Pressureless sintering of whisker-toughened ceramic composites

Tiegs, Terry N

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Title: Pressureless sintering of whisker-toughened ceramic composites

Abstract

A pressureless sintering method is disclosed for use in the production of whisker-toughened ceramic composites wherein the sintered density of composites containing up to about 20 vol. % SiC whiskers is improved by reducing the average aspect ratio of the whiskers to from about 10 to about 20. Sintering aids further improve the density, permitting the production of composites containing 20 vol. % SiC with sintered densities of 94% or better of theoretical density by a pressureless sintering method.

Inventors:

Tiegs, Terry N ^[1]

Lenoir City, TN

Issue Date:: 1993-01-01

Research Org.:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

OSTI Identifier:: 868766

Patent Number(s):: 5207958

Assignee:: Martin Marietta Energy Systems, Inc. (Oak Ridge, TN)

Patent Classifications (CPCs):: C - CHEMISTRY C04 - CEMENTS C04B - LIME, MAGNESIA

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C - CHEMISTRY C04 - CEMENTS C04B - LIME, MAGNESIA
C04B35/111 - Fine ceramics
C04B35/64 - Burning or sintering processes
C04B35/80 - Fibres, filaments, whiskers, platelets, or the like {

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DOE Contract Number:: AC05-84OR21400

Resource Type:: Patent

Country of Publication:: United States

Language:: English

Subject:: pressureless; sintering; whisker-toughened; ceramic; composites; method; disclosed; production; sintered; density; containing; 20; vol; sic; whiskers; improved; reducing; average; aspect; ratio; 10; aids; improve; permitting; densities; 94; theoretical; theoretical density; ceramic composites; ceramic composite; aspect ratio; pressureless sintering; composites containing; sic whiskers; whisker-toughened ceramic; sintering aids; sintering method; sintered density; toughened ceramic; /264/501/

Citation Formats


                    Tiegs, Terry N. Pressureless sintering of whisker-toughened ceramic composites.  United States: N. p., 1993. 
        Web.

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                    Tiegs, Terry N. Pressureless sintering of whisker-toughened ceramic composites.  United States.

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                    Tiegs, Terry N. Fri .  
        "Pressureless sintering of whisker-toughened ceramic composites".  United States.  https://www.osti.gov/servlets/purl/868766.

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@article{osti_868766,

  title        = {Pressureless sintering of whisker-toughened ceramic composites},

  author       = {Tiegs, Terry N},

  abstractNote = {A pressureless sintering method is disclosed for use in the production of whisker-toughened ceramic composites wherein the sintered density of composites containing up to about 20 vol. % SiC whiskers is improved by reducing the average aspect ratio of the whiskers to from about 10 to about 20. Sintering aids further improve the density, permitting the production of composites containing 20 vol. % SiC with sintered densities of 94% or better of theoretical density by a pressureless sintering method.},

  doi          = {},

  journal      = {},
number       = ,

  volume       = ,

  place        = {United States},

  year         = {1993},

  month        = {1}

}

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Works referenced in this record:

Processing of pressureless-sintered SiC whisker-reinforced Al2O3 composites
journal, December 1987

Barclay, S. J.; Fox, J. R.; Bowen, H. K.
Journal of Materials Science, Vol. 22, Issue 12
https://doi.org/10.1007/BF01132037

Suspension Processing of Al2O3/SiC Whisker Composites
journal, May 1988

Sacks, Michael D.; Lee, Hae-Weon; Rojas, Oswaldo E.
Journal of the American Ceramic Society, Vol. 71, Issue 5
https://doi.org/10.1111/j.1151-2916.1988.tb05056.x

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Pressureless sintering of whiskered-toughened ceramic composites

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A pressureless sintering method is disclosed for use in the production of whisker-toughened ceramic composites wherein the sintered density of composites containing up to about 20 vol. % SiC whiskers is improved by reducing the average aspect ratio of the whiskers to from about 10 to about 20. Sintering aids further improve the density, permitting the production of composites containing 20 vol. % SiC with sintered densities of 94% or better of theoretical density by a pressureless sintering method.
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A pressureless sintering method is disclosed for use in the production of whisker-toughened ceramic composites wherein the sintered density of composites containing up to about 20 vol. % SiC whiskers is improved by reducing the average aspect ratio of the whiskers to from about 10 to about 20. Sintering aids further improve the density, permitting the production of composites containing 20 vol. % SiC with sintered densities of 94% or better of theoretical density by a pressureless sintering method.
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Patent Tiegs, T N

A pressureless sintering method is disclosed for use in the production of whisker-toughened ceramic composites wherein the sintered density of composites containing up to about 20 vol. % SiC whiskers is improved by reducing the average aspect ratio of the whiskers to from about 10 to about 20. Sintering aids further improve the density, permitting the production of composites containing 20 vol. % SiC with sintered densities of 94% or better of theoretical density by a pressureless sintering method. 6 figures.
Ceramic composites reinforced with modified silicon carbide whiskers and method for modifying the whiskers

Patent Tiegs, Terry N [Lenoir City, TN]; Lindemer, Terrence B [Oak Ridge, TN]

Silicon carbide whisker-reinforced ceramic composites are fabricated in a highly reproducible manner by beneficating the surfaces of the silicon carbide whiskers prior to their usage in the ceramic composites. The silicon carbide whiskers which contain considerable concentrations of surface oxides and other impurities which interact with the ceramic composite material to form a chemical bond are significantly reduced so that only a relatively weak chemical bond is formed between the whisker and the ceramic material. Thus, when the whiskers interact with a crack propagating into the composite the crack is diverted or deflected along the whisker-matrix interface due to themore » « less
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Similar Records

Title: Pressureless sintering of whisker-toughened ceramic composites

Abstract

Citation Formats

Processing of pressureless-sintered SiC whisker-reinforced Al2O3 composites journal, December 1987

Suspension Processing of Al2O3/SiC Whisker Composites journal, May 1988

Processing of pressureless-sintered SiC whisker-reinforced Al2O3 composites
journal, December 1987

Suspension Processing of Al2O3/SiC Whisker Composites
journal, May 1988