The principle of dry pressing of wear-resistant ceramics
In the production process of wear-resistant ceramics, forming is a very important link, and the more commonly used forming methods are dry pressing and isostatic pressing. Today we will talk about the principle of dry pressing.
Dry pressing, also known as compression molding, is one of the most commonly used molding methods. In the production process of wear-resistant ceramics, dry press molding is to put the powder with good fluidity and suitable particle size after granulation into the metal mold cavity, apply pressure through the pressure head, the pressure head is displaced in the mold cavity, and transmit the pressure, so that the powder particles in the mold cavity are rearranged and deformed and compacted to form a ceramic green body with a certain strength and shape.
The essence of dry pressing is that under the action of external force, the particles are close to each other in the mold, and the particles are firmly connected by internal friction to maintain a certain shape. This internal friction acts on the thin layer of binder surrounding the particles that are close to each other.
As the pressure increases, the blanks will change shape, slide against each other, the gap will decrease, gradually increase the contact, and stick to each other. As the particles get closer, the force between the colloid molecules and the particles is strengthened, so the green body has a certain mechanical strength.
