The microstructure of sintered Si-Al-O-N ceramics |
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Authors: | Lewis M H Bhatti A R Lumby R J North B |
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Affiliation: | (1) Department of Physics, University of Warwick, Coventry, UK;(2) Lucas Group Research Centre, Solihull, W. Midlands, UK |
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Abstract: | Fine-grained ceramics, based on the substituted -Si3N4 crystal structure, have been prepared with near theoretical densities by pressureless sintering of compacts containing a large Y2O3 additive concentration. The microstructure contains two phases, and an Y/Al rich silicate glassy matrix, in the as-sintered condition. The matrix may be crystallized on heat treatment to a Si-substituted yttrium-aluminium garnet phase. The phase compositions and transformation mechanisms have been analysed by X-ray microanalysis, electron diffraction and imaging of thin sections.A preliminary survey of mechanical properties of these sintered ceramics shows that they are comparable with commercial hot-pressed silicon nitrides, particularly at high temperatures. The possibility of development of a range of ceramic alloys , dependent on their chemical environment and temperature of application, is discussed. |
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