What are the three different sintering stages of alumina ceramics?

What are the three different sintering stages of alumina ceramics? Sintering is a main process of the entire alumina ceramics in the manufacturing, and many different changes will occur before and after sintering, the following Xiaobian will focus on the three different sintering stages of alumina ceramics:

First, before sintering, the temperature control at this stage is more important, because the temperature continues to rise, the embryo will also shrink, but the strength and density will not change much, if it is microscopic, the grain will not change in size, but the embryo at this stage is more prone to cracking phenomenon, Mainly because the binder and water are completely discharged, so we must pay attention to the speed of temperature rise.

Second, in the sintering process, the temperature will change relatively small amplitude, the embryo body gradually shrinks, and the density will change greatly. Although there is no obvious change in the microscopic grain, all the particles are basically no longer bonded, and the entire pores will become smaller and smaller. Similarly, because the embryo body has a change in volume, So it is still relatively easy to appear deformation and cracking phenomenon.

Third, finally, after sintering, the temperature will rise significantly, the embryo body and density will undergo relatively large changes, the change of grain in the micro is also more obvious, the pores will become smaller, the formation of many isolated pores, but there will be some pores directly residual on the grain.