Cermet and coated cermet

摘要

A cermet has a hard phase which contains W and nitrogen, and includes at least one selected from a carbide, nitride and carbonitride of a metal having Ti as a main component, and a binder phase having an iron group metal as a main component. A W amount contained in the whole cermet is 5 to 40% by weight, an interfacial phase including a complex carbonitride with a larger W amount than a W amount of the hard phase being present between grains of the hard phase, and when a W amount contained in the interfacial phase based on the whole metal element is represented by Wb (atomic %), and a W amount contained in the hard phase based on the whole metal element is represented by Wh (atomic %), then, an atomic ratio of Wb to Wh (Wb/Wh) is 1.7 or more. The cermet is excellent in fracture resistance and wear resistance.

主权项

1. A cermet which comprises:
a hard phase which contains W and nitrogen, and comprises at least one selected from a carbide, nitride and carbonitride of a metal comprising Ti as a main component, a binder phase comprising an iron group metal as a main component, the binder phase is a material in which one or more elements of Group 4, 5 or 6 of the Periodic Table is dissolved in an iron group metal in a total amount of 18% or more by weight and 32% or less by weight, and an interfacial phase comprising a complex carbonitride with a larger W amount than a W amount of the hard phase, the interfacial phase being present between grains of the hard phase, wherein a W amount contained in the whole cermet is 5 to 40% by weight, and when a W amount contained in the interfacial phase based on the whole metal element is represented by Wb (atomic %), and a W amount contained in the hard phase based on the whole metal element is represented by Wh (atomic %), an atomic ratio of Wb to Wh (Wb/Wh) is 1.7 or more.