Uses and development of refractories.

Refractory materials are inorganic non-metallic materials with a fire resistance of not less than 1580 "C.
National regulations have different definitions, such as those officially published by the International Organization for Standardization (ISO)
The international standard stipulates that "four refractory materials are non-metallic materials with a fire resistance of at least 1500 ° C or
Products (but not excluding those containing a certain percentage of metal) ", but refractory is used as.Structural materials of high-temperature kiln, furnace and other thermal equipment, as well as industrial high-temperature containers and components Materials and can withstand corresponding physical and chemical changes and mechanical effects.
 
Most refractory materials are made of natural ores (such as refractory clay, silica, magnesite, white
Marble, etc.) are made from raw materials. Today, certain industrial and synthetic raw materials (such as
Industrial alumina, silicon carbide, synthetic mullite, synthetic spinel, etc.) are also increasing.
According to the refractory degree, it can be divided into ordinary refractory products (1580-1770C), advanced refractory products (1770-2000 ° C) and special refractory products (above 2000 ° C).
 
According to the shape and size, it can be divided into standard type bricks, special type bricks, special type bricks, large special type bricks, and special products such as crucibles, dishes and tubes for laboratory and industry. According to the manufacturing process, it can be divided into slurry casting products, plastic molding products, semi-dry pressing products, tamping molding products from powdery non-plastic clay, products pouring from molten materials, and products sawn from rocks.