Hot Isostatic Pressing is a manufacturing technique designed to increase the density of materials by reducing or eliminating their porosity or microporosity thus creating fully dense ‘wrought’ materials. Hot Isostatic Pressing (HIP) is a process employed to enhance or create materials or products with different mechanical properties by improving density, composition and dynamic strength.
Cold isostatic Pressing(CIP) is a compaction process for powders enclosed in an elastomer mold. The mold is placed in a pressure chamberand high pressure is applied uniformly from all sides through a liquid medium. Applications include preforms of powder metal advanced ceramics. cemented carbides, refractory materials, graphite, and plastics.
Material in powder form is sealed into a flexible mould (or bag) situated inside a pressure vessel. Hydrostatic pressure is applied to the outside of the mould, until the powder molecules inside have bonded sufficiently. Subsequent finishing processes may be required.
In the isostatic pressing process, products are put in the closed container full of liquid and applied the equal pressure to each surface to increase their density under high pressure, thus getting the required shapes. With the progress of science and technology, isostatic presses are widely used in the forming of high-temperature refractory, ceramics, cemented carbide, lanthanon permanent magnet, carbon material and rare metal powder.