What are the advantages and characteristics of ceramic bearings?

With the development of today's society, the application fields of ceramic bearings are becoming more and more extensive, which has made tremendous contributions to the development of people's life and technology. So do you understand the advantages of ceramic bearings and its own characteristics? The following will take you to the inner world of the ceramic bearings!

Bearing advantages:

High temperature resistance: The thermal expansion coefficient of the ceramic ball is small. In the high temperature environment, the bearing ball will not expand due to temperature, which greatly improves the operating temperature of the whole bearing. The temperature of the ordinary bearing is about 160 degrees, and the ceramic ball can reach 220. Above the degree.

High speed: ceramic ball has oil-free self-lubricating property, ceramic ball has small friction coefficient, so ceramic ball bearing has high speed. According to statistics, the bearing of ceramic ball is more than 1.5 times the speed of general bearing.

Long life: the ceramic ball can be free of any grease, which means that even if the grease is dry, the bearing can still work, thus avoiding the premature bearing damage caused by the dry grease in the ordinary bearing. According to our test and some customers The feedback after using the ceramic ball has a service life of 2-3 times that of a normal bearing.

Insulation: Last but not least, insulation, ceramic ball bearings can be used to insulate the inner and outer rings of the bearing. Because the ceramic ball is an insulator, ceramic balls can be used between the inner and outer rings of the bearing to achieve insulation. The effect is that the bearing can be used in an electrically conductive environment. The rolling bearing is composed of a ferrule, a rolling element, a retainer, a grease, and a sealing member. When the rolling element is made of a ceramic material, the rolling bearing is defined as a ceramic ball bearing.

The characteristics of ceramic bearings:

Practice has proved that as a bearing material, it must also have dimensional stability at different temperatures to ensure that the bearing maintains precise dimensions and precise fit under temperature changing working conditions. In special circumstances, it must also have corrosion resistance and decomposition resistance. ability. In summary, ceramic materials used to make rolling bearing parts should have the following performance characteristics:

1) Low density. Due to the reduced density of the rolling elements, the centrifugal load is also reduced at high speeds, allowing operation at higher speeds.

2) Medium elastic modulus. If the modulus of elasticity is too large, the bearing capacity of the bushing will be reduced due to stress concentration.

3) The coefficient of thermal expansion is small. Reduce the sensitivity to temperature changes, making the bearing operating temperature range wider.

4) High compressive strength. High compressive strength is the need for rolling bearings to withstand high stresses.

5) High hardness and high toughness. These two characteristics combine to obtain better surface roughness; and can prevent damage from external particles and impact.

6) Good resistance to rolling contact fatigue and flaking failure mode.

7) Special occasions should have high temperature resistance, corrosion resistance and stability.

The ferrule and the rolling element contact point are subjected to an applied load and rotation, thereby repeatedly generating contact pressure and deformation. Due to the material properties of steel bearings, the main form of bearing failure is fatigue spalling, short fatigue life, and the application range is greatly limited. The ceramic material has low density, medium elastic modulus, small thermal expansion coefficient, high hardness, high temperature resistance, corrosion resistance, no magnetism, etc. Ceramic ball bearings with silicon nitride ceramic balls as rolling elements can significantly improve bearing contact fatigue life. It has greatly expanded the application fields of rolling bearings and has been widely used in various high-precision, high-speed machine tools, automobiles, racing cars, subways, motors, aero engines, petrochemical machinery, metallurgical machinery and other fields.