A kind of high temperature porcelain and its preparation method

Abstract

The invention provides a high-temperature porcelain and a preparation method thereof. The high-temperature porcelain provided by the invention is prepared from raw materials comprising the following mass ratio materials: 20% to 40% of potassium feldspar; 10% to 20% of quartz; 5% to 8% of plasticizer; 4% to 6% of activated alumina %; Kaolin washing mud 40% to 60%; dolomite powder 0.2% to 0.8%. The present invention introduces activated alumina and dolomite into the mud washing system of potassium feldspar, quartz and kaolin, and mixes the two in a specific ratio, and then cooperates with a plasticizer, which can promote the system to produce more mullite during the reaction process crystal, and the microcrystalline structure of activated alumina plays a whisker toughening role in the sintering reaction of the porcelain body, which can improve the thermal stability and mechanical strength of the porcelain; dolomite can accelerate the high-temperature sintering reaction and generate sufficient The liquid phase filling ensures sufficient glass phase without affecting the reaction between activated alumina and other components, and improves the transmittance of porcelain on the basis of ensuring thermal stability and mechanical strength.

Description

technical field [0001] The invention relates to the technical field of ceramic materials, in particular to a high-temperature ceramic and a preparation method thereof. Background technique [0002] High-temperature porcelain is a kind of special ceramics, which refers to ceramic materials whose melting temperature is above the melting point of silicon oxide (1728℃) and firing temperature is above 1200℃. Compared with low-temperature porcelain, high-temperature porcelain is fired at high temperature, with high crystal density, high ceramic surface strength, fine and white porcelain, and can be fired at high temperature again; it has the characteristics of high temperature resistance, high hardness, good electrical properties, etc. As a high temperature structural material, it is used in aerospace, machinery, chemical industry, metallurgy and other fields. [0003] However, compared with low-temperature porcelain, the formula design of high-temperature porcelain is more diffi...

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Problems solved by technology

[0003] However, compared with low-temperature porcelain, the formula design of high-temperature porcelain is more difficult. High-temperature porcelain needs to be fired under high-temperature conditions, and uncontrollable changes in grain boundaries and microstructures will occur, which will affect material properties; There is no mature mechanism for the relationship between performance change and ceramic chemical composition, and there is not a simple one-to-one correspondence between its performance and materials or additives. For example, adding a reinforcing agent to improve strength often affects the thermal stability of the material And the apparent light transmittance of the material, the introduction of additives to improve the light transmittance will easily affect the mechanical properties of the material, etc., and the interaction between components has no mature rules, and it is difficult to balance and reconcile different properties, resulting in the formulation of It is very difficult to improve and design

At present, high-temperature porcelain on the market generally has defects such as poor high-temperature deformation resistance, poor mechanical strength, and poor appearance quality, which affect the application of high-temperature porcelain

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