ZrO sub 2 reinforced-MoSi sub 2 matrix composites

Conference · Tue Jan 01 00:00:00 EST 1991

OSTI ID:5808009

Petrovic, J J; Honnell, R E; Mitchell, T E ^[1]; Wade, R K ^[2]; McClellan, K J ^[3]

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1. Los Alamos National Lab., NM (USA)
2. Arizona Materials Lab., Tucson, AZ (USA)
3. Case Western Reserve Univ., Cleveland, OH (USA). Dept. of Materials Science and Engineering

ZrO{sub 2} particle-MoSi{sub 2} matrix composites were fabricated by wet processing/hot pressing, using high quality unstabilized, partially stabilized, and fully stabilized ZrO{sub 2} powders. Composite room temperature indentation fracture toughness increased with increasing volume fraction of ZrO{sub 2} reinforcement. Unstabilized ZrO{sub 2} produced the highest composite fracture toughness, 7.8 MPa m{sup {1/2}} as compared to 2.6 MPa m{sup {1/2}} for pure MoSi{sub 2}. Unstabilized ZrO{sub 2} composites exhibited matrix microcracking, and the spontaneous tetragonal-to-monoclinic ZrO{sub 2} phase transformation induced significant plastic deformation in the MoSi{sub 2} matrix. Partially stabilized ZrO{sub 2} produced a lesser extent of composite fracture toughening, possibly as a result of an inhomogeneous ZrO{sub 2} particle distribution and presence of a glassy phase. 13 refs., 6 figs., 1 tab.

• Research Organization: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
• Sponsoring Organization: USDOE; USDOE, Washington, DC (USA)
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 5808009
• Report Number(s): LA-UR-91-1642; CONF-910162-7; ON: DE91013074
• Resource Relation: Conference: 15. annual conference on composites and advanced ceramics, Cocoa Beach, FL (USA), 13-16 Jan 1991
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
COMPOSITE MATERIALS
FABRICATION
FRACTURE PROPERTIES
MOLYBDENUM SILICIDES
ZIRCONIUM OXIDES
MATRIX MATERIALS
MICROSTRUCTURE
TRANSMISSION ELECTRON MICROSCOPY
CHALCOGENIDES
CRYSTAL STRUCTURE
ELECTRON MICROSCOPY
MATERIALS
MECHANICAL PROPERTIES
MICROSCOPY
MOLYBDENUM COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
REFRACTORY METAL COMPOUNDS
SILICIDES
SILICON COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
ZIRCONIUM COMPOUNDS
360603* - Materials- Properties
360601 - Other Materials- Preparation & Manufacture