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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 disperson 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.degree. to 1950.degree. C. with pressing times varying from about 0.075 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:
 [1]
  1. (Oak Ridge, TN)
Issue Date:
Research Org.:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN
OSTI Identifier:
875293
Patent Number(s):
RE34446
Assignee:
Martin Marietta Energy Systems, Inc. (Oak Ridge, TN) ORNL
DOE Contract Number:  
W-7405-ENG-26
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
silicon; carbide; whisker; reinforced; ceramic; composites; method; directed; fabrication; possess; improved; mechanical; properties; especially; increased; fracture; toughness; formation; single; crystal; sic; whiskers; mixed; fine; powders; material; mullite; mixtures; contain; homogeneous; disperson; hot; pressed; pressures; range; 28; 70; mpa; temperatures; 1600; degree; 1950; pressing; times; varying; 075; hours; resulting; increase; represents; two-fold; matrix; ceramic powder; hot pressed; ceramic powders; improved mechanical; ceramic material; ceramic composites; matrix material; ceramic composite; fracture toughness; silicon carbide; mechanical properties; single crystal; sic whiskers; two-fold increase; pressing times; properties especially; resulting ceramic; reinforced ceramic; fine ceramic; whisker reinforced; increased fracture; times varying; hot press; carbide whisker; possess improved; especially increased; crystal sic; ceramic mater; /501/264/

Citation Formats

Wei, George C. Silicon carbide whisker reinforced ceramic composites and method for making same. United States: N. p., 1993. Web.
Wei, George C. Silicon carbide whisker reinforced ceramic composites and method for making same. United States.
Wei, George C. Fri . "Silicon carbide whisker reinforced ceramic composites and method for making same". United States. https://www.osti.gov/servlets/purl/875293.
@article{osti_875293,
title = {Silicon carbide whisker reinforced ceramic composites and method for making same},
author = {Wei, George 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 disperson 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.degree. to 1950.degree. C. with pressing times varying from about 0.075 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 = {1993},
month = {1}
}

Patent:

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