Microstructure and oxidation resistance of Ti modified Si-Mo coating on Nb-Si based ultrahigh temperature alloy

Longfei Li; Xiping Guo

doi:10.1016/j.corsci.2023.111293

Microstructure and oxidation resistance of Ti modified Si-Mo coating on Nb-Si based ultrahigh temperature alloy

Longfei Li, Xiping Guo

School of Materials Sience and Engineering

Northwestern Polytechnical University Xian

Research output: Contribution to journal › Article › peer-review

18 Scopus citations

Abstract

Ti modified Si-Mo coatings have been successfully prepared on Nb-Si based ultrahigh temperature alloy by slurry sintering method. The results show that the addition of Ti as well as its content has an obvious influence on the density, grain size and oxidation resistance of the coatings. The 5 at% Ti modified coating possesses the best oxidation protection performance with a multi-layered structure consisting of a C11_b MoSi₂/C40 (Mo,Ti)Si₂ outer layer and a dense (Ti,Nb)₅Si₄/(Nb,X)₅Si₃ inner layer. After oxidation, the formation of SiO₂ and TiO₂ can quickly seal the holes in the coating and form a dense SiO₂/TiO₂ scale.

Original language	English
Article number	111293
Journal	Corrosion Science
Volume	220
DOIs	https://doi.org/10.1016/j.corsci.2023.111293
State	Published - 1 Aug 2023

Keywords

C11 MoSi
C40 (Mo,Ti)Si
Nb-Si based ultrahigh temperature alloy
Oxidation behavior
Slurry sintering

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10.1016/j.corsci.2023.111293

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title = "Microstructure and oxidation resistance of Ti modified Si-Mo coating on Nb-Si based ultrahigh temperature alloy",

abstract = "Ti modified Si-Mo coatings have been successfully prepared on Nb-Si based ultrahigh temperature alloy by slurry sintering method. The results show that the addition of Ti as well as its content has an obvious influence on the density, grain size and oxidation resistance of the coatings. The 5 at% Ti modified coating possesses the best oxidation protection performance with a multi-layered structure consisting of a C11b MoSi2/C40 (Mo,Ti)Si2 outer layer and a dense (Ti,Nb)5Si4/(Nb,X)5Si3 inner layer. After oxidation, the formation of SiO2 and TiO2 can quickly seal the holes in the coating and form a dense SiO2/TiO2 scale.",

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doi = "10.1016/j.corsci.2023.111293",

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T1 - Microstructure and oxidation resistance of Ti modified Si-Mo coating on Nb-Si based ultrahigh temperature alloy

AU - Li, Longfei

AU - Guo, Xiping

PY - 2023/8/1

Y1 - 2023/8/1

N2 - Ti modified Si-Mo coatings have been successfully prepared on Nb-Si based ultrahigh temperature alloy by slurry sintering method. The results show that the addition of Ti as well as its content has an obvious influence on the density, grain size and oxidation resistance of the coatings. The 5 at% Ti modified coating possesses the best oxidation protection performance with a multi-layered structure consisting of a C11b MoSi2/C40 (Mo,Ti)Si2 outer layer and a dense (Ti,Nb)5Si4/(Nb,X)5Si3 inner layer. After oxidation, the formation of SiO2 and TiO2 can quickly seal the holes in the coating and form a dense SiO2/TiO2 scale.

AB - Ti modified Si-Mo coatings have been successfully prepared on Nb-Si based ultrahigh temperature alloy by slurry sintering method. The results show that the addition of Ti as well as its content has an obvious influence on the density, grain size and oxidation resistance of the coatings. The 5 at% Ti modified coating possesses the best oxidation protection performance with a multi-layered structure consisting of a C11b MoSi2/C40 (Mo,Ti)Si2 outer layer and a dense (Ti,Nb)5Si4/(Nb,X)5Si3 inner layer. After oxidation, the formation of SiO2 and TiO2 can quickly seal the holes in the coating and form a dense SiO2/TiO2 scale.

KW - C11 MoSi

KW - C40 (Mo,Ti)Si

KW - Nb-Si based ultrahigh temperature alloy

KW - Oxidation behavior

KW - Slurry sintering

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DO - 10.1016/j.corsci.2023.111293

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Microstructure and oxidation resistance of Ti modified Si-Mo coating on Nb-Si based ultrahigh temperature alloy

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