High-temperature porcelain and preparation method thereof

Abstract

The invention provides a high-temperature porcelain and a preparation method thereof. The high-temperature porcelain is prepared from, by mass, 20-40% of potassium feldspar, 10-20% of quartz, 5-8% ofa plasticizer, 4-6% of activated alumina, 40-60% of kaolin washing mud, 0.2-0.8% of dolomite powder. The activated alumina and dolomite powder are introduced into the potash feldspar, quartz and kaolin washing mud system, and are mixed according to a specific ratio, and then are mixed with the plasticizer, so that the system can be promoted to generate a large amount of mullite crystals in the reaction process; the microcrystalline structure of the activated alumina plays a role in whisker toughening in a porcelain body sintering reaction, so the thermal stability and the mechanical strength of the formed porcelain can be improved; and the dolomite powder can accelerate the high-temperature sintering reaction to generate sufficient liquid phase filling and ensure the generation of enough glass phase without influencing reactions of the activated alumina with other components, so the light transmittance of the finished porcelain is improved on the basis of ensuring the thermal stabilityand the mechanical strength.

Description

technical field [0001] The invention relates to the technical field of ceramic materials, in particular to a high-temperature porcelain and a preparation method thereof. Background technique [0002] High-temperature porcelain is a kind of special ceramics, which refers to ceramic materials with a melting temperature above the melting point of silicon oxide (1728°C) and a firing temperature above 1200°C. Compared with low-temperature porcelain, high-temperature porcelain is fired at high temperature, with high crystallization density, high porcelain surface strength, fine and white porcelain, and can be fired at high temperature again; it has the characteristics of high temperature resistance, high hardness, and good electrical properties. 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 ...

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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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