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Title: Silicon carbide whisker reinforced 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 1600 to 1950/sup 0/C with pressing times varying from about 0.75 to 2.5 hours. The resulting ceramic composites show an increase in fracture toughness of up to about 9 MPa.m/sup 1/2/ which represents as much as a two-fold increase over that of the matrix material.

Inventors:
Publication Date:
OSTI Identifier:
6019159
Application Number:
ON: TI85005774
Assignee:
Dept. of Energy EDB-85-038317
DOE Contract Number:  
AC05-84OR21400
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; COMPOSITE MATERIALS; FABRICATION; REINFORCED MATERIALS; CERAMICS; FRACTURE PROPERTIES; HOT PRESSING; SILICON CARBIDES; WHISKERS; CARBIDES; CARBON COMPOUNDS; CRYSTALS; MATERIALS; MATERIALS WORKING; MECHANICAL PROPERTIES; MONOCRYSTALS; PRESSING; SILICON COMPOUNDS; 360301* - Composite Materials- Preparation & Fabrication- (-1987)

Citation Formats

Wei, G.C. Silicon carbide whisker reinforced composites and method for making same. United States: N. p., 1984. Web.
Wei, G.C. Silicon carbide whisker reinforced composites and method for making same. United States.
Wei, G.C. Thu . "Silicon carbide whisker reinforced composites and method for making same". United States.
@article{osti_6019159,
title = {Silicon carbide whisker reinforced 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 1600 to 1950/sup 0/C with pressing times varying from about 0.75 to 2.5 hours. The resulting ceramic composites show an increase in fracture toughness of up to about 9 MPa.m/sup 1/2/ which represents as much as a two-fold increase over that of the matrix material.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu Feb 09 00:00:00 EST 1984},
month = {Thu Feb 09 00:00:00 EST 1984}
}