| 摘要 |
<p>A coating technique for forming on a disc-shaped tool a wear-resistant film capable of attaining high durability of such a tool is proposed in view of drawbacks inherent in the conventional tools of this kind with wear-resistant coating films. In the disc-shaped tool of the present invention composed essentially of a steel disc-shaped base plate having wear-resistant tips made of a cemented carbide, cermet or a wear-resistant cast alloy brazed thereto and a wear-resistant coating film formed by means of physical vapor deposition; wherein the coating is designed to be applied over a range, with respect to a diameter (D) of the base plate, of not less than 0.75 times the diameter (D). The coating may be applied over a wider range of not less than 0.85 times the diameter (D). Here, the wear-resistant film is based on a film-forming material selected from titanium carbide (TiC), titanium carbide nitride (Ti-C-N) having a C/N atomic ratio of more than 0.5 and titanium aluminum nitride (Ti-Al-N). <IMAGE></p> |
