Regarding the ceramic balls we have ZrO2 ceramic balls,Silicon nitride ceramic balls, SiC ceramic balls.
The density of ZrO2 ceramics is 5.95-6.05 g/cm3, in the four generally used ball ceramics (Si3N4, SiC, Al 2O3,ZrO2), ZrO2 has the best toughness (more than 8MPa·m1/2) and its coefficient of thermal expansion (10.5×10-6/℃) is near that of metals, and matches well with metals, however the dimension stability of ZrO2 is not well, the dimensions variation with temperature is bigger than that of the other three ball ceramics. The rolling contact failure form is crushing, in some key component the stability of ZrO2 ceramics is not as well as that of Si3N4. ZrO2 ceramics is self-lubricating material, and can well settle the problem of pollution and inconvenience of adding lubricant.
Field of application ZrO2 ceramics can be used in the manufacture equipment of semiconductor, LCD; the manufacture equipment of electric plating, synthetic fibre, and optical film; the heat treating furnace, vacuum facility, etc.ZrO2 ceramics can also be used in the fields of ball bearings, machining tools, various guide wheel, kinds of valves and kinds of severe conditions.
The usually used ceramic materials to produce ceramic bearings are Si3N4,SiC, Al2O3 and ZrO2. in the four typical materials, SiC has its obvious characteristics.
The key applications of SiC ceramic bearings
Industry
Working conditions
Characteristic
Oil
High temperature, high pressure
Resistance to high temperature, corrosion and wear
Chemistry
Strong acid, strong alkali
Resistance to corrosion and wear
High temperature and oxidation
Resistance to high temperature and corrosion
Mechanism
Engine
Resistance to high temperature, thermal-shock resistance, good strength
Grinding
Resistance to wear
Light industry
Paper stuff and its wastewater
Resistance to corrosion and wear
High temperature
Resistance to high temperature, Good heat conductivity
Large power rejection of heat
Good heat conductivity
Nucleus, laser
High temperature water with boron, Large power
Resistance to radiation, good strength and good stability
Metallurgy
High temperature gas
Resistance to high temperature, corrosion and oxidation
Other
Machine-shaping
Resistance to corrosion and wear
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