| 摘要 |
The invention provides a multilayer gradient functional composite diamond sintered body. In a structure that a plurality of middle layers are arranged between a polycrystalline diamond sintered body (PCD) at the outermost layer and a cemented carbide substrate, the middle layers comprises diamond particles, cBN particles and metal binders; the metal binders are any one of Co, Ni and Fe and alloys thereof as a first group of component, any one of Cr, V, Mo and alloys thereof as a second group of component, and any one of Al and Mg and alloys thereof as a third group of component; the metal binders of the middle layers must contain the components of the first, second and third groups; in the layer containing the high-percentage diamond particles, a percentage of the contained first group of the component is higher than percentages of the contained second and third groups of the component; and, in the layer containing the cBN particles a percentage of which is higher than a percentage of a contained diamond particles, a percentage of the contained second group of the component is higher than percentages of the contained first and third groups of the components. |
