A kind of preparation method of anti-oxidation silicon carbide kiln furniture

Abstract

The invention belongs to the field of refractory materials, and in particular relates to an anti-oxidation silicon carbide kiln furniture and a preparation method. The preparation method of the anti-oxidation silicon carbide kiln furniture is to press a layer of anti-oxidation material on the surface of the traditional silicon carbide kiln furniture body. The anti-oxidation material is composed of 50-80 parts of metal silicon powder, 10-30 parts of zircon Composed of stone powder and 10‑20 parts of fused silica powder. The anti-oxidation silicon carbide kiln furniture prepared by the invention has the performance advantages of strong oxidation resistance, anti-oxidation material on the surface layer and the silicon carbide substrate are not easy to crack, and the silicon carbide kiln furniture has long service life.

Description

technical field [0001] The invention belongs to the technical field of refractory materials, and in particular relates to a preparation method of oxidation-resistant silicon carbide kiln furniture. [0002] technical background [0003] Silicon carbide material has excellent high-temperature mechanical properties and is an important kiln furniture material. It is widely used in high-temperature ceramics, refractory materials, non-ferrous metallurgy and other industries; but when silicon carbide kiln furniture products are used at high temperatures for a long time, silicon carbide is easy to be Oxidation produces silica glass phase or low-melting silicate substances, which lead to expansion, deformation and surface peeling of silicon carbide kiln furniture, which will reduce the strength, thermal shock resistance and service life of kiln furniture. The oxidation resistance of kiln furniture products has become the focus of research in the silicon carbide kiln furniture industr...

AI Technical Summary

Problems solved by technology

[0003] Silicon carbide material has excellent high-temperature mechanical properties and is an important kiln furniture material. It is widely used in high-temperature ceramics, refractory materials, non-ferrous metallurgy and other industries; but when silicon carbide kiln furniture products are used at high temperatures for a long time, silicon carbide is easy to be Oxidation produces silica glass phase or low-melting silicate substances, which lead to expansion, deformation and surface peeling of silicon carbide kiln furniture, which will reduce the strength, thermal shock resistance and service life of kiln furniture. The oxidation resistance of kiln furniture products has become the focus of research in the silicon carbide kiln furniture industry

[0004] There have been many reports on the research on the oxidation resistance of silicon carbide materials; the invention patent "Preparation method of silicon carbide ceramic kiln furniture coated with yttrium-stabilized zirconia coating (application number 201510762902.3)" coated with yttrium-stabilized zirconia sol Covering the surface of silicon carbide ceramic kiln furniture, and then firing together, a yttrium-stabilized zirconia coating is formed on the surface of silicon carbide ceramic kiln furniture; the thermal stability of the zirconia coating is very good, but the use of Zirconium sol forms a coating during the firing process. On the one hand, the large shrinkage of the coating during sintering will cause the coating to crack and fall off. On the other hand, it is difficult for zirconium dioxide to be combined with silicon carbide materials. The difference in the coefficient will also affect the combination and use effect of the coating; the invention patent "An anti-oxidation white coating material on the surface of silicon carbide and its preparation method" (application number 201811477839.9) mixes dilight aluminum phosphate and zircon powder in the Make a slurry together, and apply it on the surface of silicon carbide by brushing or scraping to prepare a silicon carbide anti-oxidation white coating material. Theoretically speaking, the thermal expansion coefficient of silicon carbide and zircon powder is close to that of Coating cracking caused by thermal expansion coefficient mismatch

However, the fired silicon carbide product has a high density and is not easy to penetrate and bond with other oxide materials. Therefore, it is difficult to make the two closely bonded by brushing the coating on the surface of the product. The oxidation resistance and service life of the coating It is not too ideal, and the cracking and peeling of the coating is inevitable; therefore, the development of anti-oxidation silicon carbide kiln furniture materials that are not easy to crack and have a long service life has high application value