What are the reasons for the delamination of white fused alumina powder products
The white fused alumina powder is a relatively stable material with good insulation properties. It is suitable for some advanced polishing and refractory materials. Therefore, it is more favored by users during application, so it is in the synthesis Occasionally some delamination occurs during the production, so what is the reason for this?
1. When the white fused alumina powder is subjected to high pressure when processing the finished product, the mold sleeve becomes larger, and when it is not pressurized, it shrinks, causing the middle layer to crack and bulge up and down.
2. The gas in the molding material has not escaped. The two sides have been compacted and concentrated in the middle to form an air layer. After the external pressure is removed, the gas expands into a middle layer.
3. Moisture moves downward from the pressurized surface. Double-sided pressure causes moisture concentration in the middle and lower parts and lowers the strength. This also causes layered waste products. Even if no cracks appear after molding, cracks may occur during firing, so when drying is like It is more reasonable to be able to turn the board and dry.
4. When the pressure is very high, the blank has a higher elasticity. The smaller the particle size of the white corundum powder, the closer the contact between the particles, and the smaller the change in stress transmission. In the pressing, double-sided pressure is used, and the middle layer of the product is the weakest. The friction force is different from the upper, the middle and the lower, and the elasticity is different. Therefore, layer cracks are generated under the action of elastic stress.
In the production process of white fused alumina powder products, first of all, there must be strict processing procedures. Secondly, we must process them according to its performance and its operating items during the processing process to avoid various subsequent occurrences. Question, then I hope that through today’s introduction, everyone can be more attentive in the process of making the finished product.