| 摘要 |
<p>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 -Si3N4, 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. <IMAGE></p> |
