Zirconium oxide ceramicsThe production requires the preparation of powders with high purity, good dispersion properties, ultra-fine particles and narrow particle size distribution, ultra-fine zirconia powder There are many preparation methods for zirconium oxide. The main purification methods of zirconium oxide include chlorination and thermal decomposition methods, alkali metal oxidative decomposition methods, lime fusion methods, plasma arc methods, precipitation methods, colloid methods, hydrolysis methods, spray pyrolysis methods, etc.
Zirconium oxide ceramic production process:
1. Grouting
The molding process of grouting molding includes a physical dehydration process and a chemical coagulation process. Physical dehydration removes moisture in the slurry through the capillary action of the porous gypsum mold. The chemical coagulation process is because The Ca2+ generated by the dissolution of CaSO4 on the surface of the gypsum mold increases the ionic strength in the slurry, causing flocculation of the slurry. Under the action of physical dehydration and chemical coagulation, ceramic powder particles are deposited on the plaster mold wall.
2. Hot die casting
Hot die casting is to mix ceramic powder and binder (paraffin) at a relatively high temperature (60~100℃) to obtain a slurry for hot die casting. The material is injected into the metal mold under the action of compressed air, cooled under pressure, and demoulded to obtain a wax blank. The wax blank is dewaxed under the protection of inert powder to obtain a blank, which is then sintered at high temperature to become porcelain. The green body formed by hot die casting has precise dimensions, uniform internal structure, less mold wear, high production efficiency, and is suitable for various raw materials.
3. Tape casting
Tape casting is the process of casting ceramic powderThe material is fully mixed with a large amount of organic binders, plasticizers, dispersants, etc. to obtain a flowable viscous slurry. Add the slurry to the hopper of the casting machine, control the thickness with a scraper, and flow out to the conveyor belt through the feeding nozzle. After drying, the film base is obtained.
