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Introduction to the crystal structure of zirconia ceramics

Introduction to the crystal structure of zirconia ceramics

Zirconia ceramics and materials containing zirconia ceramics are widely used. Due to the excellent physical and chemical properties of zirconia, it has a prominent position in engineering ceramics and advanced ceramics, such as industrial ceramic rods, ceramic plungers, and ceramic shafts. Wait.

Due to its high melting point and chemical inertness, pure zirconia can be used as a refractory material, however, the transformation from tetragonal to monoclinic during thermal cycling can cause severe bulk cracking of the material. Many applications of zirconia therefore require it to be alloyed with alkaline earth oxides or rare earth oxides to give it a fully or partially stable structure. At present, the alloying elements added to zirconia ceramic materials are mainly Ca, Mg, Ce and Y oxides.

There are three stable allotropes of zirconia: monoclinic, cubic and tetragonal. The monoclinic phase of pure zirconia is stable from room temperature to 1170°C, above this temperature it transforms into the tetragonal phase, and then transforms into the cubic phase at 2370°C until melting occurs at 2680°C. There is a hysteresis phenomenon in the transition from monoclinic phase to tetragonal phase. All rare earth elements can form solid solutions with zirconia, and yttrium-stabilized zirconia is currently the most widely used. Pintejin Ceramics is a comprehensive enterprise focusing on the research and development, sintering, molding and machining of zirconia ceramic semi-finished products;

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