Microstructure formation and wear resistance of TiB2-strengthened TiAl3 composite coating on TC4 alloy

被引：0
作者：
Tian X.-D. [1 ]
Kong M. [1 ]
Gao S. [1 ]
Qu S.-K. [1 ]
Zhou R.-J. [1 ]
Sun Z.-P. [1 ]
机构：
[1] Engineering Research Center of Transportation Materials of Ministry of Education, School of Materials Science and Engineering, Chang’an University, Xi’an
来源：
Surface Technology | 2021年 / 50卷 / 06期
关键词：
Boride; Coating; Intermetallic compound; Titanium alloy; Wear resistance;
D O I：
10.16490/j.cnki.issn.1001-3660.2021.06.029
中图分类号：
学科分类号：
摘要：
This work aims to prepare diffusion coating on TC4 titanium alloy to improve its wear resistance. By using the method of pack cementation technique, TiB2-strengthened TiAl3 composite coating was prepared through firstly depositing B at 950~1100 °C for 4~8 h and then depositing Al at 950~1100 °C for 4 h. X-ray diffraction (XRD), scanning electron microscope (SEM), energy dispersion spectrum (EDS) and wave dispersion spectrum (WDS) were used to analyze the morphology and structure of the coating. Based on the analysis results of microstructure, surface roughness, hardness and wear rate of the TiB2-strengthened TiAl3 composite coating, combined with the thermodynamic analysis of B and Al deposition processes, the formation mechanism and wear resistance of the TiB2-strengthened TiAl3 composite coating are clarified. The thickness of the TiB2-strengthened TiAl3 composite coating is about 37~108 µm and its surface roughness is about 5.485~9.320 µm. The composite coating is composed of boride and Ti-Al intermetallic compounds. The TiAl3 layer is the main body of the TiB2- strengthened TiAl3 composite coating, and boride phase is mainly distributed on the surface of the composite coating, forming TiB2 continuous layer or dispersing in the outermost part of the TiAl3 layer. The morphology and distribution of borides in the TiB2-strengthened TiAl3 composite coating can be controlled by adjusting the deposition temperature and time of aluminizing. When abrading with GCr15 under the condition of dry friction at room temperature, the wear rate of the TiB2-strengthened TiAl3 composite coating can be as low as 2.65×10-5 g/(N.m), which is reduced by 75.0% compared with the corresponding B deposition layer. The TiB2-strengthened TiAl3 composite coating shows better wear resistance than that of the B deposition layer. © 2021, Chongqing Wujiu Periodicals Press. All rights reserved.
引用
收藏
页码：258 / 264
页数：6
相关论文
共 30 条
  • [1] Leyens C., Peters M., Titanium an titanium alloy[M], (2005)
  • [2] Gyawali G., Tripathi K., Joshi B., Et al., Mechanical and tribological properties of Ni-W-TiB<sub>2</sub> composite coatings[J], Journal of alloys and compounds, 721, pp. 757-763, (2017)
  • [3] Du B.-S., Zou Z.-D., Wang X.-H., Et al., Laser cladding of in situ TiB<sub>2</sub>/Fe composite coating on steel[J], Applied surface science, 254, 20, pp. 6489-6494, (2008)
  • [4] Hou S.-X., Liu Z.-D., Liu D.-Y., The study of NiAl-TiB<sub>2</sub> coatings prepared by electro-thermal explosion ultrahigh speed spraying technology[J], Surface and coatings technology, 205, 19, pp. 4562-4568, (2011)
  • [5] Mockute A., Palisaitis J., Alling B., Age hardening in (Ti<sub>1-x</sub>Al<sub>x</sub>)B<sub>2</sub>+Δ thin films[J], Scripta materialia, 127, 15, pp. 122-126, (2017)
  • [6] Munro R.G., Material properties of titanium diboride[J], Journal of Research of the National Institute of Standards and Technology, 105, 5, pp. 709-720, (2000)
  • [7] Dai J.J., Li S.Y., Zhang H.X., Microstructure and wear properties of self-lubricating TiB<sub>2</sub>-TiC<sub>x</sub>N<sub>y</sub> ceramic coatings on Ti-6Al-4V alloy fabricated by laser surface alloying[J], Surface and coatings technology, 369, pp. 269-279, (2019)
  • [8] Lin Y.H., Lei Y.P., Li X.Q., Et al., A study of TiB<sub>2</sub>/TiB gradient coating by laser cladding on titanium alloy[J], Optics and lasers in engineering, 82, pp. 48-55, (2016)
  • [9] Popoola A.P.I., Phume L., Pityana S., Et al., In-situ formation of laser Ti6Al4V-TiB composite coatings on Ti6Al4V alloy for biomedical application[J], Surface and coatings technology, 285, pp. 161-170, (2016)
  • [10] Pflhl C., Bulak A., Rie K.T., Development of titanium diboride coatings deposited by PACVD[J], Surface and coatings technology, 131, 1-3, pp. 141-146, (2000)
123