Titanium and titanium alloys have a series of outstanding advantages such as high specific strength, good corrosion resistance, and high-temperature resistance. They have developed into a promising metal structure material 121 in the modern aerospace industry. Since the United States first applied Ti-6AI-4V titanium alloy bolts to the B-52 bomber in the 1950s and achieved very good weight-reduction effects, various developed countries in the aviation industry have launched titanium alloy fasteners. Research and engineering applications.
The positive potential performance of the titanium alloy matches the carbon fiber composite material, which effectively prevents the galvanic corrosion of the fastener. It makes the titanium alloy the best connection material for the composite material. Therefore, with the continuous increase in the amount of Gr23 Ti-6Al-4V ELI Titanium Pipe and composite materials used in advanced military and civilian aircraft, the demand for titanium alloy fasteners is increasing. The use temperature of titanium alloy is 150-200C higher than that of aluminum alloy. For parts where aluminum alloy fasteners cannot be used due to the high operating temperature in the aircraft structure, titanium alloy will be a better choice. In addition, the inherent good elasticity and non-magnetism of titanium alloys also play a very important role in preventing the loosening of fastening bolts and preventing magnetic field interference.
In the US military and civilian aircraft, Gr7 Ti-0.2Pd Titanium Sheet has basically replaced alloy steel fasteners. The application of titanium alloy fasteners abroad has been very common. The amount of single titanium alloy fasteners for large civil aircraft has reached hundreds of thousands. At the same time, various new types of titanium alloy fasteners have also been continuously developed. In the late 1990s, with the introduction of foreign third-generation heavy fighter production lines and the development of domestic third-generation fighters, as well as the development of Dazu aviation subcontracting production, some titanium alloy fasteners began to be used in China's aviation industry. In recent years, with the development of China's aerospace industry, relevant domestic units have carried out a large number of research and development work on basic materials and fastener manufacturing technology. At present, the titanium alloy fasteners independently developed and produced in China have been in China. A large number of engineering applications have been obtained in modified aircraft and newly designed aircraft.
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