Hot isostatic pressure impregnation carbonization HIPIC

The application of heat to a pitch causes it to soften and flow and henee requires containment during carbonization. The pitch is processed by employing hot isostatic pressure 

Standard HIPIC cycle of pitch at about 100 MPa for impregnation and carbonization. Source Reprinted with permission from Johnson AC, Pinoli PC, Keller RL, Optimization of carbon-carbon processing, 74 Biennial Conference on Carbon, American Carbon Committee, Penn State University, 238, Jun 1979. Copyright 1979, American Chemical Society. 

Another practice is to place the preform in a special metal container or can, which is evacuated and sealed by electron beam welding. The metal container acts like a pressure bag transmitting pressure throughout the workpiece [84]. 

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Hot isostatic pressing (HIP), 16 169 cemented carbides, 4 657 ceramics processing, 5 662 Hot isostatic pressure impregnation carbonization (HIPIC), 26 767 Hot-melt adhesives, 1 530-532... 

Figure 14.15 Hot Isostatic Pressure Impregnation Carbonization (HIPIC) furnace. Source Reprinted with permission from HosomuraT, Okamoto H, /WaferSc/Eng, A 143(1-2), 223-229,1991. Copyright 1991, Elsevier.

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