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Sintering process and common problems of zirconia ceramics

Number of visits: Date:2019-04-29 08:44
It is generally carried out in a conventional electric furnace by a conventional heating method, and is currently the most commonly used sintering method in the production of ceramic materials. Since pure ceramic materials are sometimes difficult to sinter, some sintering aids are usually introduced to promote the rearrangement and viscous flow of the particles, thereby obtaining a dense product and also lowering the sintering temperature. The hot press sintering adopts a special hot press, and the single-phase or two-phase pressure is applied at a high temperature, and the microstructure is anisotropic after the pressure sintering, which results in an anisotropic use property and limits the range of use thereof. Microwave heating differs from the conventional heating mode in that it utilizes the dielectric loss of the ceramic material in the microwave electromagnetic field to bring the material to the sintering temperature to achieve sintering and densification of the ceramic. Sintering is the last process of forming ceramic blanks. The performance of ceramic products is largely determined by sintering.
The zirconia ceramic is deformed during the sintering process, which may be due to the excessive distribution of the powder particle size; the selection and addition of additives in the powder are unreasonable; the shrinkage of the ceramic is inconsistent. The main reason for the cracking of the sintered ceramic body is that there are defects inside the ceramic body, and it is also related to the shrinkage of the green body. The reason for the inconsistent shrinkage of the green body is analyzed by the cause of the sintering deformation. When the grain grows abnormally, it will make it difficult for the ceramic material to reach a higher density, and many properties of the material deteriorate, especially the mechanical properties (fracture toughness, flexural strength, etc.).

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