Microstructure performance of the ceramics-reinforced laser alloying composite coating on titanium

This work was based on the dry sliding wear of Al-Cu-Sn matrix composite coating deposited on titanium using laser alloying technique, the parameters of which were such as to provide almost crack-free coatings with minimum dilution and very low porosity. To our knowledge, it is the first time that Al-Cu-Sn+B4C mixed powders were deposited as hard coating by laser alloying technique. Scanning electron microscopy results indicated that a laser alloying coating with metallurgical joint to the substrate was formed, and hard fine particles were produced in the matrix of the upper coating due to the in situ metallurgical reactions. Compared with titanium substrate, improvement of the microhardness and wear resistance were observed for such composite coating