Compositions: ceramic – Ceramic compositions – Refractory
Patent
1990-04-20
1991-05-07
Bell, Mark L.
Compositions: ceramic
Ceramic compositions
Refractory
501 96, 219 1055M, C04B 3558
Patent
active
050136941
ABSTRACT:
A ceramic 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 about 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.
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Dykes Norman L.
Holcombe Cressie E.
Bell Mark L.
Ericson Ivan L.
Green Anthony J.
Martin Marietta Energy Systems Inc.
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