ZrO2 ceramic balls
1. The performances of ZrO2
Pure ZrO2 is white, and appears yellow or grey when containing impurities, the density of ZrO2 is 5.6g/cm3, melting point being 2715°C. ZrO2 has good performance of heat resistance, insulation and good corrosion resistance.
The generally used ZrO2 is TZP, the added Y2O3 inhibits the crystal transformations of ZrO2, and TZP has the best toughness in all PSZ even in all polycrystalline ceramics.
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/°C) 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.
2. 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.
Ceramic balls normal specification
Specs(Dia.) | Specs(Dia.) | ||
in | mm | in | mm |
3/32'' | 2.381 | 5/32'' | 3.969 |
3/16'' | 4.763 | 7/32'' | 5.556 |
15/64'' | 5.953 | 1/4'' | 6.350 |
17/64'' | 6.747 | 9/32'' | 7.144 |
5/16'' | 7.938 | 3/8'' | 9.525 |
7/16'' | 11.112 | 3/4'' | 19.050 |
1'' | 25.400 | 1 1/4'' | 31.75 |
precision zirconia ceramic bearing balls(ZrO2 balls)




