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Toughening Effect and Oxidation Behavior of MoSi2 -ZrO2 Composites

Published online by Cambridge University Press:  26 February 2011

Karin Gong ,
Yiming Yao ,
Mats Sundberg ,
Xin-Hai Li ,
Erik Ström  and
Changhai Li
Karin Gong
Affiliation:
[email protected], Chalmers University of Technology, Materials and Manufacturing Technology, SE-412 96 Gothenburg,Sweden, Gothenburg, SE-412 96, Sweden, +46 31 7721251, +46 31 7721313
Yiming Yao
Affiliation:
[email protected], Chalmers University of Technology, Materials and Manufacturing Technology, Gothenburg, SE-412 96, Sweden
Mats Sundberg
Affiliation:
[email protected], Kanthal AB, Hallstahammar, SE-734 27, Sweden
Xin-Hai Li
Affiliation:
[email protected], Siemens Industrial Turbomachinery AB, Finspong, SE-612 82, Sweden
Erik Ström
Affiliation:
[email protected], Kanthal AB, Hallstahammar, SE-734 27, Sweden
Changhai Li
Affiliation:
[email protected], Chalmers University of Technology, Materials and Manufacturing Technology, Gothenburg, SE-412 96, Sweden
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Abstract

Toughening effect of ZrO2-particles on MoSi2-based materials is one of the important toughening mechanism. In this work, the influence of particle size and volume percentage of unstabilized ZrO2-addition on toughening in MoSi2-matrix composites was studied. The measured data revealed that the fine particle size, < 1 ìm, with certain volume percentages around 20% have given more effective toughening results. The tested materials were prepared by two different sintering processes: pressure-less sintering (PLS) and PLS + Hipping sintering. The results on sintered density, RT-hardness and RT-toughness indicated that the PLS process could be a practical and economical method for producing MOSi2-ZrO2 composites in industry. Oxidation behavior of MoSi2-ZrO2 composites was also studied in the work. Clearly, the ZrO2-addition made the composites having a worse oxidation resistance than the monolithic MoSi2, which means that a low ZrO2-addition should be used in the composites, as far as an acceptable toughening effect was reached.

Keywords

toughnesscompositeoxidation
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 980: Symposium II – Advanced Intermetallic-Based Alloys , 2006 , 0980-II05-35
Copyright
Copyright © Materials Research Society 2007

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