Surface performance of nanoscale particles and amorphous reinforced laser alloying coatings

Abstract

The laser alloying (LA) metal–ceramics coatings usually show a general wear resistance. To improve this condition, the nanoscale particles (NP) and amorphous reinforced LA coating was researched. The synthesis of a hard coating on a TA7 titanium alloy by laser alloying (LA) of Stellite12–Zn-B₄C mixed powders was investigated by means of scanning electron microscope (SEM) and high resolution transmission electron microscope (HRTEM). The novel aspect of the proposed system is that lot of the nanorods and the amorphous phases are found to be produced in such LA coating, and the nanoscale CoZn₁₃ phase is appeared at the intersplat region, and its lattice value is very compatible to its d-space at the orientation of (221). Compared with a TA7 alloy substrate, an improvement of the wear resistance was observed for such LA composite coating. This study provides the theoretical and experimental to promote the application of LA technique in surface modifications of titanium alloys.

Keywords:

• Laser alloying
• Amorphous
• Coatings
• Surfaces

This work was supported by the Natural Science Foundation of China (grant no. 50872068), the Scientific Research Foundation of University of Jinan (grant no. XKY1101) and the Doctor Foundation of University of Jinan (grant no. XBS1305)