China Alumina Ceramic Lining Tiles
The main crystalline phase of alumina ceramics is corundum. Corundum (a crystal form of alumina) is a material with excellent mechanical properties, insulating properties, etc. The higher the alumina content in the alumina ceramic, the better its performance. The alumina ceramics are usually divided by the content of alumina, like 99 porcelain, 97 porcelain, 95 porcelain, the number represents the approximate content of alumina in the raw material, 99 porcelain is better than 95 porcelain.
Alumina ceramics are classified into two types: high purity type and normal type.
The high-purity alumina ceramics have a Al2O3 content of 99.9% or more. Since the sintering temperature is as high as 1650-1990 ° C and the transmission wavelength is 1 to 6 μm, the molten glass is generally used to replace the platinum crucible; Sexual and alkali-resistant metal corrosion is used as a sodium lamp; it can be used as an integrated circuit substrate and high-frequency insulation material in the electronics industry.
Ordinary alumina ceramics are classified into 99 porcelain, 95 porcelain, 90 porcelain, 85 porcelain, etc. according to the Al2O3 content. Sometimes the Al2O3 content is 80% or 75%, which is also classified as ordinary alumina ceramic series. Among them, 99 alumina ceramic materials are used to make high temperature crucibles, refractory furnace tubes and special wear-resistant materials, such as ceramic bearings, ceramic seals and water valve sheets; 95 alumina ceramics are mainly used as corrosion-resistant and wear-resistant parts; In addition, due to the incorporation of part of talc, the electrical properties and mechanical strength are improved, and it can be sealed with metals such as molybdenum, niobium and tantalum, and some are used as electric vacuum device devices.
As the most widely used material in advanced ceramics, alumina ceramics has the following development trends along with the development of the whole industry: (1) The level of technical equipment will increase rapidly: The development of computer technology and digital control technology has promoted the advanced ceramic materials industry. Technological advancement and rapid development, such as automatic control of continuous sintering kiln, high-power large-capacity grinding equipment, high-performance powder granulation equipment and other advanced pressure forming equipment, and other advanced equipment to promote the overall level of the industry, while In terms of production efficiency and product quality, it has also been significantly improved; (2) The product quality level has been continuously improved: domestic microcrystalline alumina ceramic products have grown from scratch, the scale of the industry has grown from small to large, and the quality of products has gone from low to high. A rapid development process; (3) The scale of the industry will expand rapidly: Microcrystalline alumina ceramic products as the basic materials of other industries or fields are affected and restricted by the development level of other industries. From the application of alumina ceramics, the application range is wider and wider, and the dosage is getting larger and larger, especially in the production of anti-wear engineering and building ceramics.