Production method of lithium non-expansion heat-resistant ceramic

Abstract

The invention relates to a production method of lithium non-expansion heat-resistant ceramic, comprising the following steps: pre-compounding a raw material by adopting industrial lithium salts of lithium carbonate, lithium hydroxide, lithium phosphate, and the like, siliceous and aluminiferous ceramic and fireproof materials at the temperature of 650-1,150 DEG C, and compounding the raw material according to a corresponding formula and proportioning by a corresponding prescription to prepare a compound with the following components by weight percent: 3.0-8.5 percent of Li2O, 13-30 percent ofAl2O3 and the balance of SiO2; grinding; molding; drying; and sintering at the temperature of 1,240-1,410 DEG C. The method uses the industrial lithium salts to compound high-purity lithium mineralizers, thereby preparing the high temperature ceramic with a thermal expansion coefficient near zero.

Description

technical field [0001] The invention relates to an industrial lithium salt synthesized lithium non-expansion (also known as zero-expansion) heat-resistant ceramic material and its application. Background technique [0002] In modern production and life, there are often many places where it is necessary to use non-metallic materials that are resistant to high temperature, corrosion, and rapid cooling and rapid heating, such as thermal kiln tools in industry, crucibles for calcining various powder materials (boxes) Bowl), heat exchanger, spark plug, high temperature nozzle, heating element, heat conduction plate, etc. Heat-resistant cooking utensils, induction cooker panels, etc. for civilian use. However, general ceramic materials have a high thermal expansion coefficient and cannot be used under rapid cooling and rapid heating conditions. Only lithium materials can be made into ceramics with a theoretical thermal expansion coefficient of zero. [0003] Lithium-containing n...

AI Technical Summary

Problems solved by technology

[0004] 1. The firing range of lithium ceramics is very narrow, and mineral raw materials such as spodumene contain Na 2 O, K 2 O, CaO and other basic oxides are relatively high, and these basic oxides will make the firing range narrower. If it reaches a lithium content with a high zero expansion, it will produce instant melting results (firing temperature almost equal to the melting temperature), so that it cannot be engaged in ceramic production, and can only be made into glass products

[0005] 2. If you want to expand the firing range and produce normally, you must reduce the lithium content. The lithium content of lithium porcelain produced with natural pyroxene raw materials should not exceed 3%.

But such a high Li 2 The O content cannot be produced by ceramic technology, and the temperature resistance is low and the cost is high, so it has little practical significance

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