Alloy for braze welding of high-intensity graphite and titanium alloy and preparation method thereof

Abstract

The invention discloses an alloy for braze welding of high-intensity graphite and titanium alloy and a preparation method thereof. The alloy comprises the following elements in percentage by weight: 50%-65% of Ti, 30%-45% of Cu and 5%-10% of Si. The preparation method of the alloy comprises the following steps of: preparing materials according to the following elements in percentage by weight: 50%-65% of Ti, 30%-45% of Cu and 5%-10% of Si; performing vacuum electric arc smelting at a vacuum degree of 5*10<-3>-8*10<-3> Pa and at an electric arc current of 1100-1300 A; and electromagnetically stirring for 1-3 minutes, and then cooling. According to the invention, the alloy components are optimized, various chemical reaction products with good mechanical properties at high temperature are formed on the reaction interface, the braze welding temperature is effectively reduced, and the application temperature of a welded joint is increased.

Description

technical field [0001] The invention relates to an alloy for high-strength graphite and titanium alloy brazing and a preparation method thereof. Background technique [0002] Graphite is a high strength material with a low atomic weight. It has the properties of low relative density, high thermal conductivity, high heat capacity and excellent impact resistance, and also has a series of excellent characteristics such as high sublimation point (3850°C). This makes it the only high-temperature material that can be used up to 2800°C and is widely used in energy, aerospace, electronics and other fields. Titanium and titanium alloys are a new type of light alloy material, which has a series of excellent properties such as high specific strength, high temperature resistance and corrosion resistance. The welding parts of graphite and titanium alloy have the advantages of both, and have broad development prospects in national defense and civilian technology. However, the welding p...

AI Technical Summary

Problems solved by technology

Graphite metallization process is complex, technically difficult, and costly, so most researchers currently prefer the second welding method. The active element Ti in the solder can chemically react with the C element in graphite to form TiC, strengthening connection between

The Ag-based alloy currently being studied has a relatively low service temperature (less than 400°C); the Ti-Ni solder alloy has a welding temperature as high as 1420°C, and Ti reacts violently with graphite at high temperatures, which can form very thick The carbide layer is easy to cause cracks due to thermal stress; the TiZrNiCu quaternary alloy solder has complex components, and it is easy to form a variety of eutectic compounds, which reduces the joint strength, and the diffusion ability of Zr element is low, which plays a role in joint connection performance. not so useful