Element Six Abrasives S.a.

Thembinkosi Shabalala

Nedret Can

Cornelis Roelof Jonker

David Christian Bowes

Kaveshini Naidoo

A PCD structure comprises a first region and a second region adjacent the first region, the second region being bonded to the first region by intergrowth of diamond grains; the first region comprising a plurality of alternating strata or layers, each stratum or layer having a thickness in the range of around 5 to 300 microns. The second region comprises a plurality of strata or layers, one or more strata or layers in the second region having a thickness greater than the thicknesses of the individual strata or layers in the first region. The alternating layers or strata in the first region comprise first layers or strata alternating with second layers or strata, the first layers or strata being in a state of residual compressive stress and the second layers or strata being in a state of residual tensile stress.

Polycrystalline diamond structure

A polycrystalline superhard construction comprises a body of polycrystalline superhard material, and a substrate of hard material bonded thereto along an interface. The body of polycrystalline superhard material comprises a first region abutting the substrate along the interface and a second region bonded to the first region. The second region defines a rake face, a cutting edge, a chamfer and at least a part of a flank face, the cutting edge being defined by an edge of the flank face joined to the chamfer, the chamfer extending between the cutting edge and the rake face. The height of the chamfer in a plane parallel to the plane through which the longitudinal axis of the polycrystalline superhard construction extends is less than the thickness of the second region. The first region comprises a material having coarser grains than the second region. There is also disclosed a method of making the same.

Polycrystalline superhard construction

A tip for a degradation tool, the tip comprising a PCD structure () joined to a cemented carbide substrate (); the PCD structure comprising a plurality of strata () arranged so that adjacent strata have alternating compressive and tensile stress states, adjacent strata comprising different PCD grades and being directly bonded to each other by inter-growth of diamond grains; each stratum having a mean thickness of at most 500 microns; the PCD structure defining a working end including a rounded conical apex () having a radius of curvature of 1.3 mm to 4 mm.

Tip for degradation tool and tool comprising same

A pick tool for degrading asphalt or rock, comprising a PCD element; the PCD element comprising a PCD structure () bonded to a cemented carbide support body () at an interface; the PCD structure comprising a first region () and a second region () adjacent the first region, the second region bonded to the first region by intergrowth of diamond grains; the first region () comprising a plurality of alternating strata (), each stratum having a thickness in the range of about 30 to 300 microns; the second region comprising a plurality of strata (), one or more strata in the second region () having a thickness greater than the thicknesses of the individual strata in the first region (), wherein the alternating strata in the first region () comprise first strata alternating with second strata, the first strata being in a state of residual compressive stress and the second strata being in a state of residual tensile stress.

Pick tool

A polycrystalline diamond (PCD) materialcomprising at least 88 volume percent and at most 99 volume percent diamond grains, the mean diamond grain contiguity being greater than 60.5 percent. The PCD materialis particularly but not exclusively for use in boring into the earth.

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Springs, South Africa

Thembinkosi Shabalala