Patent ID: 11389878

Abstract:
Disclosed is a TiN-based sintered body and a cutting tool made of the TiN-based sintered body, which has 70 to 94 area % of a TiN phase, 1 to 25 area % of a Mo2C phase, and a remainder including a binder phase. The binder phase contains Fe and Ni whose total area ratio is 5 to 15 area %, and an amount of Ni to a total amount of Fe and Ni is 15 to 35 mass %. When an X-ray diffraction profile is measured in the cross section of the TiN-based sintered body, the diffraction peaks of TiN, Mo2C and Fe—Ni having an fcc structure are present, but the diffraction peaks of Fe—Ni having a bcc structure, a Fe3Mo3C phase, and a Fe3Mo3N phase are absent. The lattice constant of the TiN is 4.235 to 4.245 Å, and that of the Fe—Ni having an fcc structure is 3.58 to 3.62 Å.