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Comparison of Properties of Sintered and Sintered Reaction-Bonded Silicon Nitride Fabricated by Microwave and Conventional Heating

Published online by Cambridge University Press:  15 February 2011

Terry N. Tiegs
Affiliation:
Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, Tennessee 37831–6087
James O. Kiggans Jr
Affiliation:
Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, Tennessee 37831–6087
H. T. Lin
Affiliation:
Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, Tennessee 37831–6087
Craig A. Willkens
Affiliation:
St. Gobain/Norton Industrial Ceramics, Goddard Rd., Northboro, MA 01532–1545
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Abstract

A comparison of microwave and conventional processing of silicon nitride-based ceramics was performed to identify any differences between the two, such as improved fabrication parameters or increased mechanical properties. Two areas of thermal processing were examined: (1) sintered silicon nitride (SSN) and (2) sintered reaction-bonded silicon nitride (SRBSN). The SSN powder compacts showed improved densification and enhanced grain growth. SRBSN materials were fabricated in the microwave with a one-step process using cost-effective raw materials. The SRBSN materials had properties appropriate for structural applications. Observed increases in fracture toughness for the microwave processed SRBSN materials were attributable to enhanced elongated grain growth.

Type
Research Article
Copyright
Copyright © Materials Research Society 1994

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