Journal of Materials Engineering and Performance

, Volume 27, Issue 4, pp 1876–1889 | Cite as

Effects of TiB2 Particle and Short Fiber Sizes on the Microstructure and Properties of TiB2-Reinforced Composite Coatings

  • Yinghua Lin
  • Jianhua Yao
  • Liang Wang
  • Qunli Zhang
  • Xueqiao Li
  • Yongping Lei
  • Hanguang Fu
Article

Abstract

In this study, particle and short fiber-reinforced titanium matrix composite coatings are prepared via laser in situ technique using (0.5 and 50 μm) TiB2 and Ti powder as cladding materials. The microstructure and properties of the composite coatings are studied, and the changing mechanism of the microstructure is discussed. The results reveal that particle agglomeration is prone to appear with using fine TiB2 particles. Decomposition of the particles preferentially occurs with using coarse TiB2 particles. The cracks and pores on the surface of the coating are formed at a lower laser energy density. With the increase in the laser energy density, cracking on the surface of the coating diminishes, but the coating exhibits depression behavior. The depression extent of the coating using fine TiB2 particle as the reinforcement is much less than that of the coating using coarse TiB2 particle. Moreover, the size of the aggregate and the tendency of cracking can be reduced with the increase in Ti addition. Meanwhile, short TiB fiber bundles are formed by the diffusion mechanism of rod aggregate, and randomly oriented TiB short fibers are formed mainly by the dissolution–precipitation mechanism of fine TiB2 particles. Moreover, the growth of short TiB fibers can be in an alternating manner between B27 and Bf structures. The micro-hardness and wear resistance of the coatings are evidently higher than that of the titanium alloy substrate. The wear resistance of the large size TiB2 coating is higher than that of the small size TiB2 coating under the condition of low load.

Keywords

coating laser cladding microstructure properties TiB2 

Notes

Acknowledgment

The authors are grateful for financial supports from National Key R&D Program of China (No. 2017YFB1103601), National Natural Science Foundation of China (No. 51705464) and Post-Doctor Research Fund of China (No. 2017M610376).

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Copyright information

© ASM International 2018

Authors and Affiliations

  • Yinghua Lin
    • 1
    • 2
  • Jianhua Yao
    • 1
    • 2
  • Liang Wang
    • 1
    • 2
  • Qunli Zhang
    • 1
    • 2
  • Xueqiao Li
    • 3
  • Yongping Lei
    • 3
  • Hanguang Fu
    • 3
  1. 1.Institute of Laser Advanced ManufacturingZhejiang University of TechnologyHangzhouChina
  2. 2.Zhejiang Provincial Collaborative Innovation Center of High-end Laser Manufacturing EquipmentHangzhouChina
  3. 3.College of Materials Science and EngineeringBeijing University of TechnologyBeijingChina

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