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Silicon nitride composites materials with an improved high temperature Oxidation Resistance

: Klemm, Hagen; Herrmann, Mathias; Schubert, Christian


Singh, J.P. ; American Ceramic Society -ACerS-, Westerville/Ohio:
21st Annual Conference on Composites, Advanced Ceramics, Materials, and Structures 1997. Proceedings : January 12-16, 1997, Cocoa Beach, Florida
Westerville, Ohio: ACerS, 1997 (Ceramic engineering and science proceedings 18. 1997, Nr.3-4)
ISBN: 978-0-470-37549-5
ISBN: 978-0-470-29443-7
ISBN: 978-0-470-29444-4
Annual Conference on Composites, Advanced Ceramics Materials, and Structures <21, 1997, Cocoa Beach/Fla.>
Conference Paper
Fraunhofer IKTS ()
composite materials; oxidation mechanism; monolithic material; Mechanical Loading; x-ray diffractometry

The oxidation resistance of Si3N4 based materials at 1500°C was studied. Si3N4/SiC- and Si3N4/MoSi2-composite materials were found to obey a less severe oxidation mechanism in comparison to the monolithic Si3N4 material, with the consequence of an improved microstructural and mechanical stability after high temperature oxidation. An oxidation mechanism based on the formation of Si2ON2 instead of SiO2 is proposed to be the main reason for the different oxidation behavior of the composite materials.