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The performance and application of zirconia products

The melting point of zirconia is 2677℃, the density is 6.10g/cm3 (tetragonal crystal type), the Mohs hardness is 6.5, the average expansion coefficient at 20-1000℃ is 10×10-6/℃, and the thermal conductivity is 2.09W/ (MK). The products with dense and fine crystalline structure of zirconia have high mechanical strength, and the compressive strength at room temperature can reach 2100MPa. Zirconia products are very stable when used in an oxidizing atmosphere, and they are also stable when used in a reducing atmosphere. Zirconia is a weakly acidic oxide, which is resistant to the erosion of acidic or neutral slag, but will be corroded by alkaline slag. Zirconia crucible products can be used repeatedly when smelting platinum, palladium, rhodium and other metals.

Zirconia does not wet with molten iron or steel, so it can be used as a lining for steel drums and used as a nozzle brick in continuous steel casting. The resistivity of zirconia drops sharply at high temperature, and it has electrical semiconductivity. The heating element made of stabilized zirconia can be used as a heating element when it is energized at high temperature. Zirconia can also be used as a high-temperature solid electrolyte for high-temperature fuel cells, flue gas oxygen measuring heads, and molten steel oxygen measuring heads. In addition, the stabilized zirconia is processed into rods or particles of appropriate fineness, which can be used for flame spraying or plasma spraying as a high-temperature ceramic coating.

The above is the article on how to manufacture zirconia products brought to you by the editor, I hope it can be helpful to friends who are engaged in this field.


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