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Additives out of the systems Al–C, Al–B–C and B–C have been investigated with respect to densification and microstructure development of SiC produced by pressureless sintering and subsequent post-hot isostatically pressing (HIP) treatment. Within the investigated compositional range, the Al–B–C and B–C systems provide sufficient densification to reach pore closure during pressureless sintering and nearly theoretical density during the HIP step of the process. Densification in the Al–B–C system takes place at significantly reduced temperatures, namely ~1900 °C vs. ~2050 °C in the Al- free product. Dilatometer experiments and microstructure development indicate the presence of a liquid phase in this system during sintering. Liquid phase sintering in the SiC/(Al–B–C) system vs. solid state sintering in the SiC/(B–C) system will be discussed on the basis of literature data and previous experimental studies of the authors.

Aspects of Sintering Additives for Processing and Microstructure Development of HIP-SSiC