Sintering Technology of Zirconia Ceramics

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Sintering Technology of Zirconia Ceramics

The technical method of densifying granular ceramic bodies and forming solid materials is called sintering. Sintering refers to the method of removing voids between particles in the green body, removing small amounts of gas and impurities organic matter, and allowing particles to grow and combine with each other to form new substances.

The heating device used for firing is the most widely used electric furnace. In addition to pressureless sintering, there are also hot pressing sintering and Hot isostatic pressing sintering. Although continuous hot pressing sintering increases production, the equipment and mold costs are too high. In addition, due to axial heating, the length of the product is limited.

The Hot isostatic pressing sintering uses high temperature and high pressure gas as the pressure transmission medium, which has the advantage of uniform heating in all directions, and is very suitable for the sintering of products with complex shapes.

Due to its uniform structure, the material performance is improved by 30-50% compared to cold pressing sintering. Improved by 10-15% compared to conventional hot pressing sintering.

At present, some high value-added zirconia ceramic products or special parts needed, such as ceramic bearings, mirrors, nuclear fuel, gun barrels and other products, are fired by Hot isostatic pressing.

In addition, microwave sintering, arc plasma sintering, and self propagating sintering technologies are also being developed and studied.

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