Application of Polyimide in aero-engine

Application of Polyimide in aircraft engine

In recent years, high-performance aero-engine technology has developed rapidly. In order to further improve the performance of aero-engines, more and more resin-based composite materials are used to replace metal materials in aero-engines in order to achieve the purpose of lightweight. Among them, polyimide resin-based composite materials Because of its excellent heat resistance, it is widely used in aero engines and aircraft

Aero-engine bushings are one of the more mature applications of polyimide resin-based composite materials in engines. The bushing is a ring sleeve that plays a role of reducing wear of the liner. Its friction coefficient is small, and the wear resistance is good. It can reduce the wear of the shaft, and the bush can be replaced to a certain extent. Engine adjustable blade bushing is a typical application of aero engine bushings. It is a key component used in the assembly of adjustable blades of aero engine high pressure compressors. It can reduce wear and protect the blade shaft. Due to the harsh environment, it is required The selected material has the properties of high temperature resistance (260 degrees -400 degrees), self-lubricating, wear resistance, corrosion resistance and long-term service life. At the same time, it cannot wear the blade shaft and casing assembly holes. It is a key material to ensure the stable operation of the engine. Although the size of the bushing structure is small, the number of bushings for a single engine is as many as hundreds of pieces. The use of polyimide composite bushings instead of metal bushings can achieve a better weight reduction effect, while reducing wear and Excellent and better durability, so it is widely used in military and civil aviation engines.

Foreign research on polyimide composite bushings for aero-engines began in the late 1960s. After more than 40 years of research and development, polyimide composite bushings have formed a variety of material systems, mainly including graphite filling Composite material bushing, fiber braided composite material bushing, chopped fiber composite material bushing and other types.