The varieties of ceramic fiber mainly include ordinary aluminum silicate fiber, high aluminum silicate fiber, aluminum silicate fiber containing zirconium, polycrystalline alumina fiber and polycrystalline mullite fiber. In recent years, foreign countries have successfully developed (or are developing) some new ceramic fiber varieties, such as magnesium olivine fiber, ceramic fiber (SiO Cao MgO system and Al, o-cao, etc.), ceramic fiber cotton, felt, blanket, module, paper, cloth, belt, rope, etc

The quartz fiber produced by furnace method is a kind of ceramic fiber with excellent performance. However, due to its high price, it is generally not used as thermal insulation material. Coating Si and Al on the quartz fiber can further improve its thermal insulation performance. The used quartz fiber products can also be recycled. The method is to crush the waste quartz fiber thermal insulation products, mix them with water and binder, and then form high-temperature thermal insulation products. High silica fiber is also a kind of ceramic fiber with excellent properties. It is a glass fiber with high SiO content prepared from ordinary alkaline silicate fiber after acid treatment and heat treatment. Its long-term service temperature is above 1000 ℃. NASA uses it as the thermal insulation material for aerospace vehicles. Ceramic fibers such as alo, fiber, polycrystalline mullite fiber and ZrO fiber can be produced by sol-gel method. In recent years, a kind of al203-y203 fiber has been successfully developed by sol-gel method, In this kind of fiber, the content of alo is generally 14.7%~54.3%, and the content of Yo is generally 45.7%~85.4%. This kind of al203-y203 fiber has the advantages of high temperature resistance, high temperature strength and high temperature creep resistance. In addition to being used as high temperature insulation material, it can also be used as reinforcement of high temperature filter material and high temperature structural material.