R-Curve Behavior in Zirconia-Reinforced Molybdenum Disilicide Composites

R‐curves for hot‐pressed 20 vol% ZrO2 (2.5‐YPSZ and 8‐YPSZ) reinforced MoSi2 composites were evaluated using the indentation/bend technique. Results indicated a modest increase in the material toughness for both composites. Experimental R‐curves were compared with theoretically predicted R‐curves to...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 1992-01, Vol.75 (1), p.23-27
Main Authors: Bhattacharya, Arun K., Petrovic, John J.
Format: Article
Language:English
Subjects:
360201 - Ceramics, Cermets, & Refractories- Preparation & Fabrication
360202 - Ceramics, Cermets, & Refractories- Structure & Phase Studies
360203 - Ceramics, Cermets, & Refractories- Mechanical Properties
Applied sciences
Building materials. Ceramics. Glasses
Ceramic industries
CHALCOGENIDES
CHEMICAL COMPOSITION
Chemical industry and chemicals
Exact sciences and technology
FABRICATION
FRACTURE PROPERTIES
fracture toughness
HOT PRESSING
MATERIALS
MATERIALS SCIENCE
MATERIALS WORKING
MECHANICAL PROPERTIES
molybdenum
MOLYBDENUM COMPOUNDS
MOLYBDENUM SILICIDES
OXIDES
OXYGEN COMPOUNDS
PHASE STABILITY
PHASE TRANSFORMATIONS
PRESSING
R-curve
REFRACTORY METAL COMPOUNDS
REINFORCED MATERIALS
SILICIDES
SILICON COMPOUNDS
STABILITY
Structural ceramics
Technical ceramics
TRANSITION ELEMENT COMPOUNDS
YIELD STRENGTH
zirconia
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES
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Summary:R‐curves for hot‐pressed 20 vol% ZrO2 (2.5‐YPSZ and 8‐YPSZ) reinforced MoSi2 composites were evaluated using the indentation/bend technique. Results indicated a modest increase in the material toughness for both composites. Experimental R‐curves were compared with theoretically predicted R‐curves to evaluate the critical transformation stress for the partially stabilized ZrO2 composite. A high critical transformation stress value obtained was indicative of the inhibition of transformation toughening effects due to microstructural inhomogeneity in the partially stabilized ZrO2‐MoSi2 composites.
ISSN:0002-7820
1551-2916
DOI:10.1111/j.1151-2916.1992.tb05436.x