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TitleO1-SiAlON to O-SiAlON phase transformation studied using spark plasma sintering
Publication TypeBook
Year of Publication2003
AuthorsBarris, G.C., Shen Z., Nygren M., and Brown I.W.M.
Series TitleKey Engineering Materials
Number of Pages37 - 42
ISBN10139826 (ISSN)
KeywordsCeramic materials, Crystal microstructure, Hardness, Phase transitions, Pressure effects, Silicon compounds, Sintering, Spark plasma sintering (SPS), Toughness
AbstractO1-sialon is a low temperature polymorph of O-sialon that can be synthesised in good yield at less than 1350°C, but rapidly transforms to O-sialon at higher temperatures, particularly in the presence of an aluminosilicate liquid phase. The O1-sialon to O-sialon phase transformation was investigated by spark plasma sintering (SPS). Dense O-sialon bodies (composition: Si1.85Al0.15O1.15N1.85, with 0 to 6 wt% Y2O3) with nano-scale microstructures and strengths of up to 860 MPa (ball on ring method) were obtained by sintering at 1400 to 1700°C for 0 to 5 minutes under an applied uniaxial pressure of 50 to 135 MPa. The effect of the O1-sialon to O-sialon phase transformation on the microstructure and properties (strength, hardness and toughness) of sintered O-sialon ceramic is examined.

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