High-temperature brazing filler metal for soldering C/C and C/SiC composite materials and preparation methods thereof

Abstract

A high-temperature brazing filler metal for soldering C/C and C/SiC composite materials and preparation methods thereof relate to high-temperature soldering materials and preparation methods of the high-temperature soldering materials and mainly solve the problems of low high-temperature strength retention rate and poor performance of soldering joints in existing high-temperature solders for soldering the C/C and C/SiC composite materials. The high-temperature brazing filler metal for soldering the C/C and C/SiC composite materials is made from Ni and Zr or ZrH2. A method I comprises 1) weighing Ni and Zr or ZrH2, 2) performing smelting to obtain an alloy ingot and 3) performing foil fabrication. A method II comprises 1) weighing Ni and Zr or ZrH2, 2) performing ball milling to obtain a mixed powder and 3) pressing the mixed power to obtain foils and washing and drying the foils. The high-temperature brazing filler metal for soldering the C/C and C/SiC composite materials can provide a good wettability for the C/C and C/SiC composite materials and can mainly be formed into two structures during a soldering process, thereby guaranteeing the mechanical performance of the soldering joints. The components of the high-temperature brazing filler metal for soldering C/C and C/Sic composite materials do not contain precious metals, so that the cost is low; and the melting point of the component Zr is 1852 DEG C, so that the soldering joints can be guaranteed to have a high strength retention rate at 600 DEG C.

Description

technical field [0001] The invention relates to a high-temperature brazing material and a preparation method thereof. Background technique [0002] C / C and C / SiC composite materials have low density, high strength, low ablation rate, high thermal shock resistance, low thermal expansion coefficient, and the strength and modulus increase with temperature within 2000 ° C, so they become Important high-temperature structural materials in the field of aerospace. However, C / C and C / SiC composite materials are difficult to machine and difficult to process into complex shapes, which limits their wide application in practical engineering. Therefore, realizing their connection with themselves or with other materials has important application value. [0003] C / C and C / SiC composite materials have high melting points and cannot form a liquid phase. Common fusion welding methods such as TIG, MIG, laser welding, and electron beam welding are difficult to adapt to the connection of C / C a...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the existing high-temperature solder for welding C / C or C / SiC has a low joint high-temperature strength retention rate and poor joint performance, and provides a method for brazing C / C and C / SiC composite materials High-temperature solder and its preparation method

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