Introduction to the Sintering Method of Zirconia Ceramics
The technical method of densifying granular ceramic bodies and forming solid materials using zirconia ceramics is called sintering. Zirconia ceramic sintering is a method of removing voids between particles in the green body, removing a small amount of gas and impurities, and combining with each other to form new substances.
The heating device used for firing zirconia ceramics 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 of zirconia ceramics 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 of zirconia ceramics 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 complex shaped products.
Due to the uniform structure of zirconia ceramics, the material performance is improved by 30-50% compared to cold pressing sintering. Improved by 10-15% compared to conventional hot press sintering. Therefore, some high value-added alumina ceramic products or special parts and components required by national defense and military industry, such as ceramic bearings, mirrors, nuclear fuel, gun barrels and other products, are fired by Hot isostatic pressing.
In addition, the microwave sintering method, arc plasma sintering method, and self propagating sintering technology of zirconia ceramics are also under development and research.
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