Silicon carbide whisker-zirconia reinforced mullite and alumina ceramics
This patent describes a SiC whisker-reinforced ceramic composite characterized by at least one of increased flexural strength and resistance to fracture, comprising: a composite defined by a matrix of mullite or alumina with an adequate concentration of zirconia in a monoclinic phase or a tetragonal phase to provide an increase in at least one of flexural strength and fracture toughness of the SiC whisker-reinforced composite over SiC whisker-reinforced composites provided without the zirconia addition; and with about 5 to 30 vol. % SiC whiskers homogeneously dispersed therein. The SiC whiskers have a mono-crystalline structure and a size range of about 0.6 micrometer in diameter and a length of about 10 to 80 micrometers. The whiskers are characterized in the composite by causing crack deflection and crack bridging and by whisker pull-out from the matrix when the composite is subjected to crackforming stresses.
- Assignee:
- Dept. of Energy, Washington, DC
- Patent Number(s):
- US 4657877
- OSTI ID:
- 6561024
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
360203 -- Ceramics
Cermets
& Refractories-- Mechanical Properties
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CARBIDES
CARBON COMPOUNDS
CERAMICS
CHALCOGENIDES
COMPOSITE MATERIALS
CRACK PROPAGATION
CRYSTALS
FLEXURAL STRENGTH
FRACTURE PROPERTIES
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
MATERIALS
MATRIX MATERIALS
MECHANICAL PROPERTIES
MINERALS
MONOCRYSTALS
MULLITE
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
QUANTITY RATIO
REINFORCED MATERIALS
SILICON CARBIDES
SILICON COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
WHISKERS
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES