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Introduction and classification of refractory materials

wallpapers Industry 2020-12-30
Refractory materials refer to inorganic non-metallic materials with a refractoriness not less than 1580°C. They are used as structural materials for high-temperature furnaces and other thermal equipment, as well as materials for industrial high-temperature containers and parts, and can withstand corresponding physical and chemical changes. And mechanical action.
 
Refractories are high-temperature structural materials made by processing natural ores (such as bauxite, silica, magnesite and dolomite). In addition to natural raw materials, refractories made from certain industrial raw materials and synthetic mullite, spinel, silicon carbide and other raw materials are also increasing. Refractory materials used to smelt pure metals or special alloys and manufacture oxides and refractory compounds have also been greatly developed in high-temperature technology. These refractory materials constitute various and complex refractory systems. Different refractories have different compositions, preparation processes, structural features and performance. Refractories of the same composition can also have different preparation processes and appearance shapes. Therefore, in order to facilitate research and reasonable use, it is necessary to scientifically classify refractory materials. According to different viewpoints, there are many classification methods.
 
1. According to composition
 
It can be divided into siliceous products, aluminum silicate products, magnesium products, dolomite (high-quality) products, chromium products, carbon products, zirconium products, pure oxide products and impure oxide products. This classification method can characterize the basic composition and characteristics of various materials, and has practical significance in production, use and scientific research.
 
2. According to the processing method
 
Can be divided into slurry casting products, plastic molding products, semi-dry press molding products, powder non-plastic tamping molding products, products poured from molten materials, products molded by injection or wire drawing, and natural products sawed from rock products Materials, etc. This classification method intuitively shows the technical characteristics of refractory products.
 
3. According to the refractoriness
 
It can be divided into ordinary refractory products with a refractoriness of 15801770℃. High-grade refractory products with a refractoriness of 17702000℃; special-grade refractory products with a refractoriness above 2000℃. This classification method shows the high temperature performance of refractory materials.
4. According to the shape of the refractory
 
It can be divided into shaped refractory products, such as fired bricks, fused bricks (fused-cast bricks), refractory insulation bricks, and special products, such as experimental and industrial crucibles and utensils; non-shaped refractory materials in the use place are called bulk materials , Is made into the required shape and undergoes heat treatment, such as castables, ramming materials, protruding materials, injection materials, refractory mud, etc.; refractory fibers such as aluminum fiber, aluminum silicate fiber, etc. are usually processed into carpet. , Felt, wood board, rope, component and fiber block products. This classification method intuitively reflects the shape of refractory materials.

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