The preparation of a two‐phase coating of B 4 C‐BN was addressed as a potential wear coating because of its likelihood of having a high fracture toughness resulting from its composite nature and inherent lubrication due to the presence of BN. Equilibrium analysis identified appropriate deposition conditions; however, deposited coatings were found to be single‐phase BN with a high degree of substitution of carbon for nitrogen.
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Theodore M. Besmann (1990) studied this question.