Three different sintering stages of zirconia ceramics
Pre-sintering of Zirconia ceramics: At this stage the temperature control is very important, and the temperature continues to rise so that zirconia ceramic embryos will shrink. In the density and intensity of the basic will not change, if the microscopic observation, in fact, the size of the grain will be changed, and this stage of zirconia ceramic embryo is the most prone to cracking. Because the moisture in the embryo and the binder is discharged, so the phenomenon of cracking will be relatively large, then the temperature control is particularly important.
Zirconia ceramic sintering: In the sintering process, the temperature will occur relatively small amplitude of change, and zirconia ceramic embryos will continue to shrink. The density of the changes will be relatively large, in the micro-grain observation, the change will not be particularly obvious, particles and particles will not be bonded between the phenomenon, the pores will become smaller. Because of the large changes in the volume of the embryos of zirconia ceramics, there is always the phenomenon of cracking and deformation.
After sintering of Zirconia ceramics: In the final sintering process, the temperature change is the largest, and the change between the density and the embryo is very obvious. Whether it is microscopic or direct observation, the grain will occur a larger change, the pores become smaller and small, will directly form more individual pores, so there will be more pores directly adhesion in the grains above.