Forming process of zirconia ceramic structural parts

Forming process of zirconia ceramic structural parts:

The forming process of zirconia ceramic structural parts includes hot die casting, grouting and casting. Here the manufacturer will explain the details for you:

1. Hot die casting

Hot die casting is to mix the ceramic powder and binder (paraffin) at a high temperature (60~100℃) to obtain the slurry for hot die casting, the slurry is injected into the metal mold under the action of compressed air, pressure maintaining cooling, demolding to get the wax billet, the wax billet is dewaxed under the protection of inert powder to get the plain billet, the plain billet is then sintered into zirconia ceramic structural parts at high temperature. The size of the hot die casting is accurate, the internal structure is uniform, the die wear is small, the production efficiency is high, suitable for all kinds of raw materials.

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2. Grouting molding

The molding process of grouting molding includes physical dehydration process and chemical condensation process. Physical dehydration removes water in the slurry through the capillary action of the porous plaster mold. The chemical condensation process is because the Ca2+ generated by the dissolution of CaSO4 on the surface of the plaster mold improves the ionic strength of the slurry of the zirconia ceramic structural parts, resulting in the flocculation of the slurry. Under the action of physical dehydration and chemical condensation, ceramic powder particles are deposited on the plaster mold wall. Grouting is suitable for the preparation of large ceramic parts with complex shape, but the quality of the blank body, including shape, density, strength, etc., is poor, the labor intensity of workers is high and not suitable for automatic operation.

3. Casting molding

Casting molding is to mix ceramic powder with a large amount of organic binder, plasticizer, dispersant, etc., to get a flowing thick slurry, which is added to the hopper of the casting machine, the thickness is controlled by the scraper, and the slurry flows out to the conveyor belt through the feeding nozzle. After drying, the film billet is obtained. This process is suitable for the preparation of thin film materials, in order to obtain better flexibility and add a lot of organic matter, it is required to strictly control the process parameters, otherwise it is easy to cause the defects of zirconia ceramic structural parts peeling, streaking, film strength is low or not easy to peel.

Among them, the forming process of zirconia ceramic structural parts is also dry pressing forming, isostatic pressing forming, injection molding, plastic extrusion forming, colloidal solidification forming, etc., which is not explained here. It can be seen from the process of the product that its excellent quality is undeniable.