TiBCN-Ceramic-Reinforced Ti-Based Coating by Laser Cladding: Analysis of Processing Conditions and Coating Properties

Coatings

Pengfei Zhang¹  Peikang Bai²  Keqiang Su²  Yuxin Li²  Hongwen Su³ 

[1] Lab. of Materials Welding and Joining, School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China;Shanxi Key Laboratory of Controlled Metal Solidification and Precision Manufacturing, School of Materials Science and Engineering, North University of China, Taiyuan 030051, China;Shanxi Yuhua Remanufacture Technology Co., Ltd., Changzhi 046000, China;

关键词: laser cladding;    geometrical characteristics;    microstructure;    microhardness;    corrosion resistance;    wear resistance;   

DOI  :  10.3390/coatings9060407

来源: DOAJ

【 摘 要 】

In this paper, TiBCN-ceramic-reinforced Ti-based coating was fabricated on a Ti6Al4V substrate surface by laser cladding. The correlations between the main processing parameters and the geometrical characteristics of single clad tracks were predicted by linear regression analysis. On this basis, the microstructure, microhardness, corrosion resistance, and wear resistance of the coating and the substrate were investigated. The results showed that the clad height, clad width, clad depth, and dilution rate depended mainly on the laser power, the powder feeding rate, and the scanning speed. TiBCN-ceramic-reinforced Ti-based coating was mainly composed of directional dendritic TiBCN phases, equiaxed TiN phases, needle-like Al₃Ti phases, and Ti phases. The microhardness gradually increased from the bottom to the top of the coating. The highest microhardness of coating was 1025 HV, which was three times higher than that of the Ti6Al4V substrate (350 HV). Furthermore, the coating exhibited excellent corrosion resistance and wear resistance. The corrosion potential (E_corr) reached −1.258 V, and the corrosion density (I_corr) was 4.035 × 10⁻⁵ A/cm², which was one order lower than that of the Ti6Al4V substrate (1.172 × 10⁻⁴ A/cm²). The coating wear mass loss was 4.35 mg, which was about two-third of the wear mass loss of the Ti6Al4V substrate (6.71 mg).

【 授权许可】

Unknown