Refractory material is a material with good refractory properties at high temperature, which is widely used in metallurgy, chemical industry, building materials, electric power and other high-temperature industrial fields. There are many types of refractories, and classification by shape is a common way to classify them.
According to the classification of shape, refractories can be divided into two categories: shaped refractories and unshaped refractories. Shaped refractories include refractory bricks, refractory concrete and laminate, etc., whose shape and size are fixed, and need to be cut and processed according to the needs when used. Amorphous refractory materials include refractory castables, refractory plastics, refractory ramming materials, etc., which can be mixed, stirred, poured and other operations according to a certain proportion and construction method, and directly used to construct refractory structures of various shapes and sizes.
There are great differences in composition, structure, and performance of different refractory materials. According to its chemical properties, it can be divided into acid refractories, neutral refractories and alkaline refractories. According to its mineral composition, it can be divided into refractories of different materials such as siliceous, aluminum silicate, corundum, mullite, etc. In addition, there are some special types of refractories, such as thermal insulation refractories, fused silica refractories, etc.
The fields of application of different refractories are also different. For example, siliceous refractories have a high load softening temperature and good high-temperature performance, which is suitable for high-temperature kilns and thermal equipment. Clay refractories have good wear resistance and impact resistance, and are suitable for furnace lining and amorphous refractory materials. Corundum refractories have high melting point and hardness, and are suitable for parts such as corrosive substances and furnace tubes; Mullite refractories have a low coefficient of expansion and good thermal shock stability, and are suitable for lining and components of high-temperature industrial furnaces.
In addition, there are differences in the construction methods of different refractory materials. For example, refractory castables need to be poured and vibrated within a specified time to remove air bubbles and improve their density and strength; Refractory plastics, on the other hand, need to go through processes such as stirring, kneading and plasticizing to make them plastic, and then apply them by coating or extrusion.
In short, refractories classified by shape have many different types and application fields, and there are great differences in composition, structure, and performance of different refractories. Understanding the properties and application fields of different refractories, and correctly selecting and using refractory materials are of great significance to ensure the normal operation and prolong the service life of high-temperature industrial equipment.