DIAMOND COMPOSITE COATING, GRADED STRUCTURE ULTRAFINE HARD ALLOY CUTTING TOOL WITH THE COMPOSITE COATING, AND METHOD FOR MANUFACTURING SAME

摘要

A diamond composite coating, a graded structure ultrafine hard alloy cutting tool with the diamond composite coating, and a method for manufacturing same. The alloy cutting tool comprises a cutting tool base body and the diamond composite coating. The cutting tool base body is provided with a normal organization layer, a cobalt-rich transition layer, and a cobalt-poor cube-rich phase layer. The diamond composite coating comprises a Ti-Al-Si-Cr alloy layer as a transition layer and a diamond layer as a functional layer. The cutting tool base body of the graded structure ultrafine hard alloy cutting tool with the diamond composite coating disclosed in the invention exhibits good adhesion to the diamond composite coating. The entire cutting tool has good resistance against abrasion and high temperature, high strength and excellent shock resistance. The diamond composite coating has good adhesion with the cutting tool base body, good layer-to-layer adhesion within the composite coating, and good resistance against high temperatures, corrosion, and abrasion.