Dry pressing of wear-resistant ceramics: Dry pressing is putting the powder (5% to 8% moisture) into a metal mold and compressing it under the action of force (usually one-way pressure), and in the voids of the blank Part of the gas is discharged, the particles are displaced, gradually close together, and close to each other, and finally form a blank with the same cross-section as the mold and the shape of the upper and lower sides is determined by the upper and lower pressure heads of the mold. The size of the cavities in the formed body is significantly reduced, the number is greatly reduced, the density is significantly increased, and a certain degree of strength is obtained. The advantages of dry press molding are high production efficiency, less labor, low scrap rate, short production cycle, high density, and high strength, suitable for mass industrial production; the disadvantage is that the shape of the molded product is relatively limited, and the mold cost is high. , The strength of the body is low, the compactness of the body is inconsistent, and the uniformity of the structure is relatively poor. In the field of ceramic production, the products manufactured by the dry pressing method mainly include large pieces of thick porcelain, wear-resistant porcelain lining tiles, sealing rings, etc.
Grouting forming method of wear-resistant ceramics: Grouting forming is the earliest forming method of alumina wear-resistant ceramics. Due to the use of plaster molds, the cost is low and it is easy to form large and complex-shaped parts. The key to grouting is to prepare alumina slurry. Usually, water is used as the flux medium, and then the degumming agent and adhesive are added. After sufficient grinding, the gas is discharged and then poured into the plaster mold. Since the capillaries of the plaster mold absorb moisture, the slurry solidifies in the mold. In the hollow grouting process, when the adsorbed slurry on the mold wall reaches the required thickness, the excess slurry needs to be poured out. To reduce the shrinkage of the green body, a high-concentration slurry should be used as much as possible.
