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Title: Silicon carbide whisker reinforced ceramic composites and method for making same

Abstract

The present invention is directed to the fabrication of ceramic composites which possess improved mechanical properties especially increased fracture toughness. In the formation of these ceramic composites, the single crystal SiC whiskers are mixed with fine ceramic powders of a ceramic material such as Al{sub 2}O{sub 3}, mullite, or B{sub 4}C. The mixtures which contain a homogeneous dispersion of the SiC whiskers are hot pressed at pressures in a range of about 28 to 70 MPa and temperatures in the range of about 1,600 to 1,950 C with pressing times varying from about 0.75 to 2.5 hours. The resulting ceramic composites show an increase in fracture toughness which represents as much as a two-fold increase over that of the matrix material.

Inventors:
Issue Date:
Research Org.:
Union Carbide Corporation
OSTI Identifier:
27688
Patent Number(s):
32,843/E/
Application Number:
PAN: 6-847,961
Assignee:
Martin Marietta Energy Systems, Inc., Oak Ridge, TN (United States) PTO; SCA: 360601; 360603; PA: EDB-95:058115; SN: 94001276559
DOE Contract Number:  
W-7405-ENG-26
Resource Type:
Patent
Resource Relation:
Other Information: DN: Reissue of US Pat. No. 4,543,345, which was issued Sep. 24, 1985; PBD: 24 Jan 1989
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; COMPOSITE MATERIALS; FABRICATION; FRACTURE PROPERTIES; SILICON CARBIDES; ALUMINIUM OXIDES; MULLITE; BORON CARBIDES

Citation Formats

Wei, G.C. Silicon carbide whisker reinforced ceramic composites and method for making same. United States: N. p., 1989. Web.
Wei, G.C. Silicon carbide whisker reinforced ceramic composites and method for making same. United States.
Wei, G.C. Tue . "Silicon carbide whisker reinforced ceramic composites and method for making same". United States.
@article{osti_27688,
title = {Silicon carbide whisker reinforced ceramic composites and method for making same},
author = {Wei, G.C.},
abstractNote = {The present invention is directed to the fabrication of ceramic composites which possess improved mechanical properties especially increased fracture toughness. In the formation of these ceramic composites, the single crystal SiC whiskers are mixed with fine ceramic powders of a ceramic material such as Al{sub 2}O{sub 3}, mullite, or B{sub 4}C. The mixtures which contain a homogeneous dispersion of the SiC whiskers are hot pressed at pressures in a range of about 28 to 70 MPa and temperatures in the range of about 1,600 to 1,950 C with pressing times varying from about 0.75 to 2.5 hours. The resulting ceramic composites show an increase in fracture toughness which represents as much as a two-fold increase over that of the matrix material.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1989},
month = {1}
}