Production method of zirconia plates

Abstract

The invention provides a production method of zirconia plates. The production method of the zirconia plates is applied to the technical field of production and processing of zirconia plates and includes the steps of firstly, adding water as binder into monoclinic ZrO2 and TiO2, mixing, and compressing mixture in a mould to obtain a material blank; secondly, putting the material blank into a high temperature furnace, sintering to obtain ZrTiO4, and breaking the sintered ZrTiO4; and thirdly, mixing the broken ZrTiOr4 and the ZrO2, and compressing the mixture in the mould to obtain a zirconia plate blank, and sintering the zirconia plate blank into the high temperature furnace to obtain a finished zirconia plate. The zirconia plate produced by the production method has thermal shock resistance and stability evidently better than those of the zirconia plate produced in the prior art. The zirconia plate also has fine liquid steel scouring resistance, fine slag erosion resistance and prolonged service life.

Description

technical field [0001] The invention belongs to the technical field of production and processing of zirconium oxide zirconium plates, and more specifically relates to a preparation method of zirconium oxide zirconium plates. Background technique [0002] The zirconia zirconium plate is used for the slag-retaining gate valve for converter tapping, embedded in the aluminum-carbon slide plate, which has excellent resistance to molten steel erosion and slag erosion, and can greatly improve the slag-retaining valve under the condition of ensuring a certain thermal shock stability. The service life of the gate valve; it can also be used as a backing plate in the firing process of magnetic materials to prevent the harmful substances of the refractory materials used in the firing equipment of magnetic materials from polluting the magnetic materials (such as SiO 2 Wait). [0003] The zirconium plates currently used all use fused stabilized zirconia as the main raw material. Accordin...

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Problems solved by technology

This production method mainly has the following disadvantages: First, the product has poor thermal shock resistance and short service life

In order to ensure the performance of zirconia, most zirconium plates are fired by self-bonding sintering between high-temperature zirconia, and sintering accelerators are rarely added. The stable phases (tetragonal and cubic phases) in the raw materials used to produce zirconium plates account for about 42%. ~65%, and the rest is monoclinic phase at room temperature. From room temperature to 1650°C, the volume change is large (8.2%). When the product is subjected to thermal shock, it is easy to crack, resulting in poor thermal shock resistance; second, the product is more difficult to sinter

The refractoriness of zirconia is greater than 2700°C. When using self-bonding sintering, a certain amount of zirconia powder must be added, and it can be fired at 1700-1800°C; third, the product is easily deformed and the yield is low.

The zirconia micropowder is monoclinic zirconia, which is easy to react with stabilizers such as calcium oxide and magnesium oxide in the stabilized zirconia during the firing process, destroying the structure of the stabilized zirconia in the raw material, resulting in deformation and cracking of the product

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