Hot Isostatic Pressing HIPing

Fig. 19.4. Hot-isostatic pressing ("HIPing") the powder, in a thin steel preform, is heated and compressed by high-pressure argon.

Siemer, D. D., Roy, D. M., Grutzeck, M. W., Cougar, M. L. D. Sheetz, B. E. 1997. PCT leach tests of hot isostatically pressed (HIPed) zeolitic concretes. Materials Research Society Symposium Proceedings, 465, 303-310. 

Fig. 8.159 illustrates schematically the different types of hot isostatic pressing, (a)/ (a ) and (b) / (b ) represent the conventional applications of hot isostatic pressing which ultimately result in dense products. HIPing which, because of the temperature of the process is associated with sintering (see Section 9.1), is applied to powders that are encapsulated in containers made from metal or glass (a) or to presintered bodies with closed pores (see also Section 5.3.2, Fig. 5.47). 

The hot isostatic press (HIP) uses the simultaneous application of heat and pressure. We refer to this process as HIPing and the product as being HIPed (but you will see variations on these abbreviations). A furnace is constructed within a high-pressure vessel and the objects to be pressed are placed inside. Figure 23.6 shows a typical HIP arrangement. Temperatures can be up to 2000°C and pressures are typically in the range of 30-100 MPa. A gas... 

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