1. Microstructure and anti-ablation of laser cladding Ti-Zr-B-C coating on TC11 titanium alloy.
- Author
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Zhao, X.J., Fang, S.Q., Lyu, P.Z., Fang, J.S., Jiang, Y.X., Ren, P.H., Peng, Z.W., Chen, L.M., Xiao, L.R., and Liu, S.N.
- Subjects
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TITANIUM alloys , *SURFACE coatings , *MICROSTRUCTURE , *ANTIREFLECTIVE coatings , *LASERS , *TITANIUM dioxide , *SERVICE life - Abstract
To enhance the service life and application range of titanium alloys in the aerospace sector, Ti-Zr-B-C coatings with varying B 4 C contents (0–30 wt%) on TC11 titanium alloy was fabricated by laser cladding. The microstructure and anti-ablation were investigated in the present work. The results show that the whisker-like TiB phases and granular TiC and ZrC phases were observed in the coatings due to the in-situ reactions. With increasing the content of B 4 C, the number of reinforcing phases in the coating increased and distributed uniformly, resulting in the improvement of the microhardness up to 803.8HV. Furthermore, due to the formation of TiO 2 -ZrO 2 -B 2 O 3 dense multiphase oxide layer on the surface during the ablation process, the coating with 20 wt% B 4 C exhibited the best anti-ablation at 1400ºC, the mass ablation rate (MAR) and linear ablation rate (LAR) were −2.62 mg/s and 3.67μm/s, respectively, which were just 62.8 % and 50.07 % in comparison with the substrate. This is mainly attributed to the formation of TiO 2 -ZrO 2 -B 2 O 3 layer is beneficial to reduce the infiltration of O 2 and the evaporation of liquid B 2 O 3 , leading to the excellent anti-ablation. • The TiB, TiC and ZrC reinforcing phases were in-situ formed in the Ti-Zr-B-C coating via laser cladding. • With increasing the content of B 4 C, the microhardness of the coating increased gradually. • The coating with 20wt% B 4 C exhibited the best anti-ablation among all the coatings. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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