The production process of alumina fine ceramics
The finishing process of Alumina Fine Ceramics is to first prepare the alumina powder entering the factory into powder materials by different molding processes according to different product requirements. The particle size of this powder is required to be less than 1 μm. If highpurity Alumina Fine Ceramics parts or precision ceramic structural parts are manufactured, in addition to the alumina purity of 99.99%, the powder needs to be ultra-finely pulverized and used. The particle size distribution of the powder that has been ultra-finely pulverized is uniform. Then the ultra-finely pulverized powder is extruded or injection molded. During the preparation process, the powder needs to be introduced with a binder and a plasticizer. It should be noted that the binder and the plasticizer have a certain ratio. Require.
In general, it is a thermoplastic or resin with a weight ratio of 10-30%. The organic binder should be uniformly mixed with the alumina powder at a temperature of 150-200 degrees Celsius to facilitate the molding operation. If the hot pressing process is used, the powder raw material does not need to be added with a binder.
If the semi-automatic or fully automatic dry pressing method is used, there are special technological requirements for the powder, which requires spray granulation to process the powder. The finished product of Alumina Fine Ceramicss is made into a spherical shape, which is also beneficial to improve the fluidity of the powder and facilitate the automatic filling of the mold wall during the molding process of the powder material. In addition, in order to reduce the friction between the powder and the die wall, it is also necessary to add 1-2% lubricants, such as stearic acid, and the binder PVA.
The strengthening process of Alumina Fine Ceramicss is a further improvement on this basis, not only from the production process of the product, but also has obvious effects on the improvement of the success rate of the product