| 摘要 |
<p>The present invention is to provide a cermet which comprises a first hard phase comprising WC, a second hard phase comprising at least one selected from a carbide, nitride and carbonitride of an element(s) of groups 4, 5 and 6 of the Periodic Table including a titanium element, and a mutual solid solution thereof, and a binder phase mainly comprising an iron-group metal, wherein a carbon amount C T (% by weight) contained in a whole cermet, a tungsten amount C w (% by weight) contained in the whole cermet, and a nitrogen amount C N (% by weight) contained in the whole cermet satisfy 0.25<(C N /(C T -0.0653·C W ))<6, the cermet is formed by a surface area having a thickness of 5 to 100 µm and comprising the first hard phase and the binder phase, and an inner area existing at an inner area than the surface area and comprising the first hard phase, the second hard phase and the binder phase, and a ratio of an area ratio of the first hard phase to an area ratio of the second hard phase at the cross-section structure of the inner area of the cermet is 0.15 to 4.</p> |
