Degreasing, debinding and sintering of zirconia ceramics
Jul 20, 2021
Degreasing, debinding
In addition to the molding technology based on dry pressing, products formed by other processes must undergo degreasing and debinding before being sintered in the furnace, because other processes other than dry pressing will add a certain proportion of zirconium powder during molding. Plasticizers, these plasticizers must be removed after the product is molded, otherwise it will have a serious quality impact on the sintered product. Plasticizers are mainly composed of paraffin wax and other polymer materials. These materials are required to exhibit good plasticity and fluidity at a certain temperature, and certain toughness and strength at room temperature.
Sintering
The sintering methods available for zirconia ceramics usually include: ⑴pressureless sintering, ⑵hot pressing sintering and reactive hot pressing sintering, ⑶hot isostatic pressing (HIP), ⑷microwave sintering, ⑸ultra-high pressure sintering, ⑹spark plasma sintering (SPS), ⑺In-situ compression molding and sintering, etc. It is often based on pressureless sintering.
