is a ceramic material made from alumina by high-temperature calcination. Its main component is -Al2O3
1. Raw material preparation: The main raw material of calcined alumina is industrial alumina powder. The particle size and purity of industrial alumina powder have a great influence on its performance, so the raw materials need to be strictly screened and processed.
2. Mixing and ball milling: The screened alumina powder is mixed evenly with a certain amount of binder, and then ball milled by a ball mill to form a uniform granular material.
3. Molding and drying: The ball-milled material is placed in a special die-casting machine for pressing and molding to obtain the required shape and size, and then the molded body is placed in a drying chamber for drying. It usually takes several days to reduce the moisture content to less than 1%.
4. Sintering: The dried body is placed in a high-temperature furnace for sintering, usually at a temperature between 1500-1700 degree . During the sintering process, the organic matter and impurities in the body will gradually volatilize and crystallize, and finally form a dense calcined alumina ceramic material.
1. High melting point and high thermal stability: The melting point of calcined alumina is as high as 2000-2600 degree , which is much higher than most metal and non-metal materials. Due to its high melting point, it can still maintain high strength and stability at high temperatures.
2. Excellent wear resistance: calcined alumina has extremely high hardness, usually above Mohs hardness 9, which makes it an ideal abrasive material and is widely used in various wear fields.
3. Good electrical insulation: calcined alumina has good dielectric properties and resistivity, and can be used to make electronic components such as capacitors and insulators.
4. Wide range of application fields: calcined alumina has broad application prospects in the fields of ceramics, abrasives, electronic materials, etc., and can be used to manufacture high-temperature furnace tubes, ceramic bearings, grinding tools and other products.
1. Ceramic field: Calcined alumina, as one of the main components of ceramic materials, is widely used in various ceramic products, such as refractory bricks, ceramic tubes, ceramic knives, etc. It can also be compounded with other materials to prepare ceramic composite materials with special properties.
2. Abrasive field: Calcined alumina has extremely high hardness and wear resistance, and is an ideal material for making abrasives. At present, many manufacturers have produced calcined alumina abrasive products of various specifications, such as grinding wheels, cutting discs, etc.
3. Electronic materials field: Calcined alumina has good electrical insulation and dielectric properties, and can be used to make various electronic components, such as capacitors, insulators, resistors and other products. It can also be used as a transparent electrode material in solar cells and other fields.
Calcined alumina, as a high-performance ceramic material, has broad application prospects. With the development of science and technology and people's increasing demand for new materials, it is believed that there will be a broader application market in the future.
