At present, China’s scientific research institutions engaged in the research of titanium alloy precision casting mainly include China Aerospace Beijing Institute of Aeronautical Materials, Shenyang Metal Research Institute of the Chinese Academy of Sciences, Shenyang Institute of Foundry of the Chinese Academy of Mechanical Sciences, Northwest University of Technology, Huazhong University of Science and Technology, Beijing University of Aeronautics and Astronautics, the Third Academy of Aerospace Science and Technology of China, Harbin University of Technology and other institutions. As shown in the figure, the titanium alloy casting with complex frame structure produced by Beijing Institute of Aeronautical Materials by investment casting has a structural dimension of 630mm × 300mm × 130mm。 Wang Honghong of Beijing Institute of Aeronautical Materials successfully produced a titanium alloy casing precision casting with a diameter of 1200mm in 2012, which is the largest titanium alloy precision casting in Asia today. The F-22, the fourth generation fighter aircraft of the US military, also uses a large number of titanium alloy precision castings. The total number of titanium alloy precision castings used inside the aircraft body is about 54. The two titanium alloy precision castings with the largest total weight are the front and rear wing castings, with the total weight of about 87kg and 58kg respectively. China’s J-20 has also adopted a large number of titanium alloy precision castings, of which the tail vertical tail is made of titanium alloy integral precision casting.
China’s titanium alloy precision casting technology began in the 1960s. In 1967, the Beijing Institute of Aeronautical Materials developed the titanium alloy precision casting graphite shell system, and successively cast the zero-stage fan hollow blades of aviation turbofan engines and the air conditioner supercharger blades for aircraft. During the period from 1981 to 1984, China introduced a complete set of manufacturing technology of titanium alloy precision casting surface ceramic shell from German TiAl company, and realized the comprehensive localization of material system and process equipment in 1987. Guizhou Anji Aviation precision Casting Co., Ltd., which was introduced and established in China, also formed a professional production capacity of large titanium alloy precision casting. The surface shell is one of the key technologies in precision casting of titanium alloy, mainly including the selection of refractory materials and adhesives, as well as the coating and shell making process. Titanium alloys have extremely active chemical properties at high temperatures and can react with almost all materials. Therefore, seeking core material with stable performance is the first problem to be solved in precision casting of titanium alloy.