公开(公告)号：US5668069A

公开(公告)日：1997-09-16

申请号：US655388

申请日：1996-05-30

申请人： Masahiro Sato ,  Yukiyasu Aoyama ,  Nobuoki Takagi ,  Shoji Kohsaka

发明人： Masahiro Sato ,  Yukiyasu Aoyama ,  Nobuoki Takagi ,  Shoji Kohsaka

IPC分类号： B23B27/14 ,  C04B35/584 ,  C04B35/593 ,  C04B35/587

CPC分类号： C04B35/5935 ,  Y10T407/27

摘要： A cutting tool composed of silicon nitride comprising chiefly a .beta.-silicon nitride crystal phase and containing a grain boundary phase of rare earth elements, silicon, aluminum, oxygen and nitrogen, wherein the cutting surface is constituted by at least a fired surface or a surface formed by removing and polishing the fired surface by an amount of not larger than 10 .mu.m, and has in the mirror surface thereof a micro-Vicker's hardness which is higher than that of the interior thereof and is not smaller than 16 GPa. The cutting tool has a cutting surface that can be easily worked enabling the cost of working to be decreased, and has a highly hard layer that is suited for cutting cast iron and the like materials featuring increased durability and extended cutting life.

摘要翻译： 一种由主要包含β-硅氮化物晶相并且含有稀土元素，硅，铝，氧和氮的晶界相的氮化硅组成的切削工具，其中切割表面至少由烧结表面或表面 通过将烧制表面除去和抛光不大于10μm而形成，并且其镜面具有高于其内部的微维氏硬度，并且不小于16GPa。 该切削工具具有能够容易地加工的切削面，能够降低加工成本，并且具有适用于切割铸铁的高硬度层，其具有增加的耐久性和延长的切削寿命的类似材料。