Abstract: In order to improve the tribological properties of titanium alloy,a wear resistant coating with a microstructure consisting of insitu TiC primary dendrites and Ti-Ti2Co matrix was fabricated on a substrate of titanium alloy TC4 by means of laser cladding using Co-based alloy powders,activated carbon and titanium powders as the precursor materials.The microstructure and composition of the intermetallic composite coating was studied by means of optical microscope,scanning electron microscope,X-ray diffraction,energy dispersive spectrometer.The wear resistance of the coating was tested under dry sliding wear condition at room temperature.It is revealed that the laser clad composite coating has a rapidly solidified homogeneous microstructure and is metallurgically bonded to the substrate.The developed in situ TiC primary dendrites dispersed in the B-Ti-Ti2Co matrix of the coating as reinforcements.The B-Ti phase shows irregular crystal or cell dendrites.And most of the Ti2Co phase distributes over the matrix as irregular block crystal,with some lamellar Ti2Co formed in the inter-dendrite arms of the β-Ti phase.It is found that the microhardness of the coating is in the range of HV600～HV700.The laser clad TiC/ Ti-Ti2Co coating,in which the TiC phase plays a main role in enhancement,has excellent wear resistance under dry sliding wear test conditions.The results show that the coating is helpful to improve wear resistance of titanium alloy.