The selection of zirconia ceramic additives is one of the most important issues in zirconia Ceramic Injection Molding technology. Different zirconia ceramic molding methods require different additive properties. For example, injection molding requires degreasing, fluidity, peptization, strength, and shrinkage; extrusion requires plasticity, peptization, strength, and lubrication; cold isostatic pressing (rubber molding) requires lubrication, granulation, and strength; mechanical pressing requires lubrication. Granularity, strength, mold release, etc. At the same time, different adhesives should be used for different zirconia ceramic products.
The requirements for additives in zirconia ceramic injection molding technology are as follows:
Zirconia ceramic peptization
It is advisable to use as few additives as possible for various molding methods of zirconia ceramics, and debonding (peptizing) additives can be used, which is beneficial to reducing production cycle and product cost. In particular, it is beneficial to remove the binder from the zirconia ceramics in the future.
Zirconia ceramic fluidity
Zirconia ceramic injection molding requires fluidity under high pressure. The injection effect of resin-based binder is good, because when resin-based, zirconia ceramics should pay attention to maintaining viscosity and inject slowly.
Expansion and contraction of zirconia ceramics
Due to the large amount of binder used in injection molding of zirconia ceramics, the zirconia ceramic blanks shrink greatly, affecting dimensional accuracy and geometric shape, and easily forming pores. Therefore, paraffin and other materials with small expansion-shrinkage can be used as additives. Such substances have less expansion-shrinkage effect than non-crystalline substances such as rosin.