Alumina ceramic a wide use in industrial production, alumina ceramics is of high hardness and density, the hardness of 9, slightly lower than that of diamond, bulk density is generally greater than 3.5 g/cm3, some can be up to 4.0 g/cm3. Alumina ceramics by Al2O3 content is divided into 99 porcelain, 95 porcelain, 90 porcelain, 85 porcelain, and other varieties, of which 99 alumina ceramics material used to make high temperature crucible, furnace pipe and special wear-resistant materials, such as ceramic bearings, seals, etc.; Alumina ceramics is mainly used as corrosion resistant and wear resistant parts.
Alumina ceramic is widely used in coal-fired power plants, steel, smelting, machinery, coal, mining, chemical, cement, port terminals, and other enterprises of coal transporting system, pulverizing system, ash discharge and dust removal system all wear large mechanical equipment, can according to the different requirements for different types of products.
High temperature resistance, corrosion resistance, high insulation, 95, 99 alumina ceramics, are widely used in lamps and lanterns, electronics, petroleum, textile and other industries, high purity alumina ceramics, ultrafine powder is prepared a high strength of ceramic industry. Wet grinding, polyurethane material and rubber material for water, alcohol, organic solvent products; In the process of slow drying, alumina ceramic is used to spray and blow alternately in the direction of the billet in a certain temperature and humidity. In this way, it can effectively eliminate the occurrence of uneven phenomena in the drying process of ceramic products, thus obtaining high quality alumina ceramic products.
Alumina ceramic products have many methods such as dry pressure, grouting, extrusion, cold and static pressure, injection, flow delay, heat pressure and heat, etc. In recent years, pressure filtration molding, direct solidification injection molding, gel injection molding, centrifugal grouting forming and solid free forming technology have been developed. Different product shapes, sizes, complex shapes and precision products require different molding methods.
In the process of slow drying, alumina ceramic is used to spray and blow alternately in the direction of the billet in a certain temperature and humidity. In this way, it can effectively eliminate the occurrence of uneven phenomena in the drying process of ceramic products, thus obtaining high quality alumina ceramic products.
Alumina ceramics can also be divided into electronic ceramics, pottery and wear-resistant ceramic lighting (also known as alumina ceramic) : talc porcelain, nation-level porcelain, world-level.22 porcelain, the ninth porcelain, 96 porcelain, porcelain, porcelain with high purity; Substrate, the substrate can be made up, porcelain, porcelain, ceramic ring, ceramic ring, ceramic rods, ceramic eye, socket, circuit shell, spark plug valves, insulation sleeve, wear-resisting, wear-resisting machinery rotor core, car circuit wiring insulation ceramic everywhere, and so on.
Ordinary alumina ceramics are divided into 99 porcelain, 95 porcelain, 90 porcelain and 85 porcelain in accordance with Al2O3 content. Sometimes the content of Al2O3 is in 80% or 75% of the ceramic series. Among them, 99 alumina ceramic materials are used to make high temperature crucible, furnace tube and special wear-resisting material such as ceramic bearing, ceramic seal and water valve, etc. Alumina porcelain is mainly used as corrosion resistant and wear-resisting parts; In China, due to the constant incorporation of the sliding stone, the electrical performance and mechanical strength can be improved with metal sealing, such as molybdenum, niobium and tantalum, and some used as vacuum devices.