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Title: Method for preparing configured silicon carbide whisker-reinforced alumina ceramic articles

Abstract

A method is described for fabricating articles from silicon carbide whiskers and ceramic powder mixtures, comprising the steps of forming a homogeneous mixture of about 5 to 10 vol. % silicon carbide whiskers having a monocrystalline structure and dimensions of about 0.6 micrometer in diameter and about 10 to 80 micrometers in length, about 0.5 to 5.0 wt. % yttria. The balance alumina particulates are of an average particle size up to about 1 micrometer; shaping the mixture at a pressed density of at least about 50% of theoretical density; heating the mixture at essentially atmospheric pressure in an inert atmosphere to a temperature adequate to effect liquid-phase sintering of the ceramic particulates to provide a self-supporting composite formed of a ceramic matrix and silicon carbide whiskers dispersed therein with a density of at least about 94% of theoretical density for the combined composite constituents; and thereafter isostatically hot pressing the self-supporting composite at a pressure and temperature adequate to increase the density of the composite to provide an article of at least about 98% of theoretical density.

Inventors:
Publication Date:
OSTI Identifier:
6616392
Patent Number(s):
US 4652413
Assignee:
Dept. of Energy, Washington, DC
Resource Type:
Patent
Resource Relation:
Patent File Date: Filed date 16 Oct 1985
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ALUMINIUM OXIDES; CHEMICAL PREPARATION; CERAMICS; SILICON CARBIDES; ATMOSPHERIC PRESSURE; DENSITY; INERT ATMOSPHERE; MIXTURES; MONOCRYSTALS; PARTICLE SIZE; PARTICULATES; POWDERS; QUANTITY RATIO; REINFORCED MATERIALS; SHAPE; SINTERING; WHISKERS; YTTRIUM OXIDES; ALUMINIUM COMPOUNDS; CARBIDES; CARBON COMPOUNDS; CHALCOGENIDES; CRYSTALS; DISPERSIONS; FABRICATION; MATERIALS; OXIDES; OXYGEN COMPOUNDS; PARTICLES; PHYSICAL PROPERTIES; SILICON COMPOUNDS; SIZE; SYNTHESIS; TRANSITION ELEMENT COMPOUNDS; YTTRIUM COMPOUNDS; 360201* - Ceramics, Cermets, & Refractories- Preparation & Fabrication

Citation Formats

Tiegs, T N. Method for preparing configured silicon carbide whisker-reinforced alumina ceramic articles. United States: N. p., 1987. Web.
Tiegs, T N. Method for preparing configured silicon carbide whisker-reinforced alumina ceramic articles. United States.
Tiegs, T N. Tue . "Method for preparing configured silicon carbide whisker-reinforced alumina ceramic articles". United States.
@article{osti_6616392,
title = {Method for preparing configured silicon carbide whisker-reinforced alumina ceramic articles},
author = {Tiegs, T N},
abstractNote = {A method is described for fabricating articles from silicon carbide whiskers and ceramic powder mixtures, comprising the steps of forming a homogeneous mixture of about 5 to 10 vol. % silicon carbide whiskers having a monocrystalline structure and dimensions of about 0.6 micrometer in diameter and about 10 to 80 micrometers in length, about 0.5 to 5.0 wt. % yttria. The balance alumina particulates are of an average particle size up to about 1 micrometer; shaping the mixture at a pressed density of at least about 50% of theoretical density; heating the mixture at essentially atmospheric pressure in an inert atmosphere to a temperature adequate to effect liquid-phase sintering of the ceramic particulates to provide a self-supporting composite formed of a ceramic matrix and silicon carbide whiskers dispersed therein with a density of at least about 94% of theoretical density for the combined composite constituents; and thereafter isostatically hot pressing the self-supporting composite at a pressure and temperature adequate to increase the density of the composite to provide an article of at least about 98% of theoretical density.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1987},
month = {3}
}