Plastic and nonmetallic article shaping or treating: processes – Outside of mold sintering or vitrifying of shaped inorganic... – Including plural heating steps
Patent
1998-12-16
2000-12-19
Derrington, James
Plastic and nonmetallic article shaping or treating: processes
Outside of mold sintering or vitrifying of shaped inorganic...
Including plural heating steps
264657, 264653, 264669, 264663, 264665, B28B 100
Patent
active
061623865
ABSTRACT:
The present invention provides a silicon nitride sintered body having characteristics such as excellent wear resistance, a method for manufacturing the sintered body, and a cutting insert formed thereof. The silicon nitride sintered body is formed of a polycrystalline sintered body of predominantly .beta.-Si.sub.3 N.sub.4, wherein the oxygen content is 1.2-1.5 wt. %. The method for manufacturing the silicon nitride sintered body includes the following steps: adding an organic binder to a composition containing silicon nitride as an essential component and exhibiting a theoretical oxygen content of 2.0-3.0 wt. %; heating to remove the binder; introducing an oxygen-containing gas so as to control the carbon content to 0.10-0.60 wt. %; and sintering a resultant compact in an nitrogen atmosphere to control the oxygen content to 1.2-1.5 wt. %. The cutting insert of the present invention has excellent wear resistance.
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JP Hei-8(96)/503664--correpsonding--WO94/16023; DOP: (1996) Apr. 23.
JP HEI-4(92)/201003 and its abstract obtained from database of Derwent.
JP Hei-4(92)/357174 and its abstract obtained from database of Derwent. PCT International Application WO 94/16023; International Publication date Jul. 21, 1994; International Patent Classification C09C 1/68.
Derrington James
NGK Spark Plug Co. Ltd.
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