As we all know, through the production of alumina ceramic sintering process of the molded article, throughout the entire sintering process can be divided into three stages, each stage presents the characteristics it is different, which can analyze one by one.
Former ceramics sintered alumina belongs to the first stage, in the process temperature control is very important, as the temperature rises, the body will gradually shrink, but the changes in density and strength are not large. That alumina ceramic microstructure did not change in the grain size, the body is very easy to crack this stage.
The second stage is the beginning of sintering, and this time there has been a slight change in the temperature, and the volume shrinkage, density and other great changes occur. Although the grain size of the microstructure is still no significant change, but is no longer a point of contact between the particles coarse pore is also greatly reduced, due to the volume of the sintered body occurs and the emergence of contraction.
In the late sintering temperature rises, all the changes one step further than the last, and only changes in density and reaches maximum intensity after almost no change. And the significant changes in the microstructure grain size, porosity becomes smaller and not mutually Unicom, the formation of isolated pores, pore portion remaining in the grains. At this stage, the emergence of long grain Assembly adverse consequences, so this time the need to add an additive to inhibit grain growth.
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