Abstract
The sintering behavior and the mechanical and oxidation properties of Sialon were investigated by varying the composition, amount, and cationic radii of sintering additives composed of AlN-Er2O3-M2O3 (M=Y or Sc). The optimum additive composition for the pressureless sintering of Sialon was determined to be (0.6 AlN:0.4 [0.3 Er2O3:0.7 M2O3]) and the optimum content was 10-15 mass%. The maximum relative densities of Sialon using AlN-Er2O3-Y2O3 and AlN-Er2O3-Sc2O3 additives (termed SAEY and SAES) were 94.4 and 97.9% at 0.1 MPa N2, respectively. The pressureless sintered SAES sample showed fairly high strength (506 MPa) using the optimized additive composition. In both systems, the oxidation resistance was improved by decreasing the total amount of sintering additives.
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