Abstract
Boron carbide (B 4C) coatings on diamond offer potential for obtaining homogeneous B 4C-diamond composites with improved properties. A method was developed for coating diamond particles with B 4C at 1150 °C under argon atmosphere for dwell times of 2–6 hours in a powder mixture of boric acid (H 3BO 3) and amorphous boron. The B 4C coating showed very good adhesion to the diamond substrate, and an unusual five-fold symmetry thought to be due to a twinned growth mechanism. The sudden onset of nucleation at T > 1000 °C is ascribed to the stabilising effect of hydrogen from the decomposition of H 3BO 3 on the diamond surface reactivity.
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