Titanium alloys can be classified into heat-resistant alloys, high-strength alloys, corrosion resistant alloys (ti-mo, ti-pd alloys, etc.), low-temperature alloys and special functional alloys (ti-fe hydrogen storage materials and ti-ni memory alloys).
Although titanium and its alloys have not been used for a long time, they have won many honors due to their superior performance. The first prize was "space metal". It is light weight, strength and high temperature resistance, especially suitable for the manufacture of aircraft and various spacecraft. About three quarters of the titanium and titanium alloys produced in the world are used in the aerospace industry. Many of the original aluminum alloy parts, are converted to titanium alloy.
Titanium alloy is mainly used in aircraft and engine manufacturing materials, such as forged titanium fan, compressor disc and blade, engine hood, exhaust device and other parts, as well as aircraft girder and frame. The spacecraft mainly USES the high ratio of titanium alloy.
Strength, corrosion resistance and low temperature resistance to manufacture pressure vessels, fuel tanks, fasteners, instrument straps, frames and rocket casings. Artificial earth satellites, lunar modules, manned spacecraft and space shuttle also use titanium alloy plate welding parts.
Modern aircraft have a maximum speed of 2.7 times the speed of sound. Flying so fast at supersonic speed, the plane will rub against the air and generate a lot of heat. At 2.2 times the speed of sound, aluminum alloys can't stand it. High temperature resistant titanium alloy must be used. When the thrust-weight ratio of aero-engine increases from 4 ~ 6 to 8 ~ 10, and the compressor outlet temperature increases correspondingly from 200 ~ 300℃ to 500 ~ 600℃, the original low-pressure compressor disc and blade made of aluminum must be converted to titanium alloy.
In recent years, scientists have made new progress in the research of properties of titanium alloys. Initial titanium alloy composed of titanium, aluminum, vanadium, the highest working temperature is 550℃ ~ 600℃, and the new aluminum titanide (TiAl) alloy, the highest working temperature has been increased to 1040℃. Using titanium alloy instead of stainless steel to make high-pressure compressor discs and blades can reduce the structural weight. For every 10% reduction in weight, the aircraft saves 4% fuel. For a rocket, each 1kg weight loss adds 15km to its range.
