Aerospace

In the aerospace field, the application of grease is crucial. Aerospace equipment operates in extreme environments, such as high temperatures, high pressures, high vacuum, and low temperatures, which requires the grease to not only have excellent lubrication performance but also to remain stable under these extreme conditions to ensure the safety and reliable operation of the aircraft. This article will explore the application and importance of grease in the aerospace field.

1. Basic Classification and Characteristics of Grease

Grease is a semi-solid lubricating material with good adhesion and high-temperature resistance. In the aerospace field, grease is mainly used for components that need to maintain lubrication for a long time, such as bearings and gears. Compared to lubricating oil, grease has better sealing and adhesion, allowing it to maintain stable lubrication performance in extreme environments. Based on its basic functions and usage, grease in the aerospace field can be divided into four categories: aviation mechanical grease, aviation component and instrument grease, aviation protective grease, and aviation sealing grease.

1. Aviation Mechanical Grease

Aviation mechanical grease is mainly used to reduce friction and wear in aviation machinery, preventing parts from scratching and jamming. For example, certain open hinge joints on aircraft fuselages use special No. 221 grease for lubrication, while aircraft wheel bearings use No. 4 high-temperature grease to reduce friction. This type of grease can maintain good lubrication performance even in high-temperature and high-pressure environments, ensuring the normal operation of mechanical components.

2. Aviation Component and Instrument Grease

Aviation component and instrument grease is used to reduce friction and wear between components and instruments, ensuring stable long-term operation. For example, the motor bearings of electric mechanisms use special No. 7 precision instrument grease to reduce friction, while the transmission mechanism of aerial cameras uses No. 3 instrument grease for lubrication. This type of grease performs excellently in precision components, ensuring the accuracy and stability of components and instruments.

3. Aviation Protective Grease

Aviation protective grease is used to protect the surfaces of parts and prevent corrosion. For example, No. 4 anti-rust grease is used to preserve aircraft engines, preventing oxidation and corrosion during long-term storage. This type of grease typically contains rust inhibitors and other additives, forming a protective film to shield parts from corrosion and erosion.

4. Aviation Sealing Grease

Aviation sealing grease is used to seal various conduit threaded joints and other connection points in fuel systems, hydraulic systems, etc. For example, No. 5 gasoline-resistant sealing grease is resistant to gasoline and kerosene and can be applied to the conduit joints of aircraft fuel systems. This type of grease has excellent sealing performance, preventing liquid and gas leaks, ensuring the normal operation of the system.

2. The Importance of High-Altitude Grease

High-altitude grease is a special type of grease designed to provide effective lubrication for aircraft engines, turbines, and various aviation accessories operating at high altitudes. Compared to ordinary grease, high-altitude grease needs to remain stable under extreme conditions, such as high temperatures, high pressures, and low temperatures. It plays a very important role in the aerospace field.