Abstract
TiN-TiB2 composite coatings were fabricated on a low carbon steel by using argon arc cladding (AAC) with the mixture of titanium powder and boron nitride powder. The effect of the Ti + BN contents on the phase, microstructure, and properties of composite coatings was investigated by means of XRD, TEM, SEM, hardness tests, and wear tests. The experimental results show that the main phase TiN and TiB2 were formed due to the reaction between titanium and boron nitride during the AAC process. The composite coatings had no holes, cracks, or other defects and metallurgical bond with the steel substrate. The morphologies of particle-shaped, needle-shaped and rod-like of in situ synthesis particles phases were found in the composite coatings. The microhardness of the composite coatings (1100-) increased with the increase of the Ti + BN contents due to the presence of reinforcement (TiN, TiB2) and gradually increased. The friction coefficient and wear loss of the composite coatings is far lower than the 35CrMnSi steel substrate. Besides, argon arc coating using the mixed powders of 30 wt%(Ti + BN)-70 wt%Ni has better anti-wearing effects during the dry sliding wear.
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