Plastic and nonmetallic article shaping or treating: processes – Outside of mold sintering or vitrifying of shaped inorganic... – With article cutting – punching or grinding
Reexamination Certificate
2005-04-26
2005-04-26
Group, Karl (Department: 1755)
Plastic and nonmetallic article shaping or treating: processes
Outside of mold sintering or vitrifying of shaped inorganic...
With article cutting, punching or grinding
C501S127000, C501S097100, C451S038000, C451S039000, C451S041000
Reexamination Certificate
active
06884386
ABSTRACT:
When a sintered body of ceramic is shot-blasted at normal temperatures to plastically deform the crystal structure of the shot-blasted surface to apply residual stress and is heat-treated to recrystallize fine cracks, dislocated cells in the grain boundary are formed, crystals are finely divided, and the fracture toughness is significantly improved. When the sintered body of ceramic is a thin product, an effective toughening can be attained by shot blasting both the front and back sides. After heat treatment, mechanical strength is significantly improved by removing a part of the modified surface layer by an abrasion treatment.
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Morimitsu Hideki
Saka Hiroyasu
Uchimura Syoji
Finnegan Henderson Farabow Garrett & Dunner L.L.P.
Group Karl
Saka Hiroyasu
Sinto V-Cerax, Ltd.
Sintokogio Ltd.
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