High-temperature resistant materials include refractory materials and heat-resistant materials, including inorganic compounds and polymer materials. Refractory materials generally refer to inorganic materials that can withstand temperatures above 1580°C. They are used to build kilns, combustion chambers and other building materials that need to withstand high temperatures. It is generally made of quartz sand, clay, magnesite, dolomite, etc. as raw materials, such as refractory cement and magnesia bricks. Broadly speaking, inorganic refractory and heat-resistant materials refer to these compounds that have high hardness, good brittleness, and good chemical resistance, and their melting point is above 1500. Mainly divided into two types: metal and non-metal compounds and non-metal compounds.
The former such as tungsten, molybdenum, tantalum, niobium, vanadium, chromium, titanium, zirconium and other refractory metals and rare earth metals such as borides, carbides, nitrides, silicides, phosphides and sulfides; the latter such as boron carbide, Silicon carbide, boron nitride, silicon nitride, boron phosphide, silicon phosphide, etc. The latter has extremely important uses, and can be used as high-temperature refractory materials (such as abrasives, molds, nozzles, high-temperature thermowells), heat-resistant materials (such as rocket structural components, nuclear engineering materials, electric heating components), electrical materials ( Such as high temperature thermocouple, ignition electrode), in addition, it is also used as chemical resistant materials and hard materials.
Heat-resistant polymers can be used as high-temperature resistant film insulation materials, high-temperature resistant fibers, high-temperature resistant coatings, and high-temperature resistant adhesives. According to the time of high temperature resistance, it is divided into instant high temperature resistant materials and longer time high temperature resistant materials. The former can withstand several seconds to several minutes at 1000～10000℃. Among them, the ablation material is also a high temperature resistant material. For example, at 300～600℃, it can maintain its mechanical strength and chemical corrosion resistance in the air.