Introduction of New Forming Methods for Zirconia Ceramic Parts

Zirconia ceramic parts have diversity and complexity, so its molding method is very important. The following is a brief introduction of several main molding methods of zirconia ceramic parts by Kezhong Ceramic Factory.

1. Hot die casting

Hot die-casting molding is to mix ceramic powder with binder (paraffin) at high temperature (60~100℃) to obtain slurry for hot die-casting. The slurry is injected into a metal mold under the action of compressed air, cooled at constant pressure, and demoulded to obtain a wax blank. The wax blank is dewaxed under the protection of inert powder to obtain a green blank, and the green blank is sintered at high temperature to form a zirconia electronic ceramic structure. The green body formed by hot die casting has uniform size and internal structure, less die wear and high production efficiency, and is suitable for various raw materials.

2. Grouting molding

The forming process of slip casting includes physical dehydration process and chemical coagulation process. Physical dehydration removes the water in the slurry through the capillary action of porous gypsum mold. The chemical coagulation process is because Ca2+ generated by the dissolution of CaSO4 on the surface of gypsum mold improves the ionic strength in the slurry of zirconia ceramic structural parts, resulting in flocculation of the slurry. Under the action of physical zta dehydration and chemical coagulation, ceramic powder particles are deposited and formed on the gypsum mold wall. Grouting molding is suitable for preparing large-scale ceramic parts with complex shapes, but the quality of the blank, including shape, density and strength, is poor, and the labor intensity of workers is high, so it is not suitable for automatic operation.

3. Tape casting

Tape casting is to fully mix ceramic powder with a large number of organic binders, plasticizers, dispersants, etc. to obtain flowable viscous slurry. The slurry is added to the hopper of the tape casting machine, the thickness is controlled by a scraper, and it flows out to the conveyor belt through the feeding nozzle, and the film blank is obtained after drying. This process is suitable for preparing thin film materials. In order to obtain better flexibility, a large amount of organic matter is added, which requires strict control of process parameters. Otherwise, it is easy to cause defects such as peeling, streaking, low film strength or difficult peeling of zirconia ceramic structures.

Among them, the forming processes of zirconia ceramic perforated structural parts include dry pressing, isostatic pressing, injection molding, plastic extrusion molding, colloidal solidification molding, etc., which will not be explained here. From the process of the products, it can be seen that its excellent quality is undeniable.

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