Plastic and nonmetallic article shaping or treating: processes – Outside of mold sintering or vitrifying of shaped inorganic... – Producing silicon carbide containing product
Reexamination Certificate
2011-08-23
2011-08-23
Daniels, Matthew J (Department: 1741)
Plastic and nonmetallic article shaping or treating: processes
Outside of mold sintering or vitrifying of shaped inorganic...
Producing silicon carbide containing product
C501S154000
Reexamination Certificate
active
08003042
ABSTRACT:
Pressureless sintering of silicon carbide with fracture toughness in excess of about 4 MPa-m1/2as measured by the single-edge precracked beam (SEPB) technique while maintaining a density greater than 3.1 g/cc for compositions with SiC greater than about 94 wt. % is made possible through the use of metallic Al to promote sintering and grain growth. Boron and carbon may be used as traditional sintering aids, with nitrogen to suppress grain growth, and additions of yttrium and/or lanthanide elements to promote intergranular fracture.
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Cutler Raymond Ashton
Flinders Roger Marc
Ray Darin
Ceramatec, Inc.
Daniels Matthew J
Fonda David
Kemmerle, III Russell J
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