Sample preparation method and device for testing high temperature strength retention rate of fiber bundles

Abstract

The invention relates to a sample preparation method and device for testing the high-temperature strength retention rate of fiber bundles, belonging to the technical field of material testing. The sample preparation device includes a frame, two groups of fiber fastening components and two fastening pressing sheets, each group includes at least three fiber fastening components arranged side by side, wherein one group of fiber fastening components is arranged on the first part of the frame. On the frame, it is used for one-to-one correspondence with the fiber bundles to be tested, so as to fix the first end of the fiber bundles to be tested, and another group of fiber fastening components is arranged on the second frame opposite to the first frame, for use with The fiber bundles to be tested are in one-to-one correspondence to fix the second end of the fiber bundles to be tested, and the two fastening pressing pieces are respectively fixed on the first frame and the second frame, and are located between the two groups of fiber fastening components. To compress the fiber bundle to be tested. The invention keeps the fiber bundle to be tested in a tight state all the time during the heat treatment process, and avoids the dispersion of test results caused by bending deformation of the fiber at high temperature.

Description

technical field [0001] The invention belongs to the technical field of material testing, and in particular relates to a sample preparation method and a sample preparation device for testing the high-temperature strength retention rate of fiber bundles. Background technique [0002] Silicon carbide fiber is a reinforcement of high-performance ceramic matrix composites that emerged in the 1980s. Compared with other high-performance fibers such as carbon fiber and oxide fiber, silicon carbide fiber has excellent properties such as low density, high temperature resistance, radiation resistance, long-term oxidation resistance, erosion resistance, and high strength. It is used in the thermal protection system of aerospace vehicles. , nuclear fission reactor nuclear fuel cladding, nuclear fusion reactor first wall materials and other fields have a wide range of application values. [0003] As a high temperature resistant material, the strength retention rate of silicon carbide fib...

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Problems solved by technology

[0004] However, due to the hard and brittle characteristics of silicon carbide fibers, carbon fiber bundles placed in a free state are prone to irreversible bending after heat treatment. If it is used to evaluate the high temperature strength retention rate of fiber bundles or monofilaments, the test results will be discrete Large, and easy to cause fiber damage in the subsequent sample preparation process, resulting in distortion of test results

On the other hand, from the perspective of silicon carbide fiber application, the mechanical properties of fiber bundles are of more practical reference significance, but there is no standard and method for testing the high-temperature strength retention rate of silicon carbide fiber bundles in China

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