| 摘要 |
PROBLEM TO BE SOLVED: To provide a hard metal which has enhanced abrasion resistance and deformation resistance on the surface, while enhancing toughness thereof. SOLUTION: The hard metal 1 comprises WC grains 2 and a binder phase 3 which combine the WC grains 2. When a cross-section structure of the hard metal 1 is observed, WC grains 2a which show polygonal shapes and roundness with curvature radiuses of 50 nm or more at the corners are contained in the inner part of the hard metal so as to occupy 50% or more of the area of the whole WC grains 2, and a mean length of neck growing parts 4 among WC grains 2 is longer in the surface part than in the inner part of the hard metal 1. COPYRIGHT: (C)2008,JPO&INPIT
|
