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Fabrication and Characterization of a Functionally Gradient Mo-MoSi2 Composite

Published online by Cambridge University Press:  25 February 2011

Gaurav Agarwal ,
Wen-Yi Lin  and
Robert. F. Speyer
Gaurav Agarwal
Affiliation:
School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta GA 30332-0245
Wen-Yi Lin
Affiliation:
School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta GA 30332-0245
Robert. F. Speyer
Affiliation:
School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta GA 30332-0245
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Abstract

For the application of immersed combustion-radiant tubes in glass melters, a Mo-MoSi2 functionally gradient composite was developed. A gradient profile mixture with varying amounts of powders of these two compounds was hot pressed at 1650°C and 17.4 MPa. Mo5Si3, and Mo3Si reaction products were detected by XRD in the hot pressed composite. Limited cracking was apparent in regions where pure Mo regions applied tensile stresses to regions rich in Mo3Si product. Cyclic heat treatments in a reducing atmosphere showed no signs of further CTE mismatch induced cracking, but did indicate a propensity to creep under load at ∼ 1400°C. A functionally gradient material with MoSi2 on all exterior surfaces showed excellent oxidation protection to the Mo center.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 322: Symposium F – High-Temperature Silicides and Refractory Alloys , 1993 , 297
Copyright
Copyright © Materials Research Society 1994

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References

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