zirconiaceramicAfter the material is sintered, it still needs to be finished. For example, products that can be used as artificial bone require a high surface finish, like a mirror, to Increase lubricity. Due tozirconia< /span>Ceramic materials have higher hardness and need to be used more Hard abrasive polished tile material for finishing.
zirconiaWhat aspects should be paid attention to in the injection molding technology of ceramics? MingruiZirconium oxideCeramic manufacturers have summarized the following points for you:
Degreasing: This process is also called removing the binder. Usually the heating rate is 3~5℃/b, and it takes about 5~10 seconds. However, when carried out in a protective atmosphere with a pressure of 0.5MPa, degreasing can be completed in 40 hours.
Sintering: Thermal and other parameters can be determined according to the type of ceramics Certainly. The linear shrinkage rate during sintering is about 15-20%. Works with complex shapes or thick walls are prone to cracks during sintering, so care should be taken to prevent them.
Fluidity of raw materials: Ceramic particles used for injection molding are generally It is composed of 80-90% (important ratio, the same below) powder and 10-20% binder. The binder is removed during the degreasing process, so the minimum addition amount is appropriate. However, it should be noted that if the addition amount is insufficient, the molding effect will be affected. In addition, the fluidity of ceramic particles becomes worse as the particle size becomes smaller and the shape deviates further from a spherical shape. Therefore, liquidity should be tested in the simplest possible way.
Defects caused by forming conditions: If the forming conditions are incorrect, meetingproduce various defects. The most critical one is the welding line. If the formed body has through holes or blind holes, this defect is prone to occur. Therefore, attention must be paid to the design of the mold, especially the type, location, size and number of openings. At the same time, attention should be paid to the balance between injection temperature and speed of injection molding.
In addition, in order to avoid surface roughness, cracks, and strips Defects such as marks and deformation. When molding is difficult, an adaptive controller can be installed in the injection molding machine to perform fine control.
