The types and characteristics of alumina ceramics and the development trend of ceramics

Alumina ceramic is the modern industry, cost-effective ceramic parts, and better than the original metal parts performance, the future development may be more inclined to use ceramic materials parts.

Alumina ceramics are divided into 99 porcelain, 95 porcelain, 90 porcelain, 85 porcelain and other types according to the Al2O3 composition. Sometimes, the Al2O3 composition is also classified as a general alumina ceramic series products in 80 or 75. 99 alumina porcelain materials are used to make high temperature tongs, fireproof furnace bodies and unique metal composite materials, such as ceramic bearings, ceramic seals and water valves. Alumina porcelain is mainly used for corrosion and wear resistant parts. 85 porcelain is often mixed with some talc, which enhances it electrical properties and mechanical strength. It can be sealed with molybdenum, niobium, tantalum and other metals. Some are used as electric vacuum devices.

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Alumina ceramic raw materials because of their physical and electrical properties, and low production cost, so it is currently used as a kind of structural ceramics. The tensile strength of 700-1000mpa and Weber displacement coefficient of 40 can be obtained by using high purity submicron aluminum oxide ultrafine powders. However, the fracture toughness of alumina ceramic materials is very low, usually only 3-4 mpa. Therefore, improving the fracture toughness of alumina ceramics has been a period of ceramic material scientists

Hope and strive for the goal.

Industrial aluminum hydroxide powder was used as the initial raw material. The average particle size of the powder was 2.8μm. The powder contains about 1 mass of impurities, mainly Si02, Na20 and Mg0. The introduction of A-AL2O 3 crystal seed is to add the initial raw material alumina powder into the ball milling tank, which has a high content of alumina powder. In the process of ball milling, the grinding chips from the high purity alumina grinding ball, namely A-A1203 crystal seed, are introduced into the alumina powder. The alumina powder after ball milling is put in the oven for drying. Weight change of alumina mill before and after ball milling

Aluminum oxide is a perfect engineering project porcelain, it shows the dielectric strength of electrical equipment, with high toughness and wear resistance but relatively low compressive strength and impact toughness.