The engine is the heart of an airplane. Engine fans, high pressure compressor components and blades and other rotating parts, not only to withstand great stress, but also to have a certain degree of heat resistance. Such conditions are too hot for aluminum; It's too dense for steel. Titanium is the best choice. Titanium has good high temperature strength, creep resistance and oxidation resistance at 300~650℃.At the same time, an important performance index of the engine is the thrust-to-weight ratio, that is, the ratio of the thrust produced by the engine to its mass. The thrust-to-weight ratio of the earliest engines was 2 to 3, and can now reach 10. The higher the thrust-to-weight ratio, the better the engine performance. Using
titanium alloy to replace the original nickel base superalloy can reduce the engine mass and greatly improve the thrust-weight ratio of aircraft engine. Titanium is increasingly used in aircraft engines. In foreign advanced aircraft engines, the amount of high-temperature titanium alloy has accounted for 25%~40% of the total engine mass. For example, the amount of titanium alloy of the third generation engine F100 is 25%, and the amount of titanium alloy of the fourth generation engine F119 is 40%.
