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1. 发明授权

US5928976A Composite carbide powder used for cemented carbide and method of producing the same 失效
标题翻译：用于硬质合金的复合碳化物粉末及其制造方法
公开(公告)号：US5928976A
公开(公告)日：1999-07-27
申请号：US859228
申请日：1997-05-19
申请人： Yoshiharu Yamamoto , Nobuaki Asada , Yoshihiko Doi
发明人： Yoshiharu Yamamoto , Nobuaki Asada , Yoshihiko Doi
IPC分类号： B23B27/14 , B22F1/00 , C01B32/949 , C01B31/34
CPC分类号： C01B31/34 , C01P2004/61 , C01P2004/80 , C01P2006/80
摘要： In order to provide cemented carbide, provision is made about tungsten carbide powder which has a grain size not smaller than 1 .mu.m and which is mixed with carbon powder and chromium powder to form raw powder. The tungsten carbide powder is formed by fine primary crystal particles of tungsten carbide and satisfies an inequality given by:Y>0.61-0.33 log (X),where Y denotes a half-value width of (211) crystal planes in tungsten carbide (JCPDS-card 25-1047, d=0.9020) measured by a X-ray diffraction method and where X denotes a grain size measured by the FSSS method. There is also provided a method of producing the composite carbide powder having tungsten carbide powder as a main element, the method comprising the steps of preparing tungsten powder which has a mean grain size not smaller than 1 .mu.m, mixing the tungsten powder with carbon powder and chromium powder into a mixture, and processing the mixture in a predetermined atmosphere into fine primary crystal particles of tungsten carbide. One or more of the following additional components may be added to the mixture: Ta, Mo, Nb and Zr.
摘要翻译：为了提供硬质合金，对碳化钨粉末进行了规定，该碳化钨粉末的粒径不小于1μm，与碳粉和铬粉混合形成原料粉末。碳化钨粉末由碳化钨的微细的一次结晶粒子形成，满足由下式给出的不等式：Y> 0.61-0.33log（X），其中Y表示碳化钨中（211）晶面的半值宽度（JCPDS 卡25-1047，d = 0.9020），X表示通过FSSS法测定的晶粒尺寸。还提供了以碳化钨粉末为主要成分的复合碳化物粉末的制造方法，其特征在于，具有平均粒径为1μm以上的钨粉末，碳粉末和铬粉末混合成混合物，并将预定气氛中的混合物加工成碳化钨的细晶粒。可以向混合物中加入一种或多种以下附加组分：Ta，Mo，Nb和Zr。

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