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Characteristics and classification of special refractory brick

2022-06-17

Special refractory materials are a group of high-purity oxides, non-oxides, carbon and other single materials or various composite materials with a melting point above 1800 ° C as raw materials, which are produced by traditional production processes or special production processes, and the products have special properties. And new refractory brick for special purposes, also known as special refractory brick.

The concept of special refractory brick is developed on the basis of traditional ceramics, precision ceramics and ordinary refractory brick as well as functional refractory brick. Special refractory brick include a wide range of content, mainly high-melting oxides, high-melting non-oxides and composite compounds derived therefrom, cermets, high-temperature coatings, high-temperature fibers and their reinforcing materials. Among them, high melting point non-oxides are usually called refractory compounds, which also include carbides, nitrides, borides, silicides and sulfides.

In the aerospace, nuclear energy, metallurgy, electronics, chemical, building materials, transportation and other industries with increasingly demanding and special requirements for use, ordinary refractory materials can no longer meet the new requirements. Only with high temperature resistance, corrosion resistance, high temperature chemical and thermal stability Only special refractory materials with good properties can undertake such heavy tasks and meet the requirements of service conditions.

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Special refractory brick are expensive, but have many excellent properties, and are indispensable and irreplaceable products in many industrial sectors. Especially in many new technologies and new fields, replacing other products in many key parts can greatly improve the service life and significantly increase the economic benefits. There are many classification methods for special refractory materials, some are classified by production process, some are classified by product application, but the main classification method is still classified by the different properties of raw materials and products, which can be roughly divided into five aspects:

(1) High melting point oxide materials and their composite materials;

(2) Refractory compound materials (carbides, nitrides, borides, silicides, etc.) and their composite materials;

(3) Composite materials of high melting point oxides and refractory metals (cermets)

(4) High temperature amorphous materials and inorganic coatings;

(5)High temperature fibers and their reinforcing materials.


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