摘要 |
An insert for a drill bit may include a metallic carbide body; an outer layer of polycrystalline diamond material on the outermost end of the insert, the polycrystalline diamond material comprising a plurality of interconnected first diamond grains and a first binder material in interstitial regions between the interconnected first diamond grains; and at least two transition layers between the metallic carbide body and the outer layer, the at least two transition layers comprising: an outermost transition layer comprising a composite of second diamond grains, first metal carbide or carbonitride particles, and a second binder material; and an innermost transition layer comprising a composite of third diamond grains, second metal carbide or carbonitride particles, and a third binder material wherein a thickness of the outer layer is lesser than that of each of the at least two transition layers. |
申请人 |
SMITH INTERNATIONAL, INC.;MOURIK, NEPHI A.;CARIVEAU, PETER T.;STEWART, MICHAEL;BELLIN, FEDERICO;FANG, YI |
发明人 |
MOURIK, NEPHI A.;CARIVEAU, PETER T.;STEWART, MICHAEL;BELLIN, FEDERICO;FANG, YI |