Two series of slip cast SiC test specimens with bimodal particle size distributions were fired in argon atmosphere. The fired RSiC specimens were characterized with different methods. During consolidation the fine-grained fraction of the bimodal particle size distribution 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" ϑ R . The dominating reaction of the evaporationcondensation-mechanism seems to be the active oxidation of silicon carbide. Overfiring of RSiC is associated with slight shrinkage.
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