The Classification of Isostatic Pressing
The working principle of isostatic pressing is Pascal's law: "The pressure of the medium (liquid or gas) in a closed container can be equally transmitted in all directions." Powder molding; in the past 20 years, isostatic pressing technology has been widely used in ceramic casting, atomic energy, tool manufacturing, plastics, ultra-high pressure food sterilization and graphite, ceramics, permanent magnets, high-pressure electromagnetic porcelain bottles, biological drug preparation, food preservation, High-performance materials, military and other fields.
Cold isostatic pressing technology, (Cold Isostatic Pressing, referred to as CIP)
At room temperature, rubber or plastic is usually used as the covering mold material, and the liquid is used as the pressure medium. It is mainly used for powder material molding, and provides green body for further sintering, forging or hot isostatic pressing process. The general operating pressure is 100~630MPa.
Warm isostatic pressing technology
Warm isostatic pressing technology, the pressing temperature is generally 80 ~ 120 ℃. There are also special liquid or gas transmission pressures at 250~450℃, and the operating pressure is about 300MPa. It is mainly used for graphite and polyamide rubber materials that cannot be formed by powder materials at room temperature. in order to obtain solid bodies at elevated temperatures.
Hot isostatic pressing technology
Hot isostatic pressing technology (hot isostatic pressing, referred to as HIP)
HIP is a process technology that makes materials undergo isostatic pressing under the simultaneous action of high temperature and high pressure. It is not only used for the consolidation of powder bodies. The traditional powder metallurgy process is completed in two steps of forming and sintering, and is also used for diffusion bonding of workpieces, elimination of casting defects, and production of complex-shaped parts. In hot isostatic pressing, inert gases such as argon and ammonia are generally used as the pressure transmission medium, and metal or glass is usually used as the covering material. The working temperature is generally 1000~2200℃, and the working pressure is usually 100~200MPa.
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