Thermal fatigue testing system for ceramic-based composite material structural part

Abstract

The invention discloses a thermal fatigue testing system for a ceramic-based composite material structural part. The system comprises a thermal radiation part and a high-frequency sensitive heating furnace, wherein the high-frequency sensitive heating furnace comprises a sensitive heating copper tube which is arranged around the thermal radiation part, an industrial cooling water machine, an air compressor, a PLC (Programmed Logic Controller), a temperature measuring device and a full-field strain gauge. By adopting the technical scheme of the invention, the ceramic-based composite material structural part is indirectly heated through high-frequency sensitivity, and the heating speed, the heat-preservation temperature and the cooling time of the testing process are automatically controlled.

Description

technical field [0001] The invention relates to a thermal fatigue test system for ceramic matrix composite material structural parts, belonging to the technical field of ceramic matrix composite material testing. Background technique [0002] Ceramic materials have many advantages such as high temperature resistance, low density, corrosion resistance and high hardness. But its brittleness is an important shortcoming that restricts the popularization and application of structural ceramic materials. Researchers have conducted extensive research on ceramic toughening methods. The current common toughening methods include short fiber reinforcement (whisker reinforcement), layered toughening and continuous fiber toughening. Commonly used toughening fibers include glass fibers, high modulus carbon fibers, silicon carbide fibers, alumina fibers, etc. The toughened ceramic matrix composite (CMC) has higher reliability and is less prone to brittle fracture. [0003] In aero-engin...

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Problems solved by technology

However, the high-temperature box-type resistance furnace can only provide a uniform temperature field, and the furnace of the high-temperature electric furnace is closed, so it is impossible to cool the test piece locally by cooling air, and it is not convenient to measure the temperature and observe the test process in real time

[0008] (2) Flame heating: Flame heating can provide a higher temperature for the test piece, but it cannot precisely control the temperature field, and the test piece is on a closed test bench, which increases the difficulty of strain measurement of the test piece, and this heating method expensive

This test scheme uses the high-temperature gas generated by combustion to heat the test piece. This scheme is also unable to accurately determine the surface temperature field of the component test piece, and the gas heating has the disadvantages of high cost and large pollution.

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