| 摘要 |
<p>A free-standing non-planar polycrystalline synthetic diamond component, preferably a loudspeaker diaphragm, is manufactured by a CVD process. The component comprises a nucleation face and a growth face, the nucleation face comprising smaller grains than the growth face and the nucleation face having a surface roughness Ra no more than 50 nm. The component has a longest linear dimension when projected onto a plane of no less than 5 mm and is substantially crack free over at least a central region thereof, wherein the central region is at least 70% of a total area of the free-standing non-planar polycrystalline CVD synthetic diamond component, wherein the central region has no cracks which intersect both external major faces of the free-standing non-planar polycrystalline CVD synthetic diamond component and extend greater than 2 mm in length. Conditions for the CVD process are set out in the description.</p> |
