Abstract
X-sialon has been produced by hot pressing Si3N4-Al2O3-SiO2 powder mixtures and Si3N4 Powder-mullite gel mixtures at 1650 °C. The formation mechanism ofX-sialon has been studied and is correlated with the processing technique for the two preparation routes. Microprobe analysis of the obtainedX-sialon phase, combined with previous observed compositions and literature formulae suggests that, at 1650 °C,X-sialon exists as a narrow solid solubility region on the Si3N4-mullite line in the Si3N4-SiO2-Al2O3-AIN phase diagram. The physical, mechanical and chemical properties ofX-sialon have been evaluated.X-sialon has a modest hardness of 1280 kg mm−2, a fracture toughness of 1.7 Mpa m1/2, and an elastic modulus of 213 GPa.X-sialon exhibits excellent chemical stability in contact with iron-based alloys at 1200 °C.
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