The Optimal Brazing Method For Titanium And Titanium Alloys

The alloy made from titanium and metal elements such as iron, aluminum, vanadium, molybdenum, etc. has excellent physical and mechanical properties such as high strength, high heat resistance, and good corrosion resistance. It is widely used in high-tech fields such as chemical engineering, marine engineering, transportation, medical, construction, aerospace, and military industry, and is an extremely important lightweight structural material. Among them, aerospace is an important downstream application field. Titanium and titanium alloys are active metals widely used in aerospace, petrochemical, and atomic energy industries. The main problems in titanium and titanium alloy brazing are manifested in the following aspects:
① The surface oxide film is stable, and titanium and its alloys have a high affinity for oxygen. The surface is prone to forming a very stable oxide film, which hinders the wetting and spreading of the solder. Therefore, it must be removed during brazing Titanium and its alloys have a strong tendency to absorb hydrogen, oxygen, and nitrogen during heating, and the higher the temperature, the more severe the absorption, resulting in a sharp decrease in the plasticity and toughness of titanium metal. Therefore, brazing should be carried out in a vacuum or inert atmosphere Easy to form intermetallic compounds, titanium and its alloys can undergo chemical reactions with most needle materials, generating brittle compounds and causing brittle joints. Therefore, brazing materials used for brazing other materials are generally not suitable for brazing active metals The organization and performance are prone to change. Titanium and its alloys undergo phase transformation and grain coarsening during heating, and the higher the temperature, the more severe the coarsening. Therefore, the temperature for high-temperature brazing should not be too high.
The alloy made from titanium and metal elements such as iron, aluminum, vanadium, molybdenum, etc. has excellent physical and mechanical properties such as high strength, high heat resistance, and good corrosion resistance. It is widely used in high-tech fields such as chemical engineering, marine engineering, transportation, medical, construction, aerospace, and military industry, and is an extremely important lightweight structural material. Among them, aerospace is an important downstream application field.
Titanium and titanium alloys are active metals widely used in aerospace, petrochemical, and atomic energy industries. The main problems in titanium and titanium alloy brazing are manifested in the following aspects:
① The surface oxide film is stable, and titanium and its alloys have a high affinity for oxygen. It is easy to form a very stable oxide film on the surface, which hinders the wetting and spreading of the brazing material. Therefore, it must be removed during brazing.
② Titanium and its alloys have a strong tendency to absorb hydrogen, oxygen, and nitrogen during heating, and the higher the temperature, the more severe the absorption, resulting in a sharp decrease in the plasticity and toughness of titanium metal. Therefore, brazing should be carried out in a vacuum or inert atmosphere.
③ Easy to form intermetallic compounds, titanium and its alloys can undergo chemical reactions with most needle materials, generating brittle compounds and causing brittle joints. Therefore, brazing materials used for brazing other materials are generally not suitable for brazing active metals.
④ The organization and performance are prone to change. Titanium and its alloys undergo phase transformation and grain coarsening during heating, and the higher the temperature, the more severe the coarsening. Therefore, the temperature for high-temperature brazing should not be too high.