Abstract
Densification of SiC powder with additives of total amount of 2,4,8 wt% Al-B-C was carried out by Spark Plasma Sintering (SPS). The unique features of the process are the possibilities of a very fast heating rate and a short holding time to obtain fully dense materials. The heating rate and applied pressure were kept at 100℃/min and 40 MPa, while the sintering temperature and holding time varied from 1700-1800℃ for 10-40 min, respectively. The SPS-sintered specimens with different amount of Al-B-C at 1800℃ reached near-theoretical density. The 3C→6H, 15R→4H phase transformation of SiC was enhanced by increasing the additive amount. The microstructure of SiC sintered up to 1750℃ consisted of fine equiaxed grains. In contrast, the growth of large of large elongated grains in small matrix grains was shown in sintered bodies at 1800℃, and the plate-like grains interlocking microstructure had been developed by increasing the holding time at 1800℃. The grain growth rate decreases with increasing amount of Al-B-C in SiC starting powder, however, the both of volume fraction and aspect ratio of large grains in sintered body increased.
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