1. Powder preparation and production requirements for zirconia ceramics: < br />
There are many methods for preparing powders with high purity, good dispersion properties, ultra-fine particles and narrow particle size distribution. The purification of zirconia mainly includes chlorination and thermal decomposition methods, alkali metal oxidative decomposition methods, and lime fusion. method, plasma arc method, precipitation method, colloid method, hydrolysis method, spray pyrolysis method, etc. Powder processing methods include co-precipitation method, sol-gel method, evaporation method, supercritical synthesis method, microemulsion method, hydrothermal synthesis method, and vapor deposition method.
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2. Slurry casting process of zirconia ceramics:
The molding process of zirconia ceramic slip casting includes: physical dehydration process and chemical condensation process! Physical dehydration removes moisture from 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 improves the slurry. The ionic strength in the slurry causes flocculation of the slurry. Under the action of physical dehydration and chemical coagulation, ceramic powder particles are deposited on the plaster mold wall. Slip injection molding is suitable for preparing large ceramic parts with complex shapes, but the quality of the green body, including shape, density, strength, etc., is poor, the labor intensity is high for workers, and it is not suitable for automated operations.
