Most of the ceramics in ceramic machinery are sintered ceramics, because it is difficult to make molten molten metal flow into the model like metal and plastic, and it is made by hot die casting by its own plastic deformation property, so it is formed by powder and then sintered. The way to produce. Powder molding has various methods depending on the shape and required characteristics of the product, but there are mainly the following five. Molding is to add an organic binder to the powder, fill it in a metal mold, and press it to make it.A method of forming a shaped body with a certain strength. This method is commonly used in refractory materials, ceramic tiles, electronic ceramics, nuclear fuel particles, etc., which are mass-produced in a relatively simple shape. The advantage is that the price is low and the dimensional error of the shaped body is small. The pressure is in the range of 200-2000 kg/cm2.

       Isostatic pressing is a method of producing a uniform powder shaped body. Because it uses a rubber bag (mold), it is also called a plastic bag forming method. In this method, the powder is placed in a rubber bag, and the rubber bag containing the powder is placed in a water pressure chamber to be formed, and the pressure in the water pressure chamber is uniformly pressurized to the powder, so that a good molded body can be obtained. Dry methods are also under development. Extrusion is a method of extruding the kneaded plasticity from the die orifice. Products such as drain pipes, hollow tile pipes, and furnace core tubes are formed at a right angle to the cross section. Recently, ceramic honeycomb bodies for automobile exhaust gas purification are good application examples.

      Grouting is a slurry with fluidity prepared by using water or the like, and the slurry is injected into a porous gypsum model, and water is infiltrated into the plaster body through the contact surface to form a hard layer on the surface. This is a forming method in which the inner shape of the plaster mold is the same as the shape of the formed body. It is divided into two-sided cooking method (solid grouting method) and single-sided grouting method (hollow grouting method). Ceramics have been used very early in the production of this method. Hot die casting is a method in which plastic is added to a powder and formed by the same method as the resin molding. Although this method is suitable for the formation of complex parts, if the amount of the binder exceeds 15-25%, degreasing is difficult. This method is currently not suitable for large, thick-walled products.