Dispersion toughened ceramic composites and method for making same

Patent · Wed Jan 01 00:00:00 EST 1986

OSTI ID:865906

Stinton, David P ^[1]; Lackey, Walter J ^[2]; Lauf, Robert J ^[2]

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1. Knoxville, TN
2. Oak Ridge, TN

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.

• Research Organization: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
• DOE Contract Number: W-7405-ENG-26
• Assignee: United States of America as represented by United States (Washington, DC)
• Patent Number(s): US 4598024
• OSTI ID: 865906
• Country of Publication: United States
• Language: English

Related Subjects

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
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