Abstract
In this work, a wear-resistant TiOxNy/α-Ti composite coating was deposited by laser cladding TiO2 powder onto Ti–6Al–4V in air. Dendritic TiOxNy reinforcements were synthesized in situ via reactions between Ti, TiO2 and N2. The partially-melted substrate mixed with the ceramic melt and formed α-Ti matrix that bonded chemically with the reinforcements. Stacking faults, induced by thermal stress, were found in the TiOxNy grains, which exerted a strain hardening effect. The coating had an average microhardness of 1417 HV0.3, four times that of Ti–6Al–4V. The wear resistance of the composite coating was 3.7 times that of Ti–6Al–4V, which was attributed to its high hardness and the strong TiOxNy/α-Ti and coating/substrate interfaces.
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