Active core silver solder for soldering ceramics and preparation method thereof

Abstract

The invention relates to an active core silver solder for soldering ceramics and a preparation method thereof, and the active core silver solder comprises two parts, namely a core part and an outer layer, wherein the core part is composed of an active alloy containing active elements and the outer layer is composed of a silver alloy. The active core silver solder comprises the following main components by weight percent: 2-6% of the active alloy comprising three elements, namely Ti, Zr and Hf, wherein the active alloy contains 0.1-5wt% of the Zr, 0-3wt% of the Hr and the balance of the Ti; and 94-98% of the silver alloy comprising the elements of Ag, Cu and Ge, wherein the silver alloy contains 66-72wt% of the Ag, 26-27.9wt% of the Cu and 0.1-8wt% of the Ge. The threadlike active core silver solder can be directly obtained by adopting a method of wrapping an active core at the interior by extrusion through semi-molten metal. Compared with the characteristic of low melting point of thesolder of domestic like products, the preparation process is high in production efficiency and a new way is opened for manufacturing the solder which is difficult to machine and form due to brittle intermetallic compounding.

Description

technical field [0001] The invention relates to an active-core silver solder for brazing ceramics and a preparation method thereof, which is mainly used for brazing connection of ceramics and composite materials thereof, and belongs to the field of brazing materials and their manufacture. Background technique [0002] Ceramic materials play an important role in modern industry and high-tech fields. It has a series of excellent properties such as high temperature resistance, oxidation resistance, corrosion resistance and wear resistance, and has excellent electrical insulation performance and chemical stability. It is widely used in cutting-edge industries such as ceramic engines, magnetic fluid power generation and nuclear reactors, and vacuum electronic devices. and other electronic fields. [0003] In practical applications, because ceramic materials are brittle and difficult to form, it is usually necessary to connect ceramics and metals. Brazing is one of the methods fo...

AI Technical Summary

Problems solved by technology

This is mainly because the Ti element is easy to react with most metals to form brittle intermetallic compounds, which makes the solder brittle. Studies have shown that in the Ag-Cu-Ti active solder, when the Ti content exceeds 6wt%, it is difficult to squeeze and pull. drawing, rolling

At present, most of the active brazing materials for ceramic connection in China use simple metal powder, which is prepared according to a certain mass fraction, mixed by ball milling or other methods, and then brazed ceramics. This method is difficult to mix the simple powder evenly, which affects ceramic brazing. The performance of the joint

Other forms of solder such as filamentary and flake active solder are mostly imported from Germany or Japan. Due to poor procurement channels and high prices of imported products, the application of active solder is affected.

Images