Anion Controlled Microstructures in the Al2O3-A1N System

摘要

The phase equilibria of the pseudo-binary Al2O3-A1N composition join has been extensively investigated, especially with respect to the processing of ALON--a nitrogen stabilized aluminum oxide spinel phase that can be sintered into transparent polycyrstalline ceramics. The system exhibits a wide variety of features and resulting microstructures: two spinel phases, vapor-solid and liquid-solid eutectics, A1N polytype-like structures, and alpha-Al2O3/spinel modulated structures. This system provides a unique perspective to a series of quite different materials based on a constant cation chemistry, with a continuous variation in the O/N anion ratio. Keywords: Aluminum; Nitrogen; Composite materials; Ceramics; Aluminum oxynitride; Aluminum nitride; Aluminum oxide; Microstructure; Phase equilibria; Electron microscopy. (KT)