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Effect of Si 3 N 4 Powder Reactivity on the Preparation of the Si 2 N 2 O‐Al 2 O3 Silicon Aluminum Oxynitride Solid Solution
Author(s) -
SEKERCIOGLU I.,
WILLS R. R.
Publication year - 1979
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1979.tb12738.x
Subject(s) - reactivity (psychology) , sialon , silicon , materials science , ceramic , nitrogen , chlorine , analytical chemistry (journal) , aluminium oxides , hot pressing , mineralogy , crystallography , metallurgy , chemistry , catalysis , organic chemistry , medicine , alternative medicine , pathology
Dense high‐purity Si 2 N 2 O‐Al 2 O3 silicon aluminum oxynitride (O'‐sialon) was prepared by reactive hot‐pressing of an Si 3 N 4 ‐Al 2 O 3 ‐SiO 2 mixture. The formation of a single‐phase material was found to be critically dependent on the Si 3 N 4 powder in the Si 3 N4‐Al 2 O 3 ‐SiO2 starting mixture. It is suggested that evolution of a chlorine‐ and nitrogen‐containing species may enhance the reactivity of Si 3 N 4 in this reaction. Densities of O'‐sialons are very similar to that of Si 2 N 2 O (2.82 g/cm 3 ), the widely quoted value in the ceramics literature of 3.1 g/cm 3 for the density of Si 2 N 2 O being incorrect.