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

Abstract

A ceramic article of alumina reinforced with silicon carbide whiskers suitable for the fabrication into articles of complex geometry are provided by pressureless sintering and hot isostatic pressing steps. In accordance with the method of the invention a mixture of 5 to 10 vol. % silicon carbide whiskers 0.5 to 5 wt. % of a sintering aid such as yttria and the balance alumina powders is ball-milled and pressureless sintered in the desired configuration in the desired configuration an inert atmosphere at a temperature of about 1800.degree. C. to provide a self-supporting configured composite of a density of at least about 94% theoretical density. The composite is then hot isostatically pressed at a temperature and pressure adequate to provide configured articles of at least about 98% of theoretical density which is sufficient to provide the article with sufficient strength and fracture toughness for use in most structural applications such as gas turbine blades, cylinders, and other components of advanced heat engines.

Inventors:
 [1]
  1. (Lenoir City, TN)
Issue Date:
Research Org.:
LOCKHEED MARTIN ENRGY SYST INC
OSTI Identifier:
866191
Patent Number(s):
4652413
Assignee:
United States of America as represented by United States (Washington, DC) ORNL
DOE Contract Number:  
AC05-84OR21400
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
method; preparing; configured; silicon; carbide; whisker-reinforced; alumina; ceramic; articles; article; reinforced; whiskers; suitable; fabrication; complex; geometry; provided; pressureless; sintering; hot; isostatic; pressing; steps; accordance; mixture; 10; vol; wt; yttria; balance; powders; ball-milled; sintered; desired; configuration; inert; atmosphere; temperature; 1800; degree; provide; self-supporting; composite; density; 94; theoretical; isostatically; pressed; pressure; adequate; 98; sufficient; strength; fracture; toughness; structural; applications; gas; turbine; blades; cylinders; components; advanced; heat; engines; heat engines; hot isostatically; theoretical density; ceramic article; heat engine; turbine blade; fracture toughness; gas turbine; silicon carbide; inert atmosphere; hot isostatic; carbide whiskers; turbine blades; isostatic pressing; sufficient strength; pressureless sintering; isostatically pressed; ceramic articles; desired configuration; structural applications; alumina ceramic; carbide whisker; carbide whisker-reinforced; complex geometry; alumina powder; /264/501/

Citation Formats

Tiegs, Terry N. Method for preparing configured silicon carbide whisker-reinforced alumina ceramic articles. United States: N. p., 1987. Web.
Tiegs, Terry N. Method for preparing configured silicon carbide whisker-reinforced alumina ceramic articles. United States.
Tiegs, Terry N. Thu . "Method for preparing configured silicon carbide whisker-reinforced alumina ceramic articles". United States. https://www.osti.gov/servlets/purl/866191.
@article{osti_866191,
title = {Method for preparing configured silicon carbide whisker-reinforced alumina ceramic articles},
author = {Tiegs, Terry N.},
abstractNote = {A ceramic article of alumina reinforced with silicon carbide whiskers suitable for the fabrication into articles of complex geometry are provided by pressureless sintering and hot isostatic pressing steps. In accordance with the method of the invention a mixture of 5 to 10 vol. % silicon carbide whiskers 0.5 to 5 wt. % of a sintering aid such as yttria and the balance alumina powders is ball-milled and pressureless sintered in the desired configuration in the desired configuration an inert atmosphere at a temperature of about 1800.degree. C. to provide a self-supporting configured composite of a density of at least about 94% theoretical density. The composite is then hot isostatically pressed at a temperature and pressure adequate to provide configured articles of at least about 98% of theoretical density which is sufficient to provide the article with sufficient strength and fracture toughness for use in most structural applications such as gas turbine blades, cylinders, and other components of advanced heat engines.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1987},
month = {1}
}

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