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Mechanism of YSZ diffusion barrier on restraining interdiffusion of Ni and Ti in NiCrAlY/TiAl alloy.

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Title: Mechanism of YSZ diffusion barrier on restraining interdiffusion of Ni and Ti in NiCrAlY/TiAl alloy.
Authors: Hua, Chen1,2,3 (AUTHOR), Huang, Taihong1,2,3 (AUTHOR), Man, Yantong1,2,3 (AUTHOR), Zhou, Rongfeng1,3 (AUTHOR), He, Xuan1,2,3 (AUTHOR), Yin, Guanwen1,2,3 (AUTHOR), Wang, Peng4 (AUTHOR), Song, Peng1,2,3,4 (AUTHOR) songpeng@kust.edu.cn
Source: Ceramics International. Apr2026:Part B, Vol. 52 Issue 9, p12708-12725. 18p.
Subjects: Yttria stabilized zirconium oxide, Diffusion control, Oxidation, Thermal barrier coatings, Titanium aluminides, Titanium nitride, Plasma spraying
Abstract: The YSZ diffusion barrier was prepared between Ti43.5Al4Nb1Mo0.1B substrate and NiCrAlY by atmospheric plasma spraying to inhibit the strong interdiffusion between the substrate and the coating. After high-temperature cyclic oxidation test at 1173 K, the results show that single NiCrAlY coating, Ti and Ni diffused seriously, which accelerated the degradation of NiCrAlY coating. However, in the duplex NiCrAlY/YSZ coating, the difference in oxygen chemical potential between the NiCrAlY and TiAl leads to the formation of an asymmetric galvanic cell in the NiCrAlY/YSZ/TiAl system at high temperatures, causing YSZ to decompose and Zr to react with Ni to form the Ni 7 Zr 2 phase. After 504 h, a relatively complete Ni 7 Zr 2 layer was formed on the surface of YSZ. In addition, the N 2 retained in the YSZ coating pores reacted with Ti at the YSZ/substrate interface to form a thin and discontinuous TiN, which to some extent inhibited the outward diffusion of Ti. Vickers hardness results also prove that the single NiCrAlY coating structural failure and effectiveness of YSZ diffusion barrier. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:The YSZ diffusion barrier was prepared between Ti43.5Al4Nb1Mo0.1B substrate and NiCrAlY by atmospheric plasma spraying to inhibit the strong interdiffusion between the substrate and the coating. After high-temperature cyclic oxidation test at 1173 K, the results show that single NiCrAlY coating, Ti and Ni diffused seriously, which accelerated the degradation of NiCrAlY coating. However, in the duplex NiCrAlY/YSZ coating, the difference in oxygen chemical potential between the NiCrAlY and TiAl leads to the formation of an asymmetric galvanic cell in the NiCrAlY/YSZ/TiAl system at high temperatures, causing YSZ to decompose and Zr to react with Ni to form the Ni 7 Zr 2 phase. After 504 h, a relatively complete Ni 7 Zr 2 layer was formed on the surface of YSZ. In addition, the N 2 retained in the YSZ coating pores reacted with Ti at the YSZ/substrate interface to form a thin and discontinuous TiN, which to some extent inhibited the outward diffusion of Ti. Vickers hardness results also prove that the single NiCrAlY coating structural failure and effectiveness of YSZ diffusion barrier. [ABSTRACT FROM AUTHOR]
ISSN:02728842
DOI:10.1016/j.ceramint.2026.01.414