Corrosion-resistant saggar as well as preparation method and application thereof

Abstract

The invention relates to the field of refractory materials and particularly provides a corrosion-resistant saggar as well as a preparation method and an application thereof. The corrosion-resistant saggar comprises a bottom material and a surface material, wherein the bottom material is mainly prepared from specific content of kaolin, talc, alpha-alumina, high bauxite, high bauxite with the particle size not larger than 0.5 mm, flint clay with the particle size not larger than 1 mm and flint clay with the particle size being 1-2 mm; the surface material is mainly prepared from specific contentof alumina with the particle size not larger than 0.7 mu m, alpha-alumina with the particle size not larger than 46.9 mu m, zirconium silicate with the particle size not larger than 46.9 mu m, zirconium silicate with the particle size not larger than 1 mm and cordierite with the particle size being 0.5-1.25 mm. The corrosion-resistant saggar has the advantages of low cost, high cost performance,good corrosion resistance and long service life.

Description

technical field [0001] The invention relates to the field of refractory materials, in particular to a corrosion-resistant sagger, a preparation method and an application thereof. Background technique [0002] At present, lithium cobaltate and ternary lithium batteries are widely used cathode materials for lithium batteries in China, and most of the cathode materials are produced by high-temperature solid-phase synthesis in refractory kilns. During the synthesis process, bearing Sagger materials for burning are generally cordierite, mullite, quartz and corundum. Among these materials, cordierite composite mullite sagger products are the most widely used. This type of sagger is made of cordierite, mullite, and corundum as raw materials, with some clay and micropowder added as a binder, and pressed into shape under a high-tonnage press. After constant temperature curing, it is fired in a refractory kiln. The product is obtained. Moreover, the average index of domestic and for...

AI Technical Summary

Problems solved by technology

In actual production, it is often the combined influence of two factors that causes the service life of the sagger to be low

The positive electrode material of the lithium battery first corrodes the sagger, especially the lithium oxide at high temperature has a very high activity, it will react with the refractory material in the sagger, and a liquid phase similar to glass is formed at a high temperature, and these liquid phase components are in the The change of viscosity continuously erodes the solid phase surface of the sagger, and the pores on the surface of the sagger will also provide channels for these corrosion products. As time accumulates, the glassy alkali metal oxides continue to penetrate deeper into the sagger. Infiltration at the place, the channel is getting deeper and deeper, more and more impurities are produced by erosion, and low-melting ore phases such as eucryptite, lithium silicate, and lithium aluminosilicate are formed, and the entry and exit of the sagger in the kiln It is found that the expansion coefficient of the impurity mineral phase is quite different from that of the sagger, and the alternation of cold and heat will cause peeling and cracking on the surface of the sagger, thus affecting the service life of the sagger