Ceramic bearings have the characteristics of high temperature resistance, cold resistance, wear resistance, antimagnetic electrical insulation, oil-free self-lubrication, and high speed. Can be used in extremely harsh environments and special working conditions. Due to these characteristics of ceramic bearings, ceramic bearings are widely used in aviation, aerospace, navigation, petroleum, chemical industry, automobile, metallurgy, electric power, textile, pumps, medical equipment, scientific research and national defense and military fields.
All-ceramic bearings refer to bearings whose rings and rolling elements are made of all-ceramic materials. There are three types: zirconium oxide (ZrO2), silicon nitride (Si3N4), and silicon carbide (SiC). Different materials are matched according to different operating conditions. retainer.
Alumina ceramic bearings use alumina ceramics with an alumina content of 99% as the material. Its rolling elements also use alumina ceramics.
The main properties of alumina are as follows:
High wear resistance; excellent dielectric properties in the high frequency range from DC to gigahertz; resistant to corrosion by various strong acids and alkalis at high temperatures; good thermal conductivity; excellent dimensional and shape stability; Higher strength and hardness. Alumina with a purity of 94% to 99.5% can easily form metal composites and can be used in high-temperature fields.
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