Abstract
SiC ceramics were sintered with Mg2Si and Ni3Al additives at 900–1300 °C. Densification was achieved at temperatures as low as 1300 °C, and the microhardness and fracture toughness were significantly improved from 4.95 GPa to 8.17 MPa m1/2 for the ceramic without Ni3Al to 13.59 GPa and 10.40 MPa m1/2 for the ceramic sintered with 10 wt% Ni3Al, representing improvements of 174.55% and 27.29%, respectively. Some of the Ni3Al was converted into Ni with a (110)Ni3Al || (002)Ni crystal morphology, and the SiC bonded to Ni3Al with a (103)SiC || (112)Ni3Al crystal morphology. These well-matched crystal morphologies led to perfect lattice coherence. The Ni-rich regions prevented the elongation of cracks, resulting in improved fracture toughness.
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