Element Six Technologies Limited

Benjamin Wickham

Ian Friel

Andrew Michael Bennett

A non-planar chemical vapour deposition polycrystalline diamond body has a dome body having an apex and an outer periphery. The dome body has an average radius of curvature in a range of 4 mm to 25 mm and a maximum linear dimension at the outer periphery of the dome body of no more than 26 mm. The average radius of curvature is no less than 0.6 times the maximum linear dimension at the outer periphery. A method of fabricating the non-planar diamond body is also disclosed.

Non-planar polycrystalline diamond body

A poly crystalline chemical vapour deposited (CVD) diamond wafer comprising: &#x2014;a diameter &#x3e;40 mm; &#x2014;a thickness &#x3e;1.0 mm; &#x2014;an absorption coefficient &#x2264;0.1 cmat 10.6 &#x3bc;m; and &#x22c5;a micro feature density, especially in the form of 'black spots', meeting the following specification: &#x2014;in a central area of the polycrystalline CVD diamond wafer from 0 to 20 mm radius there are no more than 100 micro features of a size between 0.002 and 0.008 mm, no more than 50 micro features of a size between 0.008 and 0.018 mm, no more than 25 microfeatures of a size between 0.018 and 0.05 mm, and zero microfeatures of a size between 0.05 and 0.1 mm, and &#x22c5;in an outer region of the polycrystalline CVD diamond wafer from 20 to 40 mm radius there are no more than 200 microfeaturesof a size between 0.002 and 0.008 mm, no more than 150 microfeatures of a size between 0.008 and 0.018 mm, no more than 100 microfeatures of a size between 0.018 and 0.05 mm, and zero microfeatures of a size between 0.05 and 0.1 mm.

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Didcot, United Kingdom

Benjamin Wickham