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Method for preparing tension specimen made from composite material of Ti alloy base enhanced by continuous SiC fibre

A fiber-reinforced and composite material technology, which is applied in the field of preparing continuous SiC fiber-reinforced Ti alloy-based composite tensile samples, can solve the problems of affecting the accuracy of tensile sample performance testing, failing to reflect the real performance of materials, and fractures at the front of the fixture. To achieve the effect of avoiding interface reaction and fiber damage, ensuring the uniformity of arrangement, and reducing the hot pressing temperature

Inactive Publication Date: 2006-06-28
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
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  • Description
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  • Application Information

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Problems solved by technology

For plate-shaped tensile samples, there is a problem of uniformity in the arrangement, most of which are randomly arranged, and the shape and size of the tensile samples have a certain impact on the accuracy of the performance test
During the stretching process, the damage to the sample by the clamping part will cause the sample to break from the front end of the clamp, which cannot reflect the real performance of the material

Method used

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  • Method for preparing tension specimen made from composite material of Ti alloy base enhanced by continuous SiC fibre

Examples

Experimental program
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Effect test

Embodiment 1

[0019] In this embodiment, J801-7A / ZF winding unit and ZRY45B vacuum hot pressing furnace are used. The experimental process is as follows:

[0020] 1) Using a winding unit, the continuous SiC fiber-reinforced Ti alloy matrix composite material precursor wire is used as a raw material, and is wound onto a circular stainless steel cylinder in a single layer in a close-packed manner, and then xylene and polypropylene are used at a ratio of 1: 1 The adhesive prepared in the weight ratio flattens and fixes the surface of the wire to make a prefabricated board; then cut the prefabricated board according to the size of the mold for hot pressing and compounding;

[0021] 2) Before hot pressing, first stack the prefabricated panels together, place 5 pieces of metal foil with a thickness of 40 μm on the upper and lower sides of the stacked layer, put them into the mold, and then put them into a hot pressing furnace. The thermal decomposition and degassing of the binder is carried out i...

Embodiment 2

[0026] The difference from Example 1 is:

[0027] The continuous SiC fiber-reinforced Ti alloy-based composite material is used as the pioneer wire, which is wound on a circular stainless steel cylinder through three layers in a close-packed manner. The binder can also be formulated with polymethyl methacrylate and acetone. The weight ratio of the two is 1:20;

[0028] Place a piece of metal foil with a thickness of 400 μm on the upper and lower sides of the stacked layer of the prefabricated board; the specific operation for thermal decomposition and degassing of the adhesive is: degassing at 250 ° C for 4 hours, and then degassing at 600 ° C for 3 hours Hours; in order to make full use of the superplastic flow of the matrix, after the degassing is completed, heat up to the hot pressing temperature and pressurize, specifically: first heat up to the hot pressing temperature within 20 minutes to 650 ° C, keep warm for 20 minutes, and pressurize at 14Mpa , hold pressure, and ho...

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Abstract

A process for preparing the stretch specimen of continuous SiC fibre reinforced Ti alloy-base composition includes such steps as winding the precursor wire of said composition around a stainless steel drum, coating adhesive to form smooth surface, solidifying to become prefabricated plate, cutting, hot die pressing at 250-600 deg.C for thermodecomposing adhesive to remove it, heating, hot pressing to obtain plate specimen, cutting, and post-treating.

Description

technical field [0001] The invention relates to composite material preparation technology, in particular to a method for preparing continuous SiC fiber-reinforced Ti alloy-based composite tensile samples. Background technique [0002] The development of aviation, aerospace and space technology requires high-temperature materials to have lower density, higher strength and higher operating temperature. However, traditional high-temperature materials such as titanium alloys and nickel-based superalloys are close to their maximum operating temperature, so new high-temperature materials must be developed to meet the continuously increasing operating temperature requirements of aero-engines. Continuous SiC fiber reinforced titanium matrix composites is a development direction of new high-performance space structure materials. SiC fiber has the advantages of high specific strength, high specific modulus, good thermal stability, corrosion resistance and wear resistance, so it can b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C47/00C22C49/11G01N1/28G01N3/00
Inventor 王玉敏符跃春石南林张德志杨锐
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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