公开(公告)号：US5009705A

公开(公告)日：1991-04-23

申请号：US458099

申请日：1989-12-28

申请人： Hironori Yoshimura ,  Inada Shyogo

发明人： Hironori Yoshimura ,  Inada Shyogo

IPC分类号： C22C29/08

CPC分类号： C22C29/08 ,  Y10T407/27 ,  Y10T428/12056 ,  Y10T428/31678

摘要： A microdrill bit is made of a tungsten carbide based cemented carbide which contains a binder phase of 6% by weight to 14% by weight of a cobalt alloy and a hard dispersed phase of balance tungsten carbide. The cobalt alloy contains cobalt, chromium, vanadium and tungsten and has weight ratios so as to satisfy the relationships of 0.04.ltoreq.(c+d)/(a+b+c+d).ltoreq.0.10 and 0.50.ltoreq.c/(c+d).ltoreq.0.95, where a, b, c and d denote weight ratios of tungsten, cobalt, chromium and vanadium, respectively. The drill bit is formed so as to have a Rockwell A scale hardness of 92.0 to 94.0.

摘要翻译： 微钻头由碳化钨基硬质合金制成，其包含6重量％至14重量％的钴合金和硬分散相的平衡碳化钨的粘结相。 钴合金含有钴，铬，钒和钨，其重量比为满足0.04