Plastic and nonmetallic article shaping or treating: processes – Outside of mold sintering or vitrifying of shaped inorganic... – Utilizing binder to add green strength to preform
Reexamination Certificate
2011-04-05
2011-04-05
Daniels, Matthew J (Department: 1741)
Plastic and nonmetallic article shaping or treating: processes
Outside of mold sintering or vitrifying of shaped inorganic...
Utilizing binder to add green strength to preform
Reexamination Certificate
active
07919040
ABSTRACT:
In a method of preparing a boron carbide material, boron carbide powder is washed with essentially pure water at an elevated temperature to generate washed boron carbide powder. The washed boron carbide powder is combined with a sintering aid. The mixture of the boron carbide powder and the sintering aid is pressed to form a shaped material, and the shaped material is sintered. A sintered boron carbide material comprises a boron carbide component that includes boron carbide, elemental carbon, and not more than about 0.6 wt % of oxygen on the basis of the total weight of the boron carbide component. The sintered boron carbide material has a density of at least about 99% of the theoretical density. Another sintered boron carbide material comprises a boron carbide component that includes boron carbide, silicon carbide, elemental carbon, and not more than about 0.3 wt % oxygen on the basis of the total weight of the boron carbide component, and has a density of at least about 97% of the theoretical density.
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Collins William T.
Hennessey James T.
Pujari Vimal K.
Daniels Matthew J
Hamilton Brook Smith & Reynolds P.C.
Kemmerle, III Russell J
Saint-Gobain Ceramics & Plastics, Inc.
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