Corrosion-resistant sagger, preparation method and application thereof

Abstract

The invention relates to the field of refractory materials, and specifically provides a corrosion-resistant sagger, a preparation method and an application thereof. The corrosion-resistant saggar includes a bottom material and a fabric, and the bottom material is mainly composed of kaolin, talc, α-alumina, high-alumina alumina with a specific content, high-alumina alumina with a particle size of not more than 0.5mm, and a particle size of not more than 0.5 mm. It is prepared from burnt gemstones larger than 1mm and burnt gemstones with a particle size of 1-2mm; the fabric is mainly composed of alumina with a particle size of not more than 0.7μm, α-alumina with a particle size of not more than 46.9μm, grains Zirconium silicate with a particle size not greater than 46.9 μm, zirconium silicate with a particle size not greater than 1 mm and cordierite with a particle size of 0.5-1.25 mm. The above-mentioned corrosion-resistant sagger 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 cobalt oxide and ternary lithium batteries are currently widely used cathode materials for lithium batteries in China, and most of the cathode materials are produced by high-temperature solid-phase synthesis in a refractory kiln. During the synthesis process, The sagger materials for burning are generally cordierite, mullite, quartz and corundum. Among these materials, cordierite composite mullite saggers are the most widely used. This type of sagger is made of cordierite, mullite, and corundum as raw materials, added with some clay and micropowder as binder, and molded under a high-tonnage press. After regular temperature curing, it is put into a refractory kiln for high temperature firing The product is made. In addition, the average consumption of saggers at hom...

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