SURFACE-COATED TOOL AND METHOD OF WORKING CUTTING OBJECT

摘要

A surface-coated tool comprising a substratum and, superimposed on the surface thereof, a coating layer containing Ti and W in the form of nitrides or carbonitrides. The coating layer comprises a matrix and, dispersed therein, particles. The W content of the dispersed particles is greater than that of the matrix, and the difference in W content between the matrix and the dispersed particles is greater than that in the content of other component. A cutting tool with cutting blade consisting of this surface-coated tool is prepared. The cutting blade of the cutting tool is brought into contact with a cutting object and cutting work of the cutting object is performed by the cutting tool.