Two series of slip-cast SiC test specimens with a bimodal particle size distribution were fired in an argon atmosphere. The fired RSiC specimens were characterized with different methods. During consolidation, the fine-grained fraction begins to decompose at relatively low temperatures and is deposited on the surfaces of the coarse particles. This non-shrinking evaporation-condensation mechanism seems to be completed at a fixed temperature that is characteristic of each specimen composition. This characteristic temperature is defined as the "maximum recrystallization temperature". Overfiring of RSiC is associated with slight shrinkage. At elevated temperatures a swelling process ensues. In all the stages of consolidation studied, grain growth phenomena were observed.
