Microstructure and Wear Resistance of Ti<sub>5</sub>Si<sub>3</sub>/Ti<sub>3</sub>Al Composite Coatings Prepared by Laser Cladding on TA2 Titanium Alloy

oleh: Kaijin Huang, Wanxia Huang

Format: Article
Diterbitkan: MDPI AG 2023-05-01

Deskripsi

In order to improve the wear resistance of titanium alloy, a Ti<sub>5</sub>Si<sub>3</sub>/Ti<sub>3</sub>Al composite coating with improved wear resistance was successfully prepared by laser cladding TA2 titanium alloy using the double-layer presetting method of Ti-63 wt.% Al mixed powder layer/Si powder layer. The microstructure, phase composition and wear resistance of the coating were studied using X-ray diffraction (XRD), scanning electron microscopy (SEM) and pin-disk friction and wear method. The results show that the coating is mainly composed of the Ti<sub>5</sub>Si<sub>3</sub> primary phase and Ti<sub>5</sub>Si<sub>3</sub>/Ti<sub>3</sub>Al eutectic structure. The microhardness of the coating is higher than that of the matrix. The average microhardness of the coating is about 668 HV<sub>0.1</sub>, which is 3.34 times that of the matrix. The coating significantly improves the wear resistance of the TA2 matrix, and the mass wear rate is 1/5.79 of that of the TA2 matrix. The main wear mechanisms of the coating are abrasive wear, adhesive wear and oxidative wear, whereas the main wear mechanisms of the TA2 matrix are adhesive wear and oxidative wear.