Nd2O3-Doped Sialons with ZrO2/ZrN Additions Formed by Sintering and Hot Isostatic Pressing |
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| Authors: | Thommy Ekström Harald Herbertsson Matthew James Ian Fleck |
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| Affiliation: | Department of Inorganic Chemistry, Arrhenius Laboratory, Stockholm University, S-106 91 Stockholm, Sweden;School of Materials Science and Engineering, University of New South Wales, Kensington, NSW 2033, Australia |
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| Abstract: | β-sialon and Nd2O3-doped α-sialon materials of varying composition were prepared by sintering at 1775° and 1825°C and by glass-encapsulated hot isostatic pressing at 1700°C. Composites were also prepared by adding 2–20 wt% ZrO2 (3 mol% Nd2O3) or 2–20 wt% ZrN to the β-sialon and α-sialon matrix, respectively. Neodymium was found to be a fairly poor α-sialon stabilizer even within the α-phase solid solution area, and addition of ZrN further inhibited the formation of the α-sialon phase. A decrease in Vickers hardness and an increase in toughness with increasing content of ZrO2(Nd2O3) or ZrN were seen in both the HIPed β-sialon/ZrO2(Nd2O3) composites and the HIPed Nd2O3-stabiIized α-sialons with ZrN additions. |
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