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Cyclic Oxidation Resistance of MoSi2/20v% Nb Composites

Published online by Cambridge University Press:  25 February 2011

D.E. Alman  and
N.S. Stoloff
D.E. Alman
Affiliation:
Materials Engineering Department, Rensselaer Polytechnic Institute, Troy, New York 12180
N.S. Stoloff
Affiliation:
Materials Engineering Department, Rensselaer Polytechnic Institute, Troy, New York 12180
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Abstract

The effect of Nb morphology on the 1200°C cyclic oxidation resistance of MoSi2/2Ov%Nb composites was investigated. Niobium was incorporated into MoSi2 as particles, random short fibers and continuous aligned fibers. After oxidation, it was found all that the composites had lost weight and essentially disintegrated. This was due to spalling of both the Nb2O5 scale and the MoSi2 matrix. The spalling of the matrix was a result of cracks originating from the oxidized Nb and propagating through the MoSi2 matrix. These cracks arose from two sources: (1) the volume expansion associated with the transformation of Nb to Nb2O5 and (2) the difference in thermal expansion between Nb2O5 and MoSi2. Composites with smaller diameter Nb reinforcements did not disintegrate as rapidly as composites with larger sized Nb reinforcements. This was attributed to the effect of reinforcement size on CTE mismatch cracking.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 322: Symposium F – High-Temperature Silicides and Refractory Alloys , 1993 , 255
Copyright
Copyright © Materials Research Society 1994

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