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Mg-Si-AI-O-N Glasses Prepared By Nitriding Cordierite Powders Derived from Polymer Precursors

Published online by Cambridge University Press:  25 February 2011

Richard M. Laine ,
Clint R. Bickmore ,
Kurt F. Waldner ,
Brian L. Mueller  and
Hal W. Estry
Richard M. Laine
Affiliation:
Departments of Materials Science and Engineering, and Chemistry University of Michigan, Ann Arbor, MI 48109-2136
Clint R. Bickmore
Affiliation:
Departments of Materials Science and Engineering, and Chemistry University of Michigan, Ann Arbor, MI 48109-2136
Kurt F. Waldner
Affiliation:
Departments of Materials Science and Engineering, and Chemistry University of Michigan, Ann Arbor, MI 48109-2136
Brian L. Mueller
Affiliation:
Departments of Materials Science and Engineering, and Chemistry University of Michigan, Ann Arbor, MI 48109-2136
Hal W. Estry
Affiliation:
Departments of Materials Science and Engineering, and Chemistry University of Michigan, Ann Arbor, MI 48109-2136
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Abstract

We have previously reported the synthesis of cordierite polymer precursors directly from MgO, SiO2 and alumina.1 Removal of organics at 400°C in air and/or in oxygen gave amorphous, atomically mixed, oxide powders with surface areas of 250-400 m2/g. It is possible to convert these high surface area oxide powders to Mg-Si-Al-O-N powders by heating in a flowing NH3 atmosphere. The effects of selected processing conditions on nitrogen incorporation, in a set of well defined oxide powders, were examined. The powders are nitrided in flowing NH3, at temperatures of 700-1200°C, to obtain N contents of up to 5 atomic percent.

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References

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