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 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: 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: Disclosed herein is a process and apparatus for safely distilling relatively small batches of organic compounds such as paint solvents by directly and safely heating the compounds in a vessel having a relatively thick bottom with electrical heating units cast in it and a relatively thick side wall integrally attached to the bottom. The side wall may be integrally attached to the bottom by a weld that penetrates the joint between the side wall and bottom preferably by 100% in order to provide a complete heat transfer from the bottom to the side wall. The vessel is so designed so as to provide a relatively uniform temperature throughout the inner periphery of the vessel thereby avoiding hot spots and insuring that the hottest spot of the inner periphery of the vessel does not exceed the auto ignition temperature of the compound being processed.