Abstract
Dense silicon carbide (SiC) ceramics were fabricated through hot-pressing with an innovative additive combination of AlN and rare earth fluorides (ReF3, Re= La, Nd and Gd). Effects of these additives on the microstructure, phase composition and thermal conductivity of SiC ceramics were evaluated. All samples showed compact microstructures, high densities and clean grain boundaries without visible secondary phases. Sample sintered with 4 wt%AlN and 1 wt%NdF3 (4A1Nd sample) exhibited the highest thermal conductivity (152.3W/m·K) amongst all. Impedance spectroscopy analysis was employed to associate with the thermal conductivity variations in different samples by analyzing defects and impurities. 4A1Nd sample exhibited the highest fitting grain and grain boundary resistances among all samples, indicated its lowest concentration of vacancies and impurities, which suggested the best impurity purifying ability of AlN and NdF3 combination. On the contrary, the sample sintered with 4 wt%AlN (4A sample) exhibited a higher concentration of defects than other ReF3 added samples. Therefore, the AlN-ReF3 additive combinations are promising in both tailoring and improving the thermal conductivity of SiC ceramics.
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