Process for making a titanium diboride-chromium diboride-yttrium titanium oxide ceramic composition

Patent · Wed Jan 01 04:00:00 EST 1992

OSTI ID:868260

Holcombe, Cressie E ^[1]; Dykes, Norman L ^[2]

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1. Knoxville, TN
2. Oak Ridge, TN

A ceramic composition composition is described. The ceramic composition consists essentially of from about 84 to 96 w/o titanium diboride, from about 1 to 9 w/o chromium diboride, and from about 3 to aobut 15 w/o yttrium-titanium-oxide. A method of making the ceramic composition is also described. The method of making the ceramic composition comprises the following steps: Step 1--A consolidated body containing stoichiometric quantities of titanium diboride and chromium diboride is provided. Step 2--The consolidated body is enclosed in and in contact with a thermally insulated package of yttria granules having a thickness of at least 0.5 inches. Step 3--The consolidated body enclosed in the thermally insulated package of yttria granules is heated in a microwave oven with microwave energy to a temperature equal to or greater than 1,900 degrees centigrade to sinter and uniformly disperse yttria particles having a size range from about 1 to about 12 microns throughout the consolidated body forming a densified body consisting essentially of titanium diboride, chromium diboride, and yttrium-titanium-oxide. The resulting densified body has enhanced fracture toughness and hardness.

• Research Organization: LOCKHEED MARTIN ENRGY SYST INC
• DOE Contract Number: AC05-84OR21400
• Assignee: Martin Marietta Energy Systems, Inc. (Oak Ridge, TN)
• Patent Number(s): US 5108670
• OSTI ID: 868260
• Country of Publication: United States
• Language: English

Related Subjects

/264/219/501/
1--a
12
15
2--the
3--the
84
900
96
aobut
centigrade
ceramic
ceramic composition
chromium
chromium diboride
composition
composition comprises
composition consists
comprises
consisting
consisting essentially
consists
consists essentially
consolidated
contact
containing
degrees
degrees centigrade
densified
described
diboride
diboride-chromium
diboride-chromium diboride-yttrium
diboride-yttrium
diboride-yttrium titanium
disperse
enclosed
energy
enhanced
equal
essentially
following
following steps
forming
fracture
fracture toughness
granules
hardness
heated
inches
insulated
method
microns
microwave
microwave energy
microwave oven
oven
oxide
oxide ceramic
package
particles
process
provided
quantities
range
resulting
sinter
size
size range
step
steps
stoichiometric
stoichiometric quantities
temperature
temperature equal
thermally
thermally insulated
thickness
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titanium
titanium diboride
titanium diboride-chromium
titanium oxide
toughness
uniformly
uniformly disperse
wave energy
yttria
yttrium-titanium-oxide