Abstract: A superhard construction comprises a substrate comprising a peripheral surface, an interface surface and a longitudinal axis and a super hard material layer formed over the substrate and having an exposed outer surface forming a working surface, a peripheral surface extending therefrom and an interface surface. One of the interface surface of the substrate or the interface surface of the super hard material layer comprises one or more projections arranged to project from the interface surface, the height of the one or more projections being between around 0.2 mm to around 1.0 mm measured from the lowest point on the interface surface from which the one or more projections extend.

Abstract: A superhard construction comprises a substrate comprising a peripheral surface, an interface surface and a longitudinal axis and a super hard material layer formed over the substrate and having an exposed outer surface forming a working surface, a peripheral surface extending therefrom and an interface surface. One of the interface surface of the substrate or the interface surface of the super hard material layer comprises one or more projections arranged to project from the interface surface, the height of the one or more projections being between around 0.2 mm to around 1.0 mm measured from the lowest point on the interface surface from which the one or more projections extend.

Abstract: A superhard construction comprises a substrate (10) comprising a peripheral surface, an interface surface (18) and a longitudinal axis and a super hard material layer (12) formed over the substrate and having an exposed outer surface forming a working surface (14), a peripheral surface extending therefrom and an interface surface. One of the interface surface of the substrate or the interface surface of the super hard material layer comprises one or more projections (24, 26) arranged to project from the interface surface, the height of the one or more projections being between around 0.2 mm to around 1.0 mm measured from the lowest point on the interface surface from which the one or more projections extend.

Abstract: A polycrystalline superhard construction comprises a body of polycrystalline superhard material having two or more layers. A first layer differs from a second layer in one or more characteristics. The body has a thickness of greater than around 1.8 mm. A substrate is bonded to at least one of said layers, and one of the interface surface of the substrate or the body comprises one or more projections arranged to project from the interface surface, the height of the projection(s) being between around 0.2 mm to around 2.0 mm measured from the lowest point on the interface surface from which the one or more projections extend. At least a portion of the body of superhard material is substantially free of a catalyst material for the superhard material, and forms a thermally stable region extending a depth of at least around 300 microns from the working surface of the body of superhard material.

Abstract: The invention is for a polycrystalfine diamond composite material comprising intergrown diamond particles and a binder phase, the binder phase comprising a tin-based intermetallic or ternary carbide compound formed with a metallic solvent/catalyst. The invention extends to a polycrystalline diamond abrasive compact comprising such a composite material and to a tool insert comprising such a diamond abrasive compact.

Abstract: The invention is for an ultrahard composite material comprising a diamond phase and a binder phase, the binder phase comprising a ternary carbide of the general formula Mx M?y C wherein; M is at least one metal selected from the group consisting of the transition metals and the rare earth metals, M? is a metal selected from the group consisting of the main group metals or metalloid elements and the transition metals Zn and Cd, x is from 2.5 to 5.0, y is from 0.5 to 3.0 and z is from 0.1 to 1. The invention extends to a diamond abrasive compact comprising such an ultrahard composite material and to a tool comprising such a diamond abrasive compact.