Zirconia ceramics have excellent properties such as high melting point and boiling point, high hardness, good toughness, good wear resistance, insulators at room temperature, and electrical conductivity at high temperatures, so they are widely used in structural ceramics and functional ceramics. , then what is the sintering process of zirconia ceramics?
- Before sintering zirconia ceramics: temperature control is very important in this stage. If the temperature continues to rise, the embryo of zirconia ceramics will shrink.
There is basically no change in density and strength. If you observe it from the microscopic perspective, the grain size will change, and the embryo of zirconia ceramics is most prone to cracking at this stage.
- Because the water and binder in the embryo are discharged, the cracking phenomenon will be relatively large, so the temperature control is particularly important.
During sintering of zirconia ceramics: during the whole process of sintering, the temperature will change slightly, and the embryo of zirconia ceramics will continue to shrink.
- The change of density will be relatively large. If you observe the grains in the microscopic view, the change will not be particularly obvious. There will be no bonding between particles, and the pores will become smaller and smaller.
Because the embryonic body of zirconia ceramics has changed greatly in volume, cracking and deformation always occur.
- After sintering of zirconia ceramics: in the final sintering process, the temperature change is the largest, and the change between density and embryo is also obvious.
No matter from the microscopic or direct observation, the grains will change greatly, the pores will become smaller and smaller, and more single pores will be directly formed, so more pores will directly adhere to the grains.