Importance

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Abstract

A super hard construction (1) comprises a substrate (30) and a super hard material layer (32) formed over the substrate. One of the interface surface (38) of the substrate or the interface surface of the super hard material layer comprises a plurality of spaced-apart projections (44, 46); the projections (44) being arranged in an annular discontinuous first array around the central longitudinal axis and spaced from the peripheral surface (40) of the substrate by a distance of between around 1 mm to around 1.5 mm A second annular discontinuous array of projections (46) is positioned radially within the first array. The projections in the second array are positioned to radially align with spaces between the projections in the first array, the interface surface between the projections being substantially planar; and the projections in the first array are of a greater height than the projections in the second array.

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First Claim