Isostatic Pressing Ceramic
Isostatic pressing is a special forming method developed on the basis of traditional dry pressing! It uses the fluid to transmit pressure, and applies pressure evenly to the powder in the elastic mold from all directions. Due to the consistency of the internal pressure of the fluid, the pressure on the powder in all directions is the same, so the difference in the internal density of the green body can be avoided.
Isostatic pressing is divided into wet isostatic pressing and dry isostatic pressing. Wet isostatic pressing is to enclose the pre-pressed blank in an elastic plastic or rubber mold, put it into a high-pressure cylinder after sealing, and press the blank to form it through liquid transfer. Dry isostatic pressing is to semi-fix the elastic mold, not soaked in the liquid medium, but sealed by the upper and lower pistons. The pressure pump injects the liquid medium between the high-pressure cylinder and the pressurized rubber, and the pressure is transmitted through the liquid and the pressurized rubber to form the green body under pressure.
The wear-resistant ceramic tube produced by the isostatic pressing process has the characteristics of uniform structure and high density. The sintering shrinkage rate is small, the mold cost is low, the production efficiency is high, and it can form complex shapes, slender products, large-sized products and precision-sized products. Advanced molding methods, such as spark plugs, ceramic balls, plungers, vacuum tube shells and other products produced by ceramics, show more and more broad application prospects.
