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Type characteristics of zirconia ceramic bearings
Pure ZrO2 is white, and appears yellow or gray when containing impurities. It generally contains HfO2 and is difficult to separate. The world's proven zirconium resources are about 19 million tons, and zirconium oxide is usually produced by purifying zirconium ore. There are three crystal states of pure ZrO2 under normal pressure: monoclinic zirconia (m-ZrO2), tetragonal zirconia (t-ZrO2) and cubic (Cubic) zirconia (c-ZrO2). Types exist in different temperature ranges and can be converted into each other:
Pure ZrO2 is white, and appears yellow or gray when containing impurities. It generally contains HfO2 and is difficult to separate. The world's proven zirconium resources are about 19 million tons, and zirconium oxide is usually produced by purifying zirconium ore. There are three crystal states of pure ZrO2 under normal pressure: monoclinic zirconia (m-ZrO2), tetragonal zirconia (t-ZrO2) and cubic (Cubic) zirconia (c-ZrO2). Types exist in different temperature ranges and can be converted into each other:
temperature density
Monoclinic zirconia (m-ZrO2) <950℃ 5.65g/cc
Square zirconia (t-ZrO2) 1200-2370℃ 6.10g/cc
Cubic zirconia (c-ZrO2) >2370℃ 6.27g/cc
The above three crystal states have different physical and chemical properties. In order to obtain the required crystal form and performance in practical applications, different types of stabilizers are usually added to make different types of zirconia ceramics, such as partially stabilized zirconia. PSZ), when the stabilizer is CaO, MgO, Y2O3, it is expressed as Ca-PSZ, Mg-PSZ, Y-PSZ, etc. respectively. Tetragonal zirconia composed of metastable t-ZrO2 is called tetragonal zirconia polycrystalline ceramic (Square zirconia polycrysta, TZP). When the added stabilizers are Y2O3 and CeO2, they are expressed as Y-TZP, Ce-TZP, etc. respectively.
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