The sliding-wear behavior of ultrafine-grained SiC densified by spark plasma sintering (SPS) with 3Y(2)O(3) + 5Al(2)O(3) or Y3Al5O12 additives was compared to elucidate the effect of the intergranular-phase source. Significantly greater sliding-wear resistance (i.e. lower mild- and severe-wear rates, and delayed mild-to-severe wear transition) is observed with the Y3Al5O12 additive, due to its carbothermal reduction during SPS resulting in a harder YAlO3 phase while reducing the intergranular phase content. Implications for the processing of superior SiC triboceramics are discussed. (C) 2013 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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