High-temperature test method and device for tensile force of ceramic fiber

Abstract

The invention discloses a ceramic fiber filament tension high-temperature test method and device. The method comprises the following steps: injecting glue to two ends of a plurality of parallel to-be-detected fiber bundles to obtain a to-be-detected fiber sample; placing the to-be-detected part in a high-temperature heating device of the ceramic fiber filament tension high-temperature testing device; performing programmed heating on the part to be detected through an induction heater of the high-temperature heating device, starting a cooling system positioned between the induction heater and the tension clamp, filling atmosphere into the high-temperature testing device through the atmosphere maintaining system, so that fibers are tested in different atmosphere environments, starting the cooling system, and starting the cooling system; the tensile force high-temperature testing device is heated to the set temperature and tensile force speed, the temperature can be rapidly increased to reach the environment state basically consistent with the application environment, the constant temperature can be rapidly kept, the situation that the temperature is rapidly changed can be avoided, and the tensile force test is carried out on the fiber at the set constant temperature; the influence of temperature fluctuation on the test performance is avoided, so that the performance of the fiber is accurately and truly measured.

Description

Technical Field

[0001] The invention belongs to the technical field of fiber high-temperature testing, and in particular relates to a method and device for testing the tensile strength of ceramic fibers at high temperatures. Background Art

[0002] Ceramic fiber is an important inorganic fiber material with good thermal stability, high temperature resistance, ablation resistance, oxidation resistance, and high neutron absorption ability. When ceramic fibers and their composite materials are used in new hypersonic aircraft, they must face harsh and severe aerodynamic heating environments, and the total amount of aerodynamic heating they are subjected to is very large. At present, the high-temperature performance evaluation of ceramic fiber bundles adopts the method of first heating the sample to the target temperature and then heat treating it, and then cooling it to room temperature for tensile testing; the general method is to heat it to the target temperature and keep it warm for testing. The heating element uses a precious metal heating coil. The metal heating coil heats up slowly, and the test is conducted by heating it first and then keeping it warm. During this process, the temperature changes rapidly, and the surface and internal structure of the fiber bundle undergo secondary irreversible changes due to heat. It cannot accurately and truly characterize the changes in the mechanical properties of the fiber and its composite materials under high temperature conditions. In addition, in an aerobic environment, precious metal coils are prone to oxidation, which intensifies rust and the characterization cost is high.

[0003] Therefore, there is an urgent need for a method and device for characterizing fiber tension in a high-temperature state, so as to enable the characterized fiber to quickly reach a stable temperature and avoid the problem of secondary irreversible changes in the surface and internal structure of the fiber bundle due to heat during the process of reaching the detection temperature. Summary of the Invention

[0004] In response to the above problems, the present invention designs a high-temperature tensile testing method for ceramic fiber yarns, which includes the following steps: Step 1: injecting glue at both ends of a plurality of parallel fiber bundles to be tested to obtain a fiber sample to be tested;

[0005] The fiber sample to be tested includes a clamping portion located at both ends and a portion to be tested located between the two ends;

[0006] The clamping portion includes a plurality of fiber bundles bonded together as a whole; the portion to be detected includes a plurality of fiber bundles arranged in parallel;

[0007] Step 2: Place the part to be tested in a high-temperature heating device of a ceramic fiber tension high-temperature testing device;

[0008] Fixing the clamping part by a tension clamp;

[0009] Step 3: The induction heater of the high-temperature heating device is used to program the temperature of the part to be tested. When the first preset temperature is reached, the tensile testing device is turned on to perform a tensile test on the part to be tested. When the second preset temperature is reached, the corresponding gas is introduced into the area around the part to be tested. When the third preset temperature is reached, the cooling system between the induction heater and the tensile clamp is turned on.

[0010] When the force-displacement curve shows the maximum force value during the stretching process of the fiber at the tested part, the maximum force on the force-displacement curve is taken as its breaking force, and the test temperature at the time of fracture is taken as the test temperature under the breaking force.

[0011] Compared with the prior art, the beneficial effects of the present invention are as follows: by placing the fiber in a high-temperature heating device, the fiber with glue injected at both ends is clamped with a clamp to increase the friction between the fiber and the clamp, and the fiber is prevented from slipping out of the clamp during the test. The atmosphere is filled into the high-temperature test device through the atmosphere maintenance system, so that the fiber is tested under different atmosphere environments, and the cooling system is turned on to raise the tensile high-temperature test device to the set temperature and tensile speed, which can quickly increase the temperature to an environmental state basically consistent with the application environment. After reaching the measured temperature value, it can quickly maintain a constant temperature, which can avoid the situation where the temperature changes drastically, so that the fiber is tensile tested at a set constant temperature, and the temperature fluctuation is avoided. The impact of test performance caused by temperature fluctuations, thereby accurately and truly measuring the performance of the fiber; finally, the ceramic fiber tensile high-temperature test method realizes the characterization of the fiber for detection, and quickly reaches a stable temperature during the detection process, avoiding the problem of secondary irreversible changes in the surface and internal structure of the fiber bundle due to heat during the process of reaching the detection temperature.

[0012] Furthermore, the preparation method of the fiber sample to be tested includes the following steps: winding the pretreated fiber to be tested on the surface of a winding frame; placing the two ends of the winding frame in a slurry box, which contains slurry; the fibers on the surfaces of the two ends of the winding frame are impregnated with the slurry, while the fibers located in the middle of the winding frame are not impregnated with the slurry; moving the winding frame into a heating device for heating, so that the fibers at both ends of the winding frame are bonded into an integral fiber bundle; the fibers in the middle of the winding frame are parallelly arranged fibers; and then shearing to obtain the fiber sample to be tested; preferably, the pretreatment time (2 to 3 minutes) and the curing temperature are less than 200°C, the purpose of which is to bundle the fibers and effectively avoid slippage when clamped by a clamp; the slurry can be selected from resin curing agents such as polyurethane, epoxy resin, and phenolic resin.

[0013] The beneficial effect of adopting the above-mentioned further technical solution is that by winding the fiber bundle in a winding frame and placing the winding frame in a slurry box, the length of the slurry-soaked fibers at both ends of the fiber bundle is made consistent, and by drying and then cutting, multiple sections of test fibers with glue injected at both ends can be easily obtained.

[0014] Furthermore, when the induction heater of the high-temperature heating device is used to perform a programmed temperature increase on the part to be detected, the heat preservation device provided on the induction heater is turned on to perform a programmed temperature preservation;

[0015] Preferably, when the temperature of the part to be detected is programmed to rise by the induction heater of the high-temperature heating device, the heat preservation device provided outside the induction heater is turned on to perform programmed heat preservation, and the demagnetization device located inside the induction heater is turned on.

[0016] The beneficial effect of adopting the above-mentioned further technical solution is that: by turning on the induction heater and the insulation device at the same time, the temperature can be quickly increased. After reaching the measured temperature value, the constant temperature can be quickly maintained, which can avoid sudden temperature changes and enable the fiber to be tensile tested at a constant temperature. After turning on the induction heater, turning on the demagnetization device at the same time can eliminate the magnetic field around the fiber to be tested, thereby avoiding the metal impurities inside the fiber during the fiber testing process, which are affected by electromagnetic fields and generate eddy currents, thereby affecting the test performance.

[0017] A ceramic fiber yarn tensile high-temperature testing device includes two tensile testing sensing devices, a high-temperature heating device, and a gas replacement device; the tensile testing sensing device includes a stretching device, a tensile sensor, and a tensile clamp; a high-temperature heating device is provided between the two tensile clamps, and the high-temperature heating device includes an induction heater, an insulating layer, and a shell; a cooling system is provided between the induction heater and the tensile clamp;

[0018] The induction heater includes a first electric heating coil and a first metal shell, wherein the first metal shell is provided with a heating accommodating cavity, and the part to be detected is located in the heating accommodating cavity;

[0019] The gas replacement device allows the gas to pass through the cooling system, the housing, and the insulation layer and enter the insulation layer.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows: an induction heater is provided in the high-temperature heater, and electromagnetic heating is generated by the induction heater to quickly increase the temperature in the heating chamber. An insulating layer is provided to prevent heat loss inside the heating chamber. When the appropriate temperature is reached, the tensile clamp is used to perform a tensile test on the part of the fiber to be tested; a water cooling system is added to effectively improve the service life and reliability of equipment components; a gas replacement device is provided to meet the testing requirements under different environmental atmospheres, and different atmospheres such as nitrogen, argon, and helium can be allowed to enter the heating chamber, and corrosion of the equipment and related materials in a high-temperature environment can be avoided; finally, the characterization fiber is tested by a ceramic fiber tensile high-temperature test device, and a stable temperature is quickly reached during the test process, avoiding the problem of secondary irreversible changes in the surface and internal structure of the fiber bundle due to heat during the process of reaching the test temperature.

[0021] Furthermore, the gas replacement device includes an air inlet, an air outlet, an air inlet device and an air outlet device, the heating accommodating chamber is connected to the air inlet device through the air inlet, and the heating accommodating chamber is connected to the air outlet device through the air outlet; the air inlet device includes a gas storage tank and an air inlet pipeline, and the air outlet device includes an air outlet pipeline.

[0022] The beneficial effect of adopting the above further technical solution is that the atmosphere enters the heating accommodating chamber from the air inlet through the air inlet device, and the atmosphere is discharged from the air outlet through the air outlet device.

[0023] Furthermore, the outer shell is sleeved on the outside of the first electric heating coil; the first electric heating coil is sleeved on the outer surface of the insulating layer; the insulating layer is sleeved on the outside of the first metal shell; the insulating layer is one of quartz glass, alumina ceramics, boron nitride ceramics, etc.

[0024] The beneficial effect of adopting the above further technical solution is that electromagnetic induction heating is performed through the first electric heating coil outside the insulation layer and the first metal shell inside the insulation layer, and temperature loss is avoided.

[0025] Furthermore, the high-temperature heating device further includes a heat preservation device, which includes a second electric heating coil and a second metal shell; the second metal shell is provided with a heat preservation cavity, and the induction heater is located in the heat preservation cavity;

[0026] The outer shell is sleeved on the outside of the second electric heating coil; the second electric heating coil is sleeved on the outer surface of the insulating layer; and the insulating layer is sleeved on the second metal shell.

[0027] The beneficial effect of adopting the above-mentioned further technical solution is that by arranging a heat preservation device outside the induction heater, the second electric heating coil and the second metal shell are heated by electromagnetic induction, which can accelerate the heating speed and avoid rapid temperature loss.

[0028] Furthermore, the high-temperature heating device further includes a demagnetization device, which includes a third electric heating coil and a third metal shell; the third metal shell is provided with a demagnetization accommodating chamber, the demagnetization device is located in the heating accommodating chamber, and the part to be detected is located in the demagnetization accommodating chamber;

[0029] The outer shell is sleeved outside the second electric heating coil; the second electric heating coil is sleeved on the outer surface of the insulation; the insulation layer is sleeved outside the second metal shell;

[0030] The first metal conductor, the second metal conductor and the third metal conductor are made of high-purity graphite, metal iridium gold, molybdenum gold, tungsten gold and alloys thereof.

[0031] The beneficial effect of adopting the above-mentioned further technical solution is that: by arranging a demagnetization device in the heating accommodating chamber, the third electric heating coil and the third metal conductor generate opposite magnetic fields, thereby eliminating the magnetic field around the part of the fiber to be tested, and avoiding the generation of eddy currents due to electromagnetic influence caused by the presence of metal impurities inside the fiber during the fiber testing process, thereby affecting the test performance.

[0032] Furthermore, the minimum distance between the third electric heating coil and the first electric heating coil is greater than or equal to 60-70 cm.

[0033] The beneficial effect of adopting the above-mentioned further technical solution is that: by setting the minimum distance between the third electric heating coil and the first electric heating coil to be greater than or equal to 60-70 cm, there is no magnetic field around the fiber, and at the same time, it does not affect the magnetic field around the first electric heating coil and the second electric heating coil, thereby avoiding electromagnetic induction from affecting the tested fiber performance and avoiding the reverse magnetic field from affecting the heating of the first electric heating coil and the second electric heating coil.

[0034] A device for preparing fiber samples to be tested includes a winding frame and an end bundling device, the bundling device includes two slurry boxes and a sliding device slidably connected to the slurry boxes, the slurry boxes are provided with horizontal slide rails, and the sliding device is provided with a slide groove matching the horizontal slide rails; the two ends of the winding frame are respectively located in the two slurry boxes, and the middle part of the winding frame is located outside the slurry boxes; the slurry boxes are provided with a liquid injection hole.

[0035] The slurry box slides on the sliding device to achieve adjustable horizontal distance between the two slurry boxes; the winding frame is detachably located between the two slurry boxes.

[0036] The slurry box includes an upper box body, a lower box body, and a blocking device connecting the upper box body and the lower box body; the upper box body is provided with a vertical slide rail, and the sliding device is provided with a slide groove matching the vertical slide rail; a side surface of the upper box body and a side surface of the lower box body are arranged opposite to each other to form a gap matching the winding frame;

[0037] When the end of the winding frame is located between the upper and lower parts of the box body, the blocking device, the upper and lower parts of the box body form a closed liquid storage cavity, and the end of the winding frame is located in the liquid storage cavity.

[0038] Compared with the prior art, the beneficial effects of the present invention are as follows: by arranging a horizontal slide rail of the slurry box and cooperating with the slide groove of the sliding device to slide, the horizontal distance between the two slurry boxes can be adjusted; by arranging an upper part and a lower part of the box body in the slurry box, the winding frame with the fiber placed is placed on the upper part of the box body, and the vertical slide rail of the upper part of the box body and the slide groove of the sliding device slide downward to cooperate, so that the winding frame with the fiber placed is placed on the lower part of the box body filled with slurry; the upper part of the box body and the lower part of the box body are surrounded by a closed liquid storage chamber through the barrier device, so that the two ends of the winding frame are immersed in the slurry, thereby making the two ends of the fiber immersed in the slurry. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] 1. Tensile device; 2. Tensile sensor; 3. Tensile clamp; 4. Induction heater;

[0040] 5. Insulation layer; 6. Outer shell; 7. Cooling system; 8. First electric heating coil; 9. First metal shell; 10. Heating chamber; 11. Air inlet; 12. Air outlet; 13. Air inlet device; 14. Air outlet device; 15. Heat preservation device; 16. Second electric heating coil; 17. Second metal shell; 18. Heat preservation chamber; 19. Demagnetization device; 20. Third electric heating coil; 21. Third metal shell; 22. Demagnetization chamber; 23. Clamping part; 24. Part to be detected; 25. Winding frame; 26. Upper part of the box body; 27. Lower part of the box body; 28. Sliding device; 29. ​​Infrared thermometer.

[0041] Figure 1 This is a main cross-sectional view of a first embodiment of a high-temperature testing device for tensile strength of fiber bundles;

[0042] Figure 2 This is a main cross-sectional view of a second embodiment of a high-temperature testing device for tensile strength of fiber bundles;

[0043] Figure 3 This is a main cross-sectional view of a third embodiment of a fiber bundle tension high-temperature testing device;

[0044] Figure 4 This is the front view of the device for making the fiber sample to be tested. DETAILED DESCRIPTION

[0045] In order to make the objectives, technical solutions and advantages of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention.

[0046] Example 1:

[0047] like Figure 1 and Figure 4As shown: This embodiment provides a ceramic fiber yarn tensile high-temperature test method: comprising the following steps: Step 1: injecting glue at both ends of a plurality of parallel fiber bundles to be tested to obtain a fiber sample to be tested; the fiber sample to be tested includes a clamping portion 23 located at both ends and a to-be-tested portion 24 located between the two ends; the clamping portion 23 includes a fiber bundle bonded as a whole by a plurality of fibers; the to-be-tested portion 24 includes a plurality of parallel fiber bundles; Step 2: placing the to-be-tested portion 24 in a high-temperature heating device of a ceramic fiber yarn tensile high-temperature test device; passing the clamping portion 23 through a tension clamp 3 fixed; step three: the induction heater 4 of the high-temperature heating device is used to program the temperature of the part to be detected 24. When the first preset temperature is reached, the tension detection device is turned on to perform a tension test on the part to be detected 24; when the second preset temperature is reached, the corresponding gas is introduced into the periphery of the part to be detected 24. When the third preset temperature is reached, the cooling system 7 located between the induction heater 4 and the tension clamp 3 is turned on; when the force-displacement curve shows the maximum force value during the stretching process of the fiber at the part to be detected, the maximum force on the force-displacement curve is used as its breaking tension, and the test temperature at the time of fracture is used as the detection temperature under the breaking tension.

[0048] By placing the fiber in a high-temperature heating device, clamping the fiber with glue injected at both ends with the clamp, increasing the friction between the fiber and the clamp, and preventing the fiber from slipping out of the clamp during the test, the atmosphere is filled into the high-temperature test device through the atmosphere maintenance system, so that the fiber is tested under different atmosphere environments, and the cooling system 7 is turned on to raise the tension high-temperature test device to the set temperature and tension speed, which can quickly increase the temperature to an environmental state basically consistent with the application environment. After reaching the measured temperature value, the set constant temperature can be quickly maintained, which can avoid the situation where the temperature changes drastically, so that the fiber is tensile tested at a constant temperature, avoiding the impact of temperature fluctuations on the test performance, thereby accurately and truly measuring the performance of the fiber; finally, the ceramic fiber tensile high-temperature test method can realize the characterization of the fiber for detection, and quickly reach a stable temperature during the detection process, avoiding the problem of secondary irreversible changes in the surface and internal structure of the fiber bundle due to heat during the detection temperature reaching process.

[0049] The method for preparing the fiber sample to be tested comprises the following steps: winding the pretreated fiber to be tested on the surface of the winding frame 25;

[0050] The pretreatment time is 2.5 minutes, and the curing temperature is 150°C. The purpose is to bundle the fibers and effectively prevent slippage when clamped. The two ends of the winding frame 25 are placed in a slurry box 26, which contains slurry. The slurry is made of polyurethane. The fibers on the surfaces of the winding frame 25 at both ends are impregnated with slurry, while the fibers in the middle of the winding frame 25 are not impregnated with slurry. The winding frame 25 is moved into a heating device for heating to achieve the bonding of the fibers at both ends of the winding frame 25 into a whole fiber bundle. The fibers in the middle of the winding frame 25 are arranged in parallel. The fiber sample to be tested is then sheared. By winding the fiber bundle in the winding frame 25 and placing the winding frame 25 in the slurry box 26, the length of the slurry-impregnated fibers at both ends of the fiber bundle is made consistent. After drying and shearing, multiple sections of test fibers with glue injected at both ends are easily obtained. When the induction heater 4 of the high-temperature heating device is used to program the temperature of the portion to be detected 24, the heat preservation device 15 provided on the induction heater 4 is turned on for program heat preservation; preferably, when the induction heater 4 of the high-temperature heating device is used to program the temperature of the portion to be detected 24, the heat preservation device 15 provided outside the induction heater 4 is turned on for program heat preservation, and the demagnetization device 19 located inside the induction heater 4 is turned on. By turning on the induction heater 4 and the heat preservation device 15 at the same time, the temperature can be quickly increased, and after reaching the measured temperature value, the temperature can be quickly maintained constant, which can avoid the situation where the temperature changes suddenly, so that the fiber can be tensile tested at a constant temperature. After turning on the induction heater 4, the demagnetization device 19 is turned on at the same time, which can eliminate the magnetic field around the portion to be detected 24 of the fiber, and avoid the generation of eddy currents due to the electromagnetic influence caused by the metal impurities inside the fiber during the fiber testing process, thereby affecting the test performance.

[0051] like Figure 1As shown: A ceramic fiber yarn tensile high-temperature testing device, including two tensile test sensing devices, a high-temperature heating device and a gas replacement device; the tensile test sensing device includes a stretching device 1, a tensile sensor 2 and a tensile clamp 3; a high-temperature heating device is provided between the two tensile clamps 3, and the high-temperature heating device includes an induction heater 4, an insulating layer 5 and a shell 6; a cooling system 7 is provided between the induction heater 4 and the tensile clamp 3; the induction heater 4 includes a first electric heating coil 8 and a first metal shell 9, the first metal shell 9 is provided with a heating accommodating chamber 10, and the part to be detected 24 is located in the heating accommodating chamber 10; the shell 6 is sleeved on the outside of the first electric heating coil 8; the first electric heating coil 8 is sleeved on the outer surface of the insulating layer 5; the insulating layer 5 is sleeved on the outside of the first metal shell 9; The insulating layer 5 is made of quartz glass, and electromagnetic induction heating is performed by the first electric heating coil 8 outside the insulating layer 5 and the first metal shell 9 inside the insulating layer 5 to prevent temperature loss; the gas is allowed to pass through the cooling system 7, the outer shell 6, and the insulating layer 5 into the insulating layer 5 through the gas replacement device; the gas replacement device includes an air inlet 11, an air outlet 12, an air inlet device 13 and an air outlet device 14, the heating accommodating chamber 10 is connected to the air inlet device 13 through the air inlet 11, and the heating accommodating chamber 10 is connected to the air outlet device 14 through the air outlet 12; the air inlet device 13 includes a gas storage tank and an air inlet pipeline, and the air outlet device 14 includes an air outlet pipeline, the atmosphere enters the heating accommodating chamber 10 from the air inlet 11 through the air inlet device 13, and the atmosphere is discharged from the air outlet 12 through the air outlet device 14. An infrared thermometer 29 is provided between the first metal shell 9 and the insulating layer 5. By adopting the infrared tester 29, the contact temperature measurement is prevented from failing to meet the test temperature requirements. The infrared temperature measurement has a fast response speed and is not limited by the upper limit of the temperature measurement. An induction heater 4 is provided in the high-temperature heater. The electromagnetic heating generated by the induction heater 4 can quickly increase the temperature in the heating chamber 10. The heat loss inside the heating chamber 10 is prevented by providing the insulating layer 5. When the appropriate temperature is reached, the tensile test is performed on the fiber to-be-tested portion 24 by the tensile clamp 3. A water cooling system is added to effectively improve the service life and reliability of equipment components. A gas replacement device is provided to meet the test requirements under different environmental atmospheres. Different atmospheres such as nitrogen, argon, and helium can be allowed to enter the heating chamber 10, and corrosion of the equipment and related materials in a high-temperature environment can be avoided. Finally, the characterization fiber is tested by the ceramic fiber tensile high-temperature test device, and a stable temperature is quickly reached during the test process, avoiding the problem of secondary irreversible changes in the surface and internal structure of the fiber bundle due to heat during the process of reaching the test temperature.

[0052] like Figure 4The figure shows a device for preparing fiber samples to be tested, comprising a winding frame 25 and an end bundling device. The bundling device includes two slurry boxes 26 and a sliding device 28 slidably connected to the slurry boxes 26. The slurry boxes 26 are provided with horizontal slide rails, and the sliding device 28 has a slide groove that matches the horizontal slide rails. The two ends of the winding frame 25 are respectively located within the two slurry boxes 26, and the middle of the winding frame 25 is located outside the slurry boxes 26. The slurry boxes 26 are provided with injection holes. The slurry boxes 26 slide on the sliding device 28 to adjust the horizontal distance between the two slurry boxes 26. The winding frame 25 is detachably located between the two slurry boxes 26. The slurry box 26 includes an upper box body 26, a lower box body 27, and a blocking device connecting the upper box body 26 and the lower box body 27; the upper box body 26 is provided with a vertical slide rail, and the sliding device 28 is provided with a slide groove matching the vertical slide rail; one side surface of the upper box body 26 and one side surface of the lower box body 27 are arranged opposite to each other to form a gap matching the winding frame 25; when the end of the winding frame 25 is located between the relatively arranged upper box body 26 and the lower box body 27, the blocking device and the upper box body 26 and the lower box body 27 form a closed liquid storage cavity, and the end of the winding frame 25 is located in the liquid storage cavity. By setting the horizontal slide rail of the slurry box 26 to slide in cooperation with the slide groove of the sliding device 28, the horizontal distance between the two slurry boxes 26 can be adjusted. By providing the slurry box 26 with an upper box body 26 and a lower box body 27, the winding frame 25 with the fiber placed is placed on the upper box body 26, and the vertical slide rail of the upper box body 26 slides downward in cooperation with the slide groove of the sliding device 28, so that the winding frame 25 with the fiber placed is placed on the lower box body 27 filled with slurry. The upper box body 26 and the lower box body 27 are surrounded by a closed liquid storage chamber through a blocking device, so that both ends of the winding frame 25 are immersed in the slurry, thereby making both ends of the fiber immersed in the slurry.

[0053] Example 2:

[0054] like Figure 2 As shown: the same contents as those in the first embodiment are not repeated here; the differences between the first embodiment and the present embodiment are as follows:

[0055] The high-temperature heating device further includes a heat preservation device 15, which includes a second electric heating coil 16 and a second metal shell 17; the second metal shell 17 is provided with a heat preservation chamber 18, and the induction heater 4 is located in the heat preservation chamber 18;

[0056] The housing 6 is sleeved on the outside of the second electric heating coil 16 ; the second electric heating coil 16 is sleeved on the outer surface of the insulating layer 5 ; and the insulating layer 5 is sleeved on the second metal shell 17 .

[0057] By arranging the heat preservation device 15 outside the induction heater 4, the second electric heating coil 16 and the second metal shell 17 are heated by electromagnetic induction, which can accelerate the heating speed and avoid rapid temperature loss.

[0058] Example 3:

[0059] like Figure 3 As shown: the same contents as those in the second embodiment are not repeated here; the differences between the second embodiment and the present embodiment are as follows:

[0060] The high-temperature heating device further includes a demagnetization device 19, which includes a third electric heating coil 20 and a third metal shell 21; the third metal shell 21 is provided with a demagnetization accommodating chamber 22, the demagnetization device 19 is located in the heating accommodating chamber 10, and the portion to be detected 24 is located in the demagnetization accommodating chamber 22;

[0061] The outer shell 6 is sleeved on the outside of the second electric heating coil 16; the second electric heating coil 16 is sleeved on the outer surface of the insulation; the insulating layer 5 is sleeved on the outside of the second metal shell 17;

[0062] The first metal conductor, the second metal conductor and the third metal conductor are made of high-purity graphite, metal iridium gold, molybdenum gold, tungsten gold and alloys thereof.

[0063] By arranging a demagnetization device 19 in the heating chamber 10, the third electric heating coil 20 and the third metal conductor generate reverse magnetic fields, thereby eliminating the magnetic field around the fiber's test portion 24, thereby avoiding the generation of eddy currents due to electromagnetic influence caused by metal impurities inside the fiber during the fiber testing process, thereby affecting the test performance.

[0064] The minimum distance between the third electric heating coil 20 and the first electric heating coil 8 is greater than or equal to 65 cm.

[0065] By setting the minimum distance between the third electric heating coil 20 and the first electric heating coil 8 to be greater than or equal to 65 cm, there is no magnetic field around the fiber, and at the same time, the magnetic field around the first electric heating coil 8 and the second electric heating coil 16 is not affected, thereby avoiding electromagnetic induction from affecting the tested fiber performance and avoiding the reverse magnetic field from affecting the heating of the first electric heating coil 8 and the second electric heating coil 16.

[0066] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions described in the above embodiments, or replace some of the technical features therein with equivalents; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A high-temperature tensile testing method for ceramic fiber yarns, characterized by: The method comprises the following steps: Step 1: injecting glue at both ends of a plurality of parallel fiber bundles to be tested to obtain a fiber sample to be tested; The fiber sample to be tested comprises a clamping portion (23) located at both ends and a portion to be tested (24) located between the two ends; The clamping portion (23) includes a plurality of fiber bundles bonded together as a whole; the portion to be detected (24) includes a plurality of fiber bundles arranged in parallel; Step 2: placing the portion to be tested (24) in a high-temperature heating device of a ceramic fiber yarn tensile high-temperature testing device; Fixing the clamping portion (23) by means of a tension clamp (3); Step 3: The induction heater (4) of the high-temperature heating device is used to program the temperature of the part to be detected (24). When the first preset temperature is reached, the tension detection device is turned on to perform a tension test on the part to be detected (24). When the second preset temperature is reached, a corresponding gas is introduced around the part to be detected (24). When the third preset temperature is reached, the cooling system (7) located between the induction heater (4) and the tension clamp (3) is turned on. When the force-displacement curve shows the maximum force value during the stretching process of the fiber at the tested part, the maximum force on the force-displacement curve is taken as its breaking force, and the test temperature at the time of fracture is taken as the test temperature under the breaking force.

2. A ceramic fiber tensile high temperature testing method according to claim 1, characterized in that: The preparation method of the fiber sample to be tested comprises the following steps: winding the pretreated fiber to be tested on the surface of a winding frame (25); placing the two ends of the winding frame (25) in a slurry box, wherein the slurry is contained in the slurry box; the fibers on the surfaces of the two ends of the winding frame (25) are immersed in the slurry, while the fibers located in the middle of the winding frame (25) are not immersed in the slurry; moving the winding frame (25) into a heating device for heating, so that the fibers at the two ends of the winding frame (25) are bonded into an integral fiber bundle; the fibers in the middle of the winding frame (25) are parallel fibers; and then shearing is performed to obtain the fiber sample to be tested.

3. A ceramic fiber tensile high temperature testing method according to claim 1, characterized in that: When the induction heater (4) of the high-temperature heating device performs programmed temperature increase on the portion to be detected (24), the heat preservation device (15) provided on the induction heater (4) is turned on to perform programmed temperature preservation; Preferably, when the induction heater (4) of the high-temperature heating device is used to perform programmed temperature increase on the portion to be detected (24), the heat preservation device (15) provided outside the induction heater (4) is turned on to perform programmed temperature preservation, and the demagnetization device (19) located inside the induction heater (4) is turned on.

4. A ceramic fiber tension high temperature testing device, characterized in that: The invention comprises two tension test sensing devices, a high-temperature heating device and a gas replacement device; the tension test sensing device comprises a stretching device (1), a tension sensor (2) and a tension clamp (3); a high-temperature heating device is provided between the two tension clamps (3), and the high-temperature heating device comprises an induction heater (4), an insulating layer (5) and a shell (6); a cooling system (7) is provided between the induction heater (4) and the tension clamp (3); The induction heater (4) comprises a first electric heating coil (8) and a first metal shell (9); the first metal shell (9) is provided with a heating accommodating chamber (10); the portion to be detected (24) is located in the heating accommodating chamber (10); The gas replacement device enables the gas to pass through the cooling system (7), the outer shell (6), and the insulating layer (5) and enter the heating accommodating chamber (10).

5. The ceramic fiber tension high temperature testing device according to claim 3 is characterized in that: The gas replacement device comprises an air inlet (11), an air outlet (12), an air inlet device (13) and an air outlet device (14); the heating accommodating chamber (10) is connected to the air inlet device (13) through the air inlet (11); and the heating accommodating chamber (10) is connected to the air outlet device (14) through the air outlet (12).

6. A ceramic fiber tension high temperature testing device according to claim 3, characterized in that: The outer shell (6) is sleeved on the outside of the first electric heating coil (8); the first electric heating coil (8) is sleeved on the outer surface of the insulating layer (5); and the insulating layer (5) is sleeved on the outside of the first metal shell (9).

7. The ceramic fiber tension high temperature testing device according to claim 3 is characterized in that: The high-temperature heating device further comprises a heat preservation device (15), wherein the heat preservation device (15) comprises a second electric heating coil (16) and a second metal shell (17); the second metal shell (17) is provided with a heat preservation accommodating cavity (18), and the induction heater (4) is located in the heat preservation accommodating cavity (18); The outer shell (6) is sleeved on the outside of the second electric heating coil (16); the second electric heating coil (16) is sleeved on the outer surface of the insulating layer (5); and the insulating layer (5) is sleeved on the second metal shell (17).

8. The ceramic fiber tension high temperature testing device according to claim 5, characterized in that: The high-temperature heating device further comprises a demagnetization device (19), the demagnetization device (19) comprising a third electric heating coil (20) and a third metal shell (21); the third metal shell (21) is provided with a demagnetization accommodating chamber (22), the demagnetization device (19) is located in the heating accommodating chamber (10), and the portion to be detected (24) is located in the demagnetization accommodating chamber (22); The outer shell (6) is sleeved outside the second electric heating coil (16); the second electric heating coil (16) is sleeved on the outer surface of the insulation; and the insulating layer (5) is sleeved outside the second metal shell (17).

9. The ceramic fiber tension high temperature testing device according to claim 7, characterized in that: The minimum distance between the third electric heating coil (20) and the first electric heating coil (8) is greater than or equal to 60-70 cm.

10. A device for preparing fiber samples to be tested, characterized in that: The invention comprises a winding frame (25) and an end bundling device, wherein the bundling device comprises two slurry boxes and a sliding device (28) slidably connected to the slurry boxes, the slurry boxes are provided with horizontal slide rails, and the sliding device (28) is provided with a slide groove matching the horizontal slide rails; the two ends of the winding frame (25) are respectively located in the two slurry boxes, and the middle part of the winding frame (25) is located outside the slurry boxes; and the slurry boxes are provided with a liquid injection hole. The slurry box slides on the sliding device (28) to achieve adjustable horizontal distance between the two slurry boxes; the winding frame (25) is detachably located between the two slurry boxes. The slurry box comprises an upper box body (26), a lower box body (27), and a blocking device connecting the upper box body (26) and the lower box body (27); the upper box body (26) is provided with a vertical slide rail, and the sliding device (28) is provided with a slide groove matching the vertical slide rail; a side surface of the upper box body (26) and a side surface of the lower box body (27) are arranged opposite to each other to form a gap matching the winding frame (25); When the end of the winding frame (25) is located between the upper part (26) and the lower part (27) of the box body that are arranged opposite to each other, the blocking device, the upper part (26) and the lower part (27) of the box body form a closed liquid storage cavity, and the end of the winding frame (25) is located in the liquid storage cavity.

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