What's Classification of isostatic pressing mold?
Isostatic pressing molds are used for isostatic forming of advanced ceramics, special ceramics, hard alloys, graphite, and other materials. The rubber sleeve molds and supporting fixtures for isostatic pressing ensure that the powder is evenly pressed from all directions under high pressure. This results in a green body with high and uniform density, significantly reducing deformation and shrinkage during the sintering process, and preventing sintering cracks caused by stress due to density differences in traditionally formed green bodies.
Additionally, isostatic pressing operations are simple, the forming pressure is easy to adjust, and the BEIQIAO isostatic pressing molds are easy to manufacture, precise, and reusable. Little or no temporary binders are needed in the clay. Isostatic pressing can be used for pressing complex shapes that are difficult to form using traditional methods, such as long nozzles, immersion nozzles, tuyere bricks, integral stoppers, and more.
(1) Wet-bag method cold isostatic press. In this method, the mold is suspended in a high-pressure vessel, which can accommodate several molds based on the product size. It is suitable for small batches of products with small dimensions and complex shapes. This method is mainly used for producing carbon products.
Dry-bag method cold isostatic press. This method is suitable for larger products with higher production volumes, and the equipment used is different from the wet-bag method cold isostatic press. It includes a pressure punch, a limiter, and an ejector. The elastic mold is fixed in the high-pressure vessel and positioned with a limiter, hence also known as the fixed mold method. During production, the pressure punch loads the powder into the mold and seals the top. During pressurization, the liquid medium is injected into the vessel and the outer surface of the elastic mold to apply pressure. For demolding, the mold does not need to be removed; the formed green body is ejected using an ejector. This isostatic pressing equipment is commonly used for mass-producing special refractory materials.
Isostatic pressing can be broadly divided into cold isostatic pressing (CIP) and hot isostatic pressing (HIP). Cold isostatic pressing is performed at room temperature, while hot isostatic pressing is a special sintering method conducted at high temperature and pressure. Hot isostatic pressing is mainly used for forming high-performance powder material products, such as powder metallurgy superalloys, powder metallurgy high-speed steels, and ceramic materials.
Isostatic presses place the product in a sealed container filled with liquid. Upon application of electrical power, the liquid exerts equal pressure on all surfaces of the sample. In a high-pressure environment, the density of the product increases, the gaps between the particles decrease, and the desired shape is obtained. With technological advancements, isostatic presses are increasingly used for forming powder metallurgy, composite materials, refractory materials, ceramics, hard alloys, and other materials.