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Titanium alloy vacuum brazing process

The biggest advantages of titanium alloys are their high specific strength and superior overall performance. Among all titanium and alloys, TC4 is the most commonly used. Based on its high specific strength, high specific stiffness, good oxidation resistance, corrosion resistance, and high temperature tensile strength It has high high and low cycle fatigue strength, good plasticity, and good processing, forming and weldability. It has been widely used in manufacturing important structural parts in aviation, aerospace vehicles and other fields. In the aircraft manufacturing industry, it is mainly used to manufacture light-weight, highly reliable structures, such as engine brackets, engine casings, and compressor disks. In aerospace engineering, strength is more important, and TC4 titanium alloy is mainly used to make pressure Containers, tanks, engines, satellite skins, space shuttle fuselages, etc. The high-temperature components of rocket engines are generally made of TC4 alloy. As an important part of the engine, there are high requirements for the normal temperature and high-temperature strength of high-temperature components, and the welding structure is relatively complex. Therefore, the reliable connection of high-temperature components of TC4 titanium alloy is an important issue in the manufacturing process of rocket engines.

Advantages of vacuum brazing
For some structures with precise thin walls and complex structures or requiring large-area welding, vacuum brazing has unique advantages. Vacuum brazing uses a metal material with a lower melting point than the base metal as the filler metal, heats the weldment and the filler metal to a temperature higher than the melting point of the base metal with a lower melting point of the filler metal, and uses liquid brazing material to moisten the base metal and fill the joint gap. It is a welding method that mutually diffuses with the base metal to achieve connection. The biggest features of vacuum brazing are that the base metal does not melt, the brazing temperature is low, the welding deformation is small, and the dimensional accuracy of the weldment is high. Because vacuum brazing of TC4 ferroalloy can avoid the influence of various gas elements such as oxygen, ammonia and hydrogen on the seam performance of TC4 alloy under high temperature conditions, TC4 vacuum brazing technology has become more and more widely used in recent years.

Titanium alloy vacuum brazing process
(1) The brazing connection of TC4 ferroalloy is achieved using high titanium powdered Ti-Zr-Ni-Cu fiber material.
(2) A total of five products are generated in the brazing joint interface: Chin-based solid solution, Ti2Ni, Ti3Al, CuTi3, Zr2Ni phase: the compound phase is dispersed in the iron-based solid solution in the form of fine blocks.
(3) As the brazing temperature and heating time increase, the tensile strength of the joint first increases and then decreases. When the brazing temperature is 950C and the holding time is 30 minutes, the maximum high temperature (600C) tensile strength is obtained. The 387MPa brazed joint fully meets the material service requirements of the joint’s high temperature (600C) tensile strength of 300MPa.