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Title: Silicon carbide whisker-zirconia reinforced mullite and alumina ceramics

Abstract

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.

Inventors:
;
Publication Date:
OSTI Identifier:
6561024
Patent Number(s):
US 4657877
Application Number:
TRN: 87-021667
Assignee:
Dept. of Energy, Washington, DC
Resource Type:
Patent
Resource Relation:
Patent File Date: Filed date 21 May 1986
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ALUMINIUM OXIDES; CRACK PROPAGATION; FLEXURAL STRENGTH; FRACTURE PROPERTIES; CERAMICS; MULLITE; SILICON CARBIDES; ZIRCONIUM OXIDES; COMPOSITE MATERIALS; MATRIX MATERIALS; MONOCRYSTALS; QUANTITY RATIO; REINFORCED MATERIALS; WHISKERS; ALUMINIUM COMPOUNDS; CARBIDES; CARBON COMPOUNDS; CHALCOGENIDES; CRYSTALS; INORGANIC ION EXCHANGERS; ION EXCHANGE MATERIALS; MATERIALS; MECHANICAL PROPERTIES; MINERALS; OXIDE MINERALS; OXIDES; OXYGEN COMPOUNDS; SILICON COMPOUNDS; TRANSITION ELEMENT COMPOUNDS; ZIRCONIUM COMPOUNDS; 360201* - Ceramics, Cermets, & Refractories- Preparation & Fabrication; 360203 - Ceramics, Cermets, & Refractories- Mechanical Properties

Citation Formats

Becher, P F, and Tiegs, T N. Silicon carbide whisker-zirconia reinforced mullite and alumina ceramics. United States: N. p., 1987. Web.
Becher, P F, & Tiegs, T N. Silicon carbide whisker-zirconia reinforced mullite and alumina ceramics. United States.
Becher, P F, and Tiegs, T N. Tue . "Silicon carbide whisker-zirconia reinforced mullite and alumina ceramics". United States.
@article{osti_6561024,
title = {Silicon carbide whisker-zirconia reinforced mullite and alumina ceramics},
author = {Becher, P F and Tiegs, T N},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1987},
month = {4}
}