| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a cemented carbide having high toughness and strength and having excellent chipping resistance and breaking resistance, to provide a method of manufacturing the same, and to provide a micro drill. <P>SOLUTION: The cemented carbide has a hard phase mainly composed of WC particles and a bonded phase mainly composed of Co. Then, the hard phase is formed by a solid solution of Cr in the WC particles, and the average particle diameter of the WC particles is 0.5 μm or smaller. Furthermore, in the local structure of a Cr atom by an X-ray absorption spectrum method, the Cr atom is bonded to a W atom, and the ratio of (number of the W atoms/änumber of the Cr atoms+number of Co atoms}) obtained by dividing the number of the W atoms present within 300 pm from the Cr atom by the sum of the number of the Cr atoms and the number of the Co atoms present within 300 pm from the Cr atom is 0.3 or larger. <P>COPYRIGHT: (C)2012,JPO&INPIT |
