The microstructure of hot-pressed sialon polytypes
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The sialons-phases in the Si-Al-O-N and related systems — form the basis of a new group of engineering ceramics, the successful application of which depends on their chemical stability and resistance to microstructural changes at elevated temperature. In the Si-Al-O-N system a new series of polytypes exists in which the structure is determined by the metal: non-metal atom ratio. The polytypes coexist in extensive two-phase regions which are important in determining the way that microstructure and properties develop during the fabrication and subsequent use of the material. In an electron microscopic investigation of some sialon polytypes, diffraction contrast and direct lattice imaging are used to follow changes in microstructure during hot-pressing, and to determine the nature of lattice imperfections and stacking arrangements.
KeywordsSilicon Nitride Astigmatism Sialon Diffraction Contrast Image Resolution Lattice Image
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- 6.D. P. Thompson, paper presented to XI International Congress of Crystallography, Warsaw, 1978.Google Scholar