A cutting element having an ultra hard material cutting layer and a method of manufacturing a cutting element having an ultra hard material cutting layer

摘要

A cutting element includes a substrate and a cutting layer disposed on a surface of the substrate. The cutting layer comprises an ultra hard material. The substrate comprises tungsten carbide and a metal binder. The substrate has a magnetic saturation value in the range of from 80 % to less than 85 %. In another aspect, the magnetic saturation value may increase within the substrate along a gradient, wherein proximal to the interface with the cutting layer, the substrate has a magnetic saturation value in the range of from 80 % to less than 85 %. Also included are drill bits incorporating such cutting elements. Also claimed is a method of manufacturing a cutting element where first and second batch of substrates are selected, where the substrates have a magnetic saturation which varies by at most 5%.