TRIPLE LAYER CUTTING COMPOSITE FORMED BY A HARD METAL SUBSTRATE AND SINTERED DIAMOND BODY UNITED THROUGH AN INTERFACE

摘要

"triple layer cutting composite formed by a carbide substrate and a sintered diamond body joined through an interface". The present invention is in the field of powder metallurgy material processing, more specifically, the production of super high hardness materials with sintered cutting body with three different layers. the substrate comprises the wc cemented with a cobalt binder, the interface being a wc cemented with a mixed nickel and niobium binder, and the top is a sintered diamond body with a niobium binder. The smaller and more uniform residual stresses are established by the very uniform thin layer of carbide bonded to the carbide substrate through an interface with composition close to the sintered diamond body and the substrate, improving the adhesion of the interface between the layers. A new pure niobium binder is also used to improve the properties of the diamond layer, and as the interface also contains niobium, it may exhibit better adhesion.