Fracture toughness of MgCr/sub 2/O/sub 4/-based refractory composites
Conference
·
OSTI ID:6436828
The effects of unstabilized ZrO/sub 2/ and W inclusions on the fracture surface energy and thermal-shock resistance of MgCr/sub 2/O/sub 4/ have been characterized. The fracture surface energy increased with increasing ZrO/sub 2/ content and decreased as the ZrO/sub 2/ content increased further. The increase in fracture surface energy for MgCr/sub 2/O/sub 4/ /minus/ W with increasing W content was monotonic for the range of composition studied (less than or equal to10.3 vol % W). It is proposed that these fourfold increases in fracture surface energy result from the absorption of energy due to microcrack formation in the MgCr/sub 2/O/sub 4/ matrix, which results from the tensile stresses due to the mismatch in thermal expansion coefficient and/or elastic modulus between the matrix and inclusions. In addition, for MgCr/sub 2/O/sub 4/ /minus/ ZrO/sub 2/ composites, a major cause of microcracking is the tetragonal ..-->.. monoclinic phase transformation of ZrO/sub 2/ and the associated volume expansion. Thermal quench experiments indicated substantial improvements in the thermal-shock resistance of MgCr/sub 2/O/sub 4/ with appropriate ZrO/sub 2/ and W additions. 32 refs., 9 figs., 3 tabs.
- Research Organization:
- Argonne National Lab., IL (USA). Materials and Components Technology Div.
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 6436828
- Report Number(s):
- CONF-881207-3; ON: DE89009847
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
01 COAL, LIGNITE, AND PEAT
010404* -- Coal
Lignite
& Peat-- Gasification
36 MATERIALS SCIENCE
360602 -- Other Materials-- Structure & Phase Studies
360603 -- Materials-- Properties
ALKALINE EARTH METAL COMPOUNDS
CHALCOGENIDES
CHROMIUM COMPOUNDS
CHROMIUM OXIDES
COMPOSITE MATERIALS
CRYSTAL STRUCTURE
ELEMENTS
ENERGY
FLEXURAL STRENGTH
FRACTURE PROPERTIES
FREE ENERGY
INCLUSIONS
MAGNESIUM COMPOUNDS
MAGNESIUM OXIDES
MATERIALS
MECHANICAL PROPERTIES
METALS
MICROSTRUCTURE
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
SURFACE ENERGY
SURFACE PROPERTIES
THERMAL SHOCK
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
TUNGSTEN
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES
010404* -- Coal
Lignite
& Peat-- Gasification
36 MATERIALS SCIENCE
360602 -- Other Materials-- Structure & Phase Studies
360603 -- Materials-- Properties
ALKALINE EARTH METAL COMPOUNDS
CHALCOGENIDES
CHROMIUM COMPOUNDS
CHROMIUM OXIDES
COMPOSITE MATERIALS
CRYSTAL STRUCTURE
ELEMENTS
ENERGY
FLEXURAL STRENGTH
FRACTURE PROPERTIES
FREE ENERGY
INCLUSIONS
MAGNESIUM COMPOUNDS
MAGNESIUM OXIDES
MATERIALS
MECHANICAL PROPERTIES
METALS
MICROSTRUCTURE
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
SURFACE ENERGY
SURFACE PROPERTIES
THERMAL SHOCK
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
TUNGSTEN
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES