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What is a zirconia crucible

Date:2022-03-30 09:56:31       Number of views:

The purity of zirconia crucible reaches 99.9, the density is 6.00, and the maximum service temperature is 2200 degrees. It is mainly used for smelting precious metals, with good thermal stability. It is mainly used to melt precious and rare metals. Zirconia crucible has good high-temperature stability and is an ideal experimental high-temperature refractory product.


The melting point of zirconia is higher than that of zirconium, up to 2700 ℃. It is one of the materials with the best fire resistance in nature.


Its thermal conductivity is poor, but it has strong conductivity and strong corrosion ability. Even if it is heated to more than 1900 ℃, it will not interact with molten aluminum, iron, nickel, platinum and other metals, silicates and acid slag. Therefore, it can be used to manufacture crucibles, refractory pipes, heat-resistant glass and heat-resistant enamel for smelting precious metals. Adding zirconia to enamel and glass can enhance their resistance to acid and alkali corrosion.


The high-temperature furnace lined with zirconia will not increase much after heating, and the temperature change has little impact on it. The furnace body will not produce cracks due to thermal expansion and cold contraction, which can greatly prolong the service life of the furnace. Using zirconia as refractory and adding 5% calcium oxide as stabilizer, its heat-resistant temperature is 500 degrees higher than that of alumina, and its thermal insulation capacity is three times higher than that before. Adding white zirconia into ceramics can make ceramics whiter, brighter, more heat-resistant and increase their strength. Making high-temperature insulating porcelain bottles with this kind of ceramics has strong insulation ability and small expansion coefficient.


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