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Thermo-mechanical-environmental coupling effect testing device and application from room temperature to ultrahigh temperature

A test device, ultra-high temperature technology, applied in the direction of testing material strength by applying stable bending force, testing material strength by applying stable tension/compression, and weighing by removing certain components, which can solve the problem of poor test repeatability , Heating body and sample fixtures are difficult to withstand ultra-high temperature, uneven temperature field of materials, etc.

Active Publication Date: 2014-12-17
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there are no relevant equipment and effective testing methods for the evaluation of ultra-high temperature mechanical properties of materials in aerobic environments above 1600 °C at home and abroad. The main reason is that due to the limitations of the melting point and mechanical properties of heating elements, the It is difficult for the heating element of the equipment and the fixture of the sample to withstand the ultra-high temperature above 1600°C
Although, Bao Yiwang of the China Academy of Building Materials Science and others used oxygen-acetylene partial heat loading to test the mechanical properties of materials in an ultra-high temperature oxidation environment above 1500 ° C. The fire-spraying technology locally heats the sample quickly, so that the local temperature reaches above 1500°C, but this local heating method makes the temperature field of the material uneven, and the repeatability of the test is poor; / The impact of ultra-high temperature oxidation performance has no relevant reports and testing equipment at home and abroad

Method used

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  • Thermo-mechanical-environmental coupling effect testing device and application from room temperature to ultrahigh temperature
  • Thermo-mechanical-environmental coupling effect testing device and application from room temperature to ultrahigh temperature
  • Thermo-mechanical-environmental coupling effect testing device and application from room temperature to ultrahigh temperature

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0081] Example 1: Testing the ultra-high temperature tensile strength of oxidation-resistant carbon / carbon composites

[0082] In the tensile strength test, the length of the gauge section of the sample is 30mm, the width of the sample is 10mm, and the thickness is 5mm. The test device is as follows: figure 1 As shown, fix the two ends of the sample in the upper and lower fixtures respectively to ensure that the sample is perpendicular to the loading direction, adjust the power of the induction power supply to heat the sample to the target temperature of 2200 ° C, and adjust the pressure control system at the same time to keep the air in the vacuum chamber up to 20KPa Ambient atmosphere, the sample was kept warm for 1800s.

[0083] The loading control system loads the sample at a speed of 1mm / min through the loading device until the sample breaks. When the sample breaks, the load recorded by the loading control system will decay rapidly, so it can be judged that the maximum lo...

Embodiment 2

[0084] Example 2: Testing the high-temperature flexural strength of carbon / silicon carbide composites and a ternary layered machinable ceramic

[0085] The bending strength sample size is 3.02mm×3.98mm×40.1mm. Fix the sample on the rollers of the ultra-high temperature ceramic fixture, and the span between the two lower rollers is 20mm; adjust the power of the induction power supply to heat the carbon / silicon carbide composite to 1600°C and keep it in air for 600s.

[0086] The loading control system loads the sample at a speed of 0.5 mm / min through the loading device until the sample breaks, and records the strength-displacement curve, such as Figure 4 As shown, the strength of the sample when it breaks is 260MPa.

[0087] For the test of the bending strength of ternary layered machinable ceramics, the sample size is as above, and the test temperature distribution is selected as 1000°C, 1200°C and 1400°C, Figure 5 are the intensity-displacement curves at three temperature...

Embodiment 3

[0088] Example 3: Testing the ultra-high temperature compressive strength of a three-way braided composite

[0089] The compressed sample is a three-way braided composite material with a size of 4.02mm×5.0mm×39.8mm. The sample is fixed on the ultra-high temperature ceramic lower pressure rod along the length direction, and the upper pressure rod connected to the pressure sensor is in contact with the upper end of the sample. Apply a preload of about 5N and adjust the power of the induction power supply to heat the compressed sample to 1600°C.

[0090] The loading control system loads the sample at a speed of 0.5mm / min through the loading device until the sample is broken, and records the strength-displacement curve, such as Figure 6 As shown, the strength of the sample when it breaks is 235MPa.

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Abstract

The invention relates to the field of test of mechanical properties of materials and in particular relates to a thermo-mechanical-environmental coupling effect testing device and application from room temperature to ultrahigh temperature. The device comprises an electronic universal testing machine, a loading control system, a power supply control system, an induction heater, a strain measurement system, a sample clamp, a temperature measuring system, a pressure control system, a display and analysis system and a vacuum system, wherein a vacuum cavity in the electronic universal testing machine is in a fully water-cooled design, and various functional windows, such as a sensor connector of the clamp and the electronic universal testing machine, an infrared or thermocouple temperature measuring opening of the temperature measuring system, a pressure control opening of the pressure control system, an induction power supply introduction opening of the power supply control system, an extensometer introduction opening of the strain measurement system and a connector of the vacuum system and the vacuum cavity, are reserved in different parts of the vacuum cavity. The device disclosed by the invention can quantitatively research the thermo-mechanical-environmental coupling effect and has the advantages of diversified tested mechanical property parameters, high sample heating and cooling speed and the like.

Description

technical field [0001] The invention relates to the field of material mechanical performance testing, in particular to a thermal-mechanical-environmental coupling test device and application of materials at room temperature to ultra-high temperature, especially for thermal-mechanical-oxygen coupling testing at high temperature / ultra-high temperature , with the help of an electronic universal testing machine combined with electromagnetic induction heating to realize the method and device for testing the mechanical properties of materials such as tension, compression, and bending at ultra-high temperatures. At the same time, the device can also be used to study the influence of mechanical loads on the oxidation properties of materials. Background technique [0002] With the rapid development of near-space (30-70 km) aircraft with hypersonic speed (speed greater than Mach 5) and high maneuverability as the main technical features, high-temperature materials and structural parts ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/20G01N5/04G01N3/18
Inventor 徐敬军李美栓王晓辉钱余海
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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