior art uses direct clamping heating to heat the thermal protection material sample 37. Although this arrangement is relatively simple in structure, the direct clamping of the sample can result in uneven heating of the thermal protection material sample 37. Compared to the prior art, the present invention, by providing an isothermal heating zone 6, ensures uniform heating of the thermal protection material sample 37, thereby better enabling thermal shock testing of the thermal protection material.

[0048] In order to further reduce the heat dissipation at the first graphite sleeve 2 and the second graphite sleeve 3, the outer surface of the second graphite sleeve 3 of the present invention is sleeved with a third graphite sleeve 4, and the outer surface of the third graphite sleeve 4 is sleeved with a fourth graphite sleeve 5; the third graphite sleeve 4 and the fourth graphite sleeve 5 have the same structure and the length of both are smaller than the first graphite sleeve 2 and the second graphite sleeve 3; the left ends of the tubular graphite heating body 1, the first graphite sleeve 2 and the third graphite sleeve 4 are aligned; the right ends of the tubular graphite heating body 1, the second graphite sleeve 3 and the fourth graphite sleeve 5 are aligned; the top of the third graphite sleeve 4 is connected to the introduction electrode 11, and the top of the fourth graphite sleeve 5 is connected to the extraction electrode 12; the tubular graphite heating body 1 is outer-circuited with a tubular thermal insulation layer 7, the length of the tubular thermal insulation layer 7 is smaller than the length of the tubular graphite heating body 1, and the left and right ends of the tubular thermal insulation layer 7 correspondingly cover part of the first graphite sleeve 2 and part of the second graphite sleeve 3.

[0049] Specifically, if Figure 1 As shown, the present invention provides a third graphite sleeve 4 on the outside of the first graphite sleeve 2, and a fourth graphite sleeve 5 on the outside of the second graphite sleeve 3, wherein the third graphite sleeve 4 is connected to the introduction electrode 11, and the fourth graphite sleeve 5 is connected to the extraction electrode 12. By providing the introduction electrode 11 and the extraction electrode 12, each graphite sleeve is energized, thereby heating the tubular graphite heating body 1, and finally forming an isothermal heating zone 6. In addition, a tubular thermal insulation layer 7 is provided on the outer surface of the tubular graphite heating body 1, and the length of the tubular thermal insulation layer 7 is less than the length of the tubular graphite heating body 1. A certain gap is provided between the tubular thermal insulation layer 7 and the outer surface of the tubular graphite heating body 1. The provision of the tubular thermal insulation layer 7 and the provision of a certain gap between the tubular thermal insulation layer 7 and the tubular graphite heating body 1 can reduce the heat loss in the isothermal heating zone 6.

[0050] Compared to the prior art, the present invention further reduces heat dissipation from the left and right ends of the tubular graphite heating element 1 by providing a third graphite sleeve 4 on the outside of the first graphite sleeve 2 and a fourth graphite sleeve 5 on the outside of the second graphite sleeve 3, thereby further reducing heat loss at both ends of the tubular graphite heating element 1. Furthermore, the provision of the third and fourth graphite sleeves 4, 5 also secures and supports the tubular graphite heating element 1, allowing it to be fixed in the middle of the horizontal heating furnace.

[0051] In order to cool the horizontal thermal shock heating furnace and the introduction electrode 11 and the lead-out electrode 12, the test system of the present invention also includes a water cooling unit, which includes a water-cooling interlayer structure 8, a water-cooling structure 9 for the introduction electrode 11 and a water-cooling structure 10 for the lead-out electrode 12; the water-cooling interlayer structure 8 is sleeved on the tubular insulation layer 7, and a cavity is separated therebetween; the water-cooling structure 9 for the introduction electrode 11 is arranged on the introduction electrode 11, and the water-cooling structure 10 for the lead-out electrode 12 is arranged on the lead-out electrode 12; a first cooling water pipe is provided in the water-cooling interlayer structure 8; a second cooling water pipe is provided in the water-cooling structure 9 for the introduction electrode 11 and the water-cooling structure 10 for the lead-out electrode 12; the first cooling water pipe and the second cooling water pipe are connected; a cooling water inlet is provided at the top of the horizontal heating furnace, and a cooling water outlet 14 is provided at the bottom of the horizontal heating furnace; the first cooling water pipe is connected to the cooling water inlet 13 and the cooling water outlet 14.

[0052] Specifically, the water-cooling unit of the present invention includes a water-cooling interlayer structure 8, a water-cooling structure 9 for introducing an electrode 11, and a water-cooling structure 10 for leading out an electrode 12, wherein a first cooling water pipe is provided in the water-cooling interlayer structure 8, and a second cooling water pipe is provided in the water-cooling structure 9 for introducing an electrode 11 and the water-cooling structure 10 for leading out an electrode 12, and the first cooling water pipe and the second cooling water pipe are interconnected and are both directly or indirectly connected to the cooling water inlet and the cooling water outlet 14 to cool the horizontal heating furnace.

[0053] It should be noted that if Figure 3 As shown, the test system of the present invention also includes a water-cooling supply unit, which includes a water tank 24, a refrigerator 22, a water supply pump 23 and a purification filter 27; the water tank 24 is provided with a water supply port 25 and a return water port 26, and the return water port 26 is connected to the cooling water outlet 14 through a return water pipe; the water introduced through the water supply port 25 and the return water port 26 is injected into the water tank 24 after passing through the purification filter 27; the refrigerator 22 is used to cool the cooling water in the water tank 24, and the water supply pump 23 pressurizes the cooling water after the cooling treatment and transports it to the cooling water inlet 13 of the horizontal heating furnace through the water supply pipe.

[0054] It should be noted that an optical window 16 is provided at the left end of the furnace body of the horizontal heating furnace, and a temperature measuring device 15 is provided outside the optical window 16. The temperature measuring device 15 can perform radiation temperature measurement on the thermal protection material sample 37 on the sample holder 18 through the optical window 16 to obtain the real-time temperature of the thermal protection material sample 37; a furnace cover 17 is provided at the right end of the furnace body of the horizontal heating furnace. The furnace cover 17 is opened, and the thermal protection material sample 37 is placed in the isothermal heating zone 6 using the sample holder 18.

[0055] In order to facilitate the movement of samples, Figure 2As shown, the sample holder 18 of the present invention includes a pull rod 29 and a sample tray. The sample tray includes an annular support frame 20. A plurality of support ribs 21 are arranged horizontally on the inner wall of the annular support frame 20. The support ribs 21 are used to support the thermal protection material sample 37. On the annular support frame 20, a plurality of limit members are provided at equal intervals in the vertical direction. The plurality of limit members are used to limit the movement of the thermal protection material sample 37.

[0056] Exemplarily, as shown in the figure, three support ribs are provided on the inner wall of the annular support frame 20 of the present invention, and the three support ribs are evenly arranged on the inner wall of the annular support frame 20, and the length of the three support ribs is less than the radius of the annular support frame 20. The present invention can support the thermal protection material sample 37 on the one hand by setting three support ribs 21, and on the other hand, it can ensure that the bottom of the thermal protection material sample 37 is heated evenly; in addition, three limit members are evenly arranged in the vertical direction on the annular support frame 20. For example, the limit members are limit bars. By setting the limit bars, the thermal protection material can be prevented from relative displacement with each rib when entering or moving out of the isothermal heating zone 6.

[0057] It should be noted that the material of the sample holder 18 is graphite.

[0058] Alternatively, as an alternative to the sample holder 18 , the testing system of the present invention further comprises a sample moving and weighing unit, which is disposed in the tubular graphite heating body 1 and is capable of placing the clamped thermal protection material sample 37 in the isothermal heating zone 6 .

[0059] like Figure 4 As shown, the above-mentioned sample moving and weighing unit includes a columnar pull rod 29, and a counterweight block is provided on the first end of the pull rod 29 (that is, the end close to the furnace cover 17); a 7-shaped support frame 30 perpendicular to it is fixed on the second end of the pull rod 29, and the 7-shaped support frame 30 is arranged in the vertical direction. A first lifting belt 31 is provided at the top of the 7-shaped support frame 30, and a balance tray 33 is fixed below the first lifting belt 31. An electronic balance 32 is provided on the balance tray 33, and a balance hook 34 is provided at the bottom of the balance tray 33. The balance hook 34 is fixedly connected to a clamp 36 through a second lifting belt 35, and the clamp 36 is used to clamp the thermal protection material sample 37.

[0060] When conducting a thermal shock performance test on a thermal protection material, it is necessary to measure the weight of the sample multiple times in real time. In the present invention, the sample moving and weighing unit does not need to move the sample outside the horizontal heating furnace for weight measurement, and the real-time weight measurement of the sample can be completed in the furnace.

[0061] It should be noted that, because the second end of the pull rod 29 is provided with components such as an electronic balance 32 and a balance tray 33, in order to prevent the pull rod 29 from shaking and affecting the accuracy of the test results, the present invention provides a counterweight block 28 at the first end of the pull rod 29. The counterweight block 28 is provided with a concave cavity, which is used to clamp on the pull rod 29 to fix the pull rod 29.

[0062] In order to reduce heat dissipation, the thermal insulation coating includes a first thermal insulation layer, a low-density thermal insulation layer and an aluminum silicate fiber layer from the inside to the outside; the first thermal insulation layer adopts a carbon fiber and aluminum silicate ceramic-based composite material; the low-density thermal insulation layer includes a matrix material and a reinforcing material, the matrix material is a phenolic resin with added glass hollow microspheres, and the reinforcing material is glass fiber.

[0063] Compared with the prior art, the present invention can greatly reduce the amount of heat transferred outward from the tubular graphite heating body 1 by setting a first thermal insulation layer. On the other hand, by setting a low-density thermal insulation layer outside the first thermal insulation layer, heat transfer can be further reduced. On this basis, a layer of aluminum silicate fiber is set, which can not only further reduce heat transfer and thus reduce heat loss, but also, aluminum silicate fiber is also an insulator, which can reduce the setting of the insulation layer, thereby simplifying the device structure.

[0064] It should be noted that, in order to support the tubular insulation layer 7, two insulation layer support blocks 19 are provided between the tubular insulation layer 7 and the water-cooled interlayer structure 8. The two support blocks have the same structure and are both located at the bottom of the horizontal heating furnace.

[0065] It should be noted that the test system of the present invention also includes a temperature control unit, which uses a PID algorithm for temperature control. The temperature control unit is connected to the horizontal vacuum heating furnace, which can ensure that the horizontal vacuum heating furnace can realize thermal shock testing: that is, the sample is heated to the test set temperature and then kept warm for a certain period of time. After keeping warm, it is cooled to the set temperature or room temperature, and multiple cycle tests are carried out to measure the number of experiments when the thermal protection material is damaged.

[0066] The main technical indicators of the horizontal heating furnace of the present invention are as follows:

[0067] Overall dimensions: 500mm (length) × 300mm (diameter); heating zone: 400mm (length) × 30mm (diameter); isothermal zone: 100mm (length) × 30mm (diameter); heating power: 5kW.

[0068] It should also be noted that the sample size of the present invention is: 10mm×1mm×70mm; or 5mm×3mm×70mm square cylinder; or Φ5mm×70mm round (elliptical) cylinder. Sample weight: 10g.

[0069] It should be noted that the temperature measuring device 15 of the present invention adopts a colorimetric pyrometer. The specific parameters of the colorimetric pyrometer are shown in Table 1 below.

[0070] Table 1 Technical parameters of colorimetric pyrometer

[0071] model HIT-3 Measuring temperature range 1000—2500℃ Temperature resolution 0.5℃ Temperature measurement accuracy 0.5％ Minimum test target <![CDATA[2mm 2 ]]> Minimum test distance 1000mm wavelength 0.9μm

[0072] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with this technical field within the technical scope disclosed by the present invention should be covered by the scope of protection of the present invention.

Claims

1. A thermal shock performance testing system for thermal protection materials, characterized in that: Includes thermal shock device and temperature measuring device; The thermal shock device includes a horizontal heating furnace; a horizontally placed hollow tubular graphite heating body is provided in the horizontal heating furnace; a first graphite sleeve and a second graphite sleeve of identical structure are fitted on the outer surfaces of the left and right ends of the tubular graphite heating body, a third graphite sleeve is sleeved on the outer surface of the second graphite sleeve, and a fourth graphite sleeve is sleeved on the outer surface of the third graphite sleeve; the third and fourth graphite sleeves have identical structures and are shorter than the first and second graphite sleeves; an internal cavity area corresponding to the middle portion of the outer surface of the tubular graphite heating body is an isothermal heating zone; a thermal protection material sample is placed in the isothermal heating zone via a sample holder; The sample holder includes a pull rod and a sample tray, and the sample tray includes an annular support frame, and a plurality of support ribs are arranged on the inner wall of the annular support frame in a horizontal direction, and the support ribs are used to support the thermal protection material sample; on the annular support frame, a plurality of limit members are provided at equal intervals in the vertical direction; the plurality of limit members are used to limit the movement of the thermal protection material sample; The temperature measuring device is arranged outside the thermal shock device and is used to measure the real-time temperature of the thermal protection material in the isothermal heating zone.

2. The thermal shock performance testing system for thermal protection materials according to claim 1, characterized in that: The left ends of the tubular graphite heating body, the first graphite sleeve, and the third graphite sleeve are aligned; the right ends of the tubular graphite heating body, the second graphite sleeve, and the fourth graphite sleeve are aligned; the upper portion of the third graphite sleeve is connected to the lead-in electrode, and the upper portion of the fourth graphite sleeve is connected to the lead-out electrode; The tubular graphite heating body is covered with a tubular insulation layer, the length of the tubular insulation layer is shorter than the length of the tubular graphite heating body, and the left and right ends of the tubular insulation layer correspondingly cover part of the first graphite sleeve and part of the second graphite sleeve.

3. The thermal shock performance testing system for thermal protection materials according to claim 2, characterized in that: The test system further includes a water cooling unit, which includes a water cooling interlayer structure, an inlet electrode water cooling structure, and an outlet electrode water cooling structure; The water-cooling sandwich structure is sleeved on the tubular heat-insulating layer, with a cavity between the two; the lead-in electrode water-cooling structure is arranged outside the lead-in electrode, and the lead-out electrode water-cooling structure is arranged outside the lead-out electrode; A first cooling water pipe is provided in the water-cooled interlayer structure; a second cooling water pipe is provided in both the inlet electrode water-cooling structure and the outlet electrode water-cooling structure; the first cooling water pipe and the second cooling water pipe are connected; A cooling water inlet is provided at the top of the horizontal heating furnace, and a cooling water outlet is provided at the bottom of the horizontal heating furnace; the first cooling water pipe is connected to both the cooling water inlet and the cooling water outlet.

4. The thermal shock performance testing system for thermal protection materials according to claim 3, characterized in that: The test system further includes a water-cooling supply unit, which includes a water storage tank, a refrigerator, a water supply pump, and a purification filter; The water storage tank is provided with a water supply port and a water return port, and the water return port is connected to the cooling water outlet through a return pipe; the water introduced through the water supply port and the water return port is injected into the water storage tank after passing through the purification filter; The refrigerator is used to cool the cooling water in the water storage tank, and the water supply pump pressurizes the cooling water after the cooling treatment and delivers it to the cooling water inlet of the horizontal heating furnace through a water supply pipe.

5. The thermal shock performance testing system for thermal protection materials according to claim 4, characterized in that: An optical window is provided at the left end of the furnace body of the horizontal heating furnace, and the temperature measuring device is provided outside the optical window. The temperature measuring device can perform radiation temperature measurement on the thermal protection material sample on the sample holder through the optical window to obtain the real-time temperature of the thermal protection material sample.

6. The thermal shock performance testing system for thermal protection materials according to claim 5, characterized in that: A furnace cover is provided at the right end of the furnace body of the horizontal heating furnace. The furnace cover is opened, and the heat protection material sample is placed in the isothermal heating zone using the sample bracket.

7. The thermal shock performance testing system for thermal protection materials according to any one of claims 1 to 6, characterized in that: The heating temperature range of the horizontal heating furnace is 600-2200°C.

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