Low-expansion ceramic billet as well as preparation method and application thereof

Abstract

The invention provides a preparation method of a low-expansion ceramic billet. The preparation method comprises the following steps: providing the following raw materials in percentage by weight: 15 to 20 percent of cordierite, 16 to 20 percent of petalite, 16 to 20 percent of talc, 4 to 7 percent of mullite and 40 to 43 percent of kaolin; carrying out wet ball grinding on the talc, the mullite, the kaolin and a solvent, thus preparing an initial billet with particle size distribution D97 being 12 to 15 micrometers; carrying out wet ball grinding on the cordierite, the petalite and the initialbillet, thus preparing the low-expansion ceramic billet with particle size distribution D97 being 60 to 80 micrometers. According to the preparation method, the use amount of the petalite is reduced,and the raw material cost is reduced; furthermore, the prepared low-expansion ceramic billet is applicable to relatively-low-cost rolling forming of equipment, but not limited to isostatic forming.

Description

technical field [0001] The invention relates to the technical field of ceramic materials, in particular to a low-expansion ceramic blank and its preparation method and application. Background technique [0002] Ceramic materials are divided into three categories according to their thermal expansion coefficient α: high expansion type, medium expansion type and low expansion type. Among them, the thermal expansion coefficient α of the low expansion type is <2×10 -6 ·℃ -1 . Low-expansion ceramics have excellent performance in thermal shock resistance and are widely used, so the development of low-expansion ceramics is of great significance. [0003] Traditional low-expansion ceramics use spodumene or petalite as the main raw material. With the increasing output of lithium batteries, the supply of lithium ores such as spodumene and petalite is becoming increasingly tight, and the price of lithium ore is also increasing rapidly. The cost of raw materials for traditional low...

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Problems solved by technology

At present, cordierite is a substitute for spodumene and petalite, and its application has great limitations: if the thermal expansion coefficient of ceramic products is to meet the standard of low expansion, the proportion of cordierite in the ceramic blank must be The proportion of plastic clay in the ceramic blank reaches more than 65%, which leads to the failure of the proportion of plastic clay in the ceramic blank to reach more than 40%, so this ceramic blank is only suitable for the forming process of dry pressing and isostatic pressing.

However, compared with traditional roll forming, isostatic pressing has disadvantages such as high equipment cost, narrow application range and low production efficiency.

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