A Ni-based alloy/nano-h-BN self-lubricating composite coating was produced on medium carbon steel by high velocity oxygen\nfuel (HVOF) spraying technique.The powder feedstocks for HVOF spraying were prepared by ball milling and agglomerated the\nnano-h-BN with Ni-based alloy powders. The microstructure and mechanical properties of coatings have been investigated.With\nthe increasing of h-BN contents, some delaminations appeared gradually in the coatings and a continuous network with h-BN\nphase embedded formed in the metallic matrix. The average microhardness of the self-lubricating coating was a little lower for the\naddition of soft solid lubricant.The friction coefficient of coatings is in the ranges of 0.38ââ?¬â??0.48 and 0.38ââ?¬â??0.52 at ambient temperature\nand 400âË?Ë?C, respectively.The maximum bonding strength of coatings reached 23.83MPa.
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