Microstructure and thermal impact property of B-Y doped silicon compound coating on TiAlNb9 alloy surface

doi:10.13251/j.issn.0254-6051.2023.06.026

Abstract

Abstract: B-Y doped silicon compound coating was prepared on surface of TiAlNb9 alloy by pack cementation process with 15Si-4B-8NaF-2Y₂O₃-71Al₂O₃(mass fraction, %), the structure and phase composition of the co-deposition coating were analyzed by means of scanning electron microscopy, X-ray diffractometry and electron probe, and the thermal impact properties of Si-B-Y co-deposition coating and TiAlNb9 substrate were compared. The results show that the Si-B-Y co-deposition coating prepared by holding at 1050 ℃ for 6 h has an uniform and dense composite structure with a thickness of about 14 μm. The outer layer consists of TiB₂ and (Ti, Nb)Si₂ phases, the middle layer consists of (Ti, Nb)₅Si₃ phase, and the inner layer consists of TiAl₂ and small amounts of TiB phases. Under the thermal impact at 1000 ℃, the substrate cracks in the TiAlNb9 alloy continue to grow, and there are bifurcated cracks in the middle, the penetrating cracks appear after 47 times of thermal impact. However, the Si-B-Y co-deposition coating has a long crack initiation time, the initiation of cracks is frequent and dispersive, and with the increase of the number of thermal impact, several small cracks finally merge into one place and penetrate through the substrate after 59 times of thermal impact, but the cracks do not extend horizontally at the interface of the film base, and the whole deposition layer does not fall off, indicating that Si-B-Y co-deposition coating can improve the thermal impact property of the TiAlNb9 alloy to a certain extent.

Key words: TiAlNb9 alloy, pack cementation process, Si-B-Y co-deposition coating, thermal impact property

CLC Number:

TG166.5

Wang Cunxi, Liang Guodong, Tian Xingda, Li Yongquan. Microstructure and thermal impact property of B-Y doped silicon compound coating on TiAlNb9 alloy surface[J]. Heat Treatment of Metals, 2023, 48(6): 142-146.

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