Isostatic Ceramic

Isostatic pressing is to place the object to be processed in a specific mold, then put the mold with the workpiece into a closed container filled with liquid, gradually increase the pressure through the booster system, and transmit the pressure through the liquid, so that All surfaces of the object are subjected to equal pressure. Product categories: ceramic plunger, ceramic pump core, ceramic valve core, ceramic piston, ceramic bushing, ceramic suction cup, microporous ceramics, etc.; materials: alumina, zirconia, nitrided Silicon, silicon carbide. And the process of molding under the constraints of the mold.

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 molding is a very important ceramic molding technology. It is a method of compressing and molding powder materials by transmitting isotropic pressure through a fluid medium at room temperature. Compared with conventional molding technology, isostatic pressing has a high density of molded parts, which is 5% to 15% higher than that of ordinary compression molding; the density of the parts is uniform, so it is suitable for columnar, cylindrical, etc. products with large diameter ratio; in addition, isostatic pressing molding products have excellent performance, so isostatic pressing molding technology has important applications in the fields of special ceramics preparation and other fields, and has been successfully applied to some large ceramic products with complex shapes such as ceramic radome, straight air Production of arc extinguishing chamber ceramic shells, thermocouple protection ceramic sleeves, alumina or zirconia ceramic tubes for oil drilling, transparent ceramic sleeves for high-pressure sodium lamps, high-voltage ceramic insulating tubes, spark plugs, and carbon graphite products.

Isostatic pressing process

Isostatic pressing is divided into two processes: dry method and wet method. The wet process powder is put into a plastic bag, placed in a liquid medium, and directly in contact with the liquid. Since the shape and size of the plastic sheath can be changed arbitrarily according to the shape of the product, products of different shapes can be produced, while the dry method is mainly suitable for small-scale production of a single product, so the wet method is more widely used than the dry isostatic pressing.

Wet bag isostatic pressing can form products with complex shapes, but it can only be operated intermittently. Dry bag isostatic pressing can realize automatic continuous operation, but it can only form products with simple shapes such as square, round, and tubular cross-sections. Isostatic pressing can obtain uniform and dense blanks, and the firing shrinkage is small in all directions. Uniform shrinkage, but the equipment is more complicated, expensive, and the production efficiency is not high, so it is only suitable for the production of materials with special requirements.

The isostatic pressing method has the following characteristics:

(1) It can form complex, large and thin and long products that cannot be produced by ~ general methods, and the forming quality is high.

(2) The molding pressure can be easily increased without increasing the difficulty of operation, and the pressure effect is better than other dry pressing methods.

(3) Since the green body is under uniform pressure in all directions, its density is high and uniform, and its firing shrinkage is small, so it is not easy to deform.

(4) The mold is easy to make, has a long life and low cost.

(5) Less or no binder can be used.

Cold Isostatic Pressing Bags/Mold/Tooling