Commonly used materials for ceramic bearings

Ceramic bearings can be used in various harsh working conditions such as high speed, high temperature, low temperature, strong corrosion, strong magnetic field, vacuum, and high pressure. In order to facilitate the correct selection and use of ceramic bearings, the main characteristics of ceramic bearings are introduced as follows:

1) The hardness of ceramic materials with high bearing capacity can Dongsheng Bearing be up to 2 times that of bearing steel, and the elastic modulus is 1.5 times that of bearing steel. Therefore, the bearing capacity of ceramic bearings is also much higher than that of bearing steel bearings.

2) Good heat resistance The strength of the ceramic material decreases very little at high temperature, and it still maintains high strength and mechanical properties even at 800 degrees Celsius. At the same time, the expansion rate of the ceramic material is only 22% of that of the bearing steel, so the high temperature dimensional stability is good. .

3) The working speed of the ceramic ball bearing with high limit speed can reach more than 1.3 times the limit speed of the bearing steel bearing of the same type.

4) The temperature rise of ceramic ball bearing with small friction temperature rise when ruing at a speed of 18000r/min is about 60% of the temperature rise of bearing steel bearing under the same conditions.

5) Small friction loss For bearings of the same type, the mass of ceramic material is smaller than that of steel, the centrifugal force and gyroscopic moment of the rolling element during operation are small, and the spin sliding is small, so the friction loss is significantly lower than that of bearing steel bearings.

6) High durability Ceramic materials have high hardness and excellent wear resistance. The working life of ceramic ball bearings is generally more than 2 times that of ordinary bearing steel bearings.

7) Good corrosion resistance Ceramic materials can resist the corrosion of various inorganic acids, organic acids, salts, alkalis and molten metals such as hydrochloric acid, sulfuric acid, nitric acid, and caustic soda, but in hydrogen fluoride and molten iron, their corrosion resistance is poor. Be careful when using it.

8) Good insulation, low magnetic permeability is almost an insulator, magnetic permeability is far less than 0.1H, suitable for any non-magnetic parts.

9) Self-lubricating ceramic bearings can achieve self-lubricating. At present, the most widely used bearing material is silicon nitride.3