Research status of brazing interface and erosion control of titanium alloy

Titanium alloy has excellent characteristics such as low density and high strength, known as ‘metal of the future’, it is a new type of lightweight structural material with great application prospects, and it is widely used in the key parts of high-end equipment in the aerospace, shipbuilding, and national defense and military industries. In recent years, development trend of aerospace equipment lightweight is obvious, large size, complex structure, thin-walled structure of high-strength titanium alloy components manufacturing demand has received great attention. Brazing is the most effective manufacturing method for complex, multi-layer, thin-walled structure titanium alloy components. Research reports on brazing of titanium alloys at home and abroad are reviewed, focusing on erosion problem of brazed joints of titanium alloy. By summarizing the commonly used crystalline titanium-based brazing materials, amorphous titanium-based brazing materials, in-situ synthetic titanium-based brazing materials and brazing process parameters, effects of brazing material composition, brazing temperature and holding time on erosion are analyzed. The summary proposes relevant solutions to reduce erosion. For example, reducing melting point of brazing material and lowering the brazing temperature is by adjusting elemental content of brazing material. Amorphous titanium-based brazing material is adopted to reduce compounds content of brazed joints. In-situ synthesized titanium-based brazing material is adopted to reduce diffusion of brazing material to base material. Further attention should be paid to the subsequent research on brazing of thin-walled titanium alloys.