Explanation
The powder is loaded into the steel mold, and the powder is pressed through the die punch to pressing into a compact of certain size and shape. After pressure relief, the billet comes out of the female mold. During pressing, friction exists between powder particle, between powder and die punch, and between die wall, resulting in loss of throwing force, which results in uneven distribution of density and strength of compact. Therefore, double-action pressing or movable die pressing is commonly used, and a small amount of organic lubricant containing polar functional groups (such as oleic acid, and some powders are added with organic adhesive (such as polyvinyl alcohol) to enhance the bonding force of powder.
Classification
Inorganic non-metallic materials -> Advanced ceramics -> Ceramic fabrication