Alumina ceramic special-shaped parts
Aluminum oxide ceramics, silicon nitride ceramics, zirconia ceramics
As far as products are concerned, alumina ceramics have excellent dielectric strength, low high-frequency loss but good high-frequency dielectric strength, and secondly, alumina ceramic raw materials have temperature resistance, small linear expansion coefficient, and shock resistance. High toughness and good thermal conductivity. In addition, alumina ceramics have the characteristics of chemical corrosion resistance and molten metal resistance. It is not known that alumina ceramics are flame-retardant and stainless steel is strong and not easy to be destroyed. There are other materials and metal composite materials that cannot be compared. good features.
The molding methods of alumina ceramic structural parts include dry pressing, grouting, injection, hot casting and other methods.
1. Dry pressing molding: The dry pressing molding technology of alumina ceramic structural parts is suitable for structural parts with a wall thickness of more than 1mm. The press adopts hydraulic type and mechanical type, and the output can reach 15-50 pieces per minute.
2. Grouting molding method: Grouting molding is the earliest molding method used for alumina ceramic structural parts. Due to the use of plaster molds, the cost is low and it is easy to form large-sized and complex-shaped parts. Usually, water is used as the flux medium, and the debonding agent and binder are added, exhausted after fully grinding, and then poured into the plaster mold. Due to the adsorption of moisture by the capillary of the gypsum mold, the slurry is solidified in the mold. During hollow grouting, when the mold wall absorbs the slurry to the required thickness, the excess slurry needs to be poured out. In order to reduce the shrinkage of the green body, high-concentration slurry should be used as much as possible. The technical method of densifying the granular ceramic body and forming a solid material is called sintering. Sintering is a method to eliminate the voids between particles in the green body, remove a small amount of gas and impurity organic matter, and make the particles grow and combine with each other to form new substances.
The heating device used by our company for firing is an electric furnace. After the alumina ceramic structural parts are sintered, they generally need to be finished. Due to the high hardness of alumina ceramic structural parts, it needs to be finished with harder grinding and polishing brick materials.