| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a cemented carbide in which the bias of particle size distribution of hard phase particles is less than that of conventional one. <P>SOLUTION: In the cemented carbide, hard phases mainly composed of WC particles are bound by binder phases mainly composed of Co. The average particle size of the WC particles composing the hard phase of the cemented carbide is <0.4 μm, and the degree of dispersion, which is an index of size uniformity of the WC particles, is ≤0.55. Here, the degree of dispersion is a value obtained by dividing the half width of the particle size distribution of the WC particles ((circle-equivalent diameter when the cumulative frequency is 75%)-(circle-equivalent diameter when the cumulative frequency is 25%)) by the average particle size of the WC particles (50% particle size). The cemented carbide thus obtained is superior to conventional one in wear resistance and chipping resistance and therefore can be suitably used for various working tools. <P>COPYRIGHT: (C)2012,JPO&INPIT |
