| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a cermet which has excellent chipping resistance and is suitable for the material of a cutting tool capable of cutting with which the excellent working surface quality of the material to be cut is obtained, and a coated cermet tool. <P>SOLUTION: The cermet is obtained in such a manner that a hard phase composed of a compound of the carbonitride of the group 4, 5, 6 metals in the periodic table is bound by a binder phase essentially composed of an iron group metal. The cermet provided with four kinds of grains with different compositions and forms as a hard phase has excellent chipping resistance and welding resistance while having high wear resistance, and with the cermet, satisfactory working surface quality can be obtained. The first hard phase 1 is constituted of the single phase grains of Ti(C, N); the second hard phase 2 is constituted of cored grains having core part 2a constituted of Ti(C, N) and a peripheral part 2b covering the whole of the core part 2a; the third hard phase 3 is constituted of cored grains constituted of composite carbonitride solid solution including Ti, W, and having the W concentration at a core part 3a higher than that of a peripheral part 3b; and fourth hard phase 4 is constituted of single phase grains composed of a composite carbonitride solid solution including Ti, W. <P>COPYRIGHT: (C)2012,JPO&INPIT |
