Traditional isostatic pressing molds include isostatic pressing rubber molds, silicone molds and steel molds, and there are many problems in practical applications. As a new type of polymer material, polyurethane has many advantages such as wide range of hardness, high strength, wide adjustable range of performance, wear resistance, tear resistance, oil resistance, chemical resistance, oxidation resistance and so on. The deformation of the elastic mold under the pressure of the liquid medium is transmitted to the powder in the mold. The friction between the powder and the mold wall is small, the force of the blank is uniform, and the density distribution is uniform, and the pre-pressed blank is encapsulated. In an elastic rubber mold, it is sealed and put into a high-pressure cylinder, and the green body is compressed and formed by liquid transfer. The mold is used for the molding of ceramic materials, tungsten and molybdenum materials, graphite materials, fire-resistant materials, and alloy powders.
Ceramic molding technology is one of the important processes in the preparation of ceramic materials. It is the process of transforming ceramic powder into a green body with a certain shape, volume and strength. Cold isostatic pressing is a very important ceramic molding technology. It is a method of compressing powder by transferring isotropic pressure through a fluid medium at room temperature. Compared with conventional molding technology, isostatic pressing has a high density of molding blank, and its blank density is 5%~15% higher than that of ordinary molding; and the blank density is uniform, so it is suitable for long diameters such as columnar and cylindrical shapes. than larger products. Isostatic pressing technology developed earlier and the technology is relatively mature. It is the main molding method of special ceramics at present.
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