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Is CVD diamond as hard as natural or synthetic single crystal diamond?

April 26, 2017crystal CVD diamond hard natural synthetic

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Is CVD diamond as hard as natural or synthetic single crystal diamond?

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A. Both natural and synthetic single crystal diamond have measured hardness values which are dependent on the crystal orientation of the face measured using indentation hardness techniques. This typically ranges from 57GPa (for the (100) surface) to 104GPa (for the (111) surface) in Knoop hardness value. CVD diamond (which is polycrystalline) has no single crystal orientation and consequently no orientation dependence of its bulk hardness which has been measured as 81Ã??Ã?Â±18GPa.