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Ceramic bearing

Silicon nitride ceramic bearings as an important mechanical base component are leading the way in the world of new materials because of their excellent properties unmatched by other bearing. Silicon nitride isn’t hardest of industrial ceramics, not the most ductile, but it is considered to the best combination of mechanical and physical properties in bearing applications high performance.

In recent years, silicon nitride ceramic bearings in aerospace, marine, nuclear industry, petroleum, chemical, textile industry, machinery, metallurgy, electric power, food, locomotives and subways, high-speed machine tools and scientific research in the field of national defense and military technology to indispensable alternative role is gradually recognized.

Ceramic bearing's features

1. Heat Resistance

General steel bearings use temperature more than 120℃ sheshid ,the hardness will be reduced, rolling life will decline. The silicon nitride has good temperature characteristics, especially suitable for high temperature environment.

2. Centrifugal

The density of silicon nitride is about 3.24×103kg/m3, while the density of bearing steel is about 7.8×103kg/m3, which is only about 40% of the density of bearing steel, so when the rolling body uses bearings, it can inhibit the increase of rolling body load caused by centrifugal force when rotating at high speed.

3. Coefficient of linear expansion

The linear expansion coefficient of silicon nitride is about 1/4 of that of bearing steel, so the size change with temperature change is small, so it is beneficial to use in environments with large temperature changes.

4. Hardness, coefficient of elasticity, Poisson’s ratio

Because the elastic coefficient of silicon nitride is about 1.5 times higher than that of bearing steel, elastic deformation of the relative load is small and relative load is higher in steel.

5. Corrosion resistant, non-magnetic, insulating

When steel bearings are used in machinery used in chemical machinery equipment, food, marine and other sectors, corrosion is a problem. In a strong magnetic environment, steel bearings are used, and the fine powder worn down from the bearing itself is absorbed between the rolling elements and the rolling surface, which will become the main reason for the bearing’s early spalling damage and increased noise.

Ceramic bearings
Ceramic bearing SPA205
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