Being joined by the binder phase where

摘要

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 face quality of the material to be cut is obtained, and to provide a coated cermet tool.;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 consisting 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 which satisfactory working face quality can be obtained. The 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 a 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 a composite carbonitride solid solution including Ti, W, cored grains having the W concentration at a core part 3a higher than that of a peripheral part 3b, and the fourth hard phase 4 is constituted of single phase grains composed of a composite carbonitride solid solution including Ti.;COPYRIGHT: (C)2011,JPO&INPIT