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Title: Dispersion toughened ceramic composites and method for making same

Abstract

Ceramic composites exhibiting increased fracture toughness are produced by the simultaneous codeposition of silicon carbide and titanium disilicide by chemical vapor deposition. A mixture of hydrogen, methyltrichlorosilane and titanium tetrachloride is introduced into a furnace containing a substrate such as graphite or silicon carbide. The thermal decomposition of the methyltrichlorosilane provides a silicon carbide matrix phase and the decomposition of the titanium tetrachloride provides a uniformly dispersed second phase of the intermetallic titanium disilicide within the matrix phase. The fracture toughness of the ceramic composite is in the range of about 6.5 to 7.0 MPa.sqroot.m which represents a significant increase over that of silicon carbide.

Inventors:
 [1];  [2];  [2]
  1. Knoxville, TN
  2. Oak Ridge, TN
Issue Date:
Research Org.:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN
OSTI Identifier:
865906
Patent Number(s):
4598024
Assignee:
United States of America as represented by United States (Washington, DC)
DOE Contract Number:  
W-7405-ENG-26
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
dispersion; toughened; ceramic; composites; method; exhibiting; increased; fracture; toughness; produced; simultaneous; codeposition; silicon; carbide; titanium; disilicide; chemical; vapor; deposition; mixture; hydrogen; methyltrichlorosilane; tetrachloride; introduced; furnace; containing; substrate; graphite; thermal; decomposition; provides; matrix; phase; uniformly; dispersed; intermetallic; composite; range; mpa; sqroot; represents; significant; increase; significant increase; matrix phase; carbide matrix; thermal decomposition; ceramic composites; ceramic composite; fracture toughness; chemical vapor; silicon carbide; vapor deposition; uniformly dispersed; increased fracture; uniformly disperse; toughened ceramic; /428/427/

Citation Formats

Stinton, David P, Lackey, Walter J, and Lauf, Robert J. Dispersion toughened ceramic composites and method for making same. United States: N. p., 1986. Web.
Stinton, David P, Lackey, Walter J, & Lauf, Robert J. Dispersion toughened ceramic composites and method for making same. United States.
Stinton, David P, Lackey, Walter J, and Lauf, Robert J. Wed . "Dispersion toughened ceramic composites and method for making same". United States. https://www.osti.gov/servlets/purl/865906.
@article{osti_865906,
title = {Dispersion toughened ceramic composites and method for making same},
author = {Stinton, David P and Lackey, Walter J and Lauf, Robert J},
abstractNote = {Ceramic composites exhibiting increased fracture toughness are produced by the simultaneous codeposition of silicon carbide and titanium disilicide by chemical vapor deposition. A mixture of hydrogen, methyltrichlorosilane and titanium tetrachloride is introduced into a furnace containing a substrate such as graphite or silicon carbide. The thermal decomposition of the methyltrichlorosilane provides a silicon carbide matrix phase and the decomposition of the titanium tetrachloride provides a uniformly dispersed second phase of the intermetallic titanium disilicide within the matrix phase. The fracture toughness of the ceramic composite is in the range of about 6.5 to 7.0 MPa.sqroot.m which represents a significant increase over that of silicon carbide.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1986},
month = {1}
}

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