Silicon carbide coating and preparation method of sagger with silicon carbide coating

Abstract

The invention discloses a silicon carbide coating which comprises 15-30% of silicon carbide, 15-30% of aluminum oxide, 15-30% of zirconium oxide, 20-40% of an organic silicon resin, 10-20% of an organic metal salt, 1-15% of organic silicon flame retardant, 0.1-5% of isopropanol and 1-10% of deionized water. The invention discloses a preparation method of a sagger with the silicon carbide coating.The preparation method comprises the following steps: weighing the raw materials, putting the raw materials into a stirring machine, and performing stirring so as to obtain the silicon carbide coating; smearing the silicon carbide coating to the inner surface of a sagger blank, or uniformly smearing the silicon carbide coating to the inner surface of the sagger blank; naturally drying the sagger blank coated by the silicon carbide coating, and transferring the sagger into a drying chamber for drying; and putting the dried sagger blank coated by the silicon carbide coating into a high-temperature kiln, and performing sintering, so as to obtain the sagger. The silicon carbide coating and the sagger disclosed by the invention are high in stability, low in cost and good in wearing resistance,corrosion resistance, high temperature resistance and flame retardancy effect.

Description

technical field [0001] The invention relates to the technical field of coatings, more specifically, the invention relates to a method for preparing a silicon carbide coating and a sagger with the silicon carbide coating. 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 The sagger materials used for firing are generally cordierite, mullite, quartz and corundum. This type of sagger is made of cordierite, mullite, and corundum as raw materials, adding part of clay and fine powder as a binder, and is pressed and formed under a high-tonnage press. After curing at room temperature, it is then fired in a refractory kiln at high temperature. get the product. Moreover, the average index of domestic and foreign sagger consumption is...

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 saggar 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 lithium silicate and lithium aluminosilicate are formed. The expansion coefficient of the 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, which will affect the service life of the sagger