Influence of siliconizing on the oxidation behavior of plasma sprayed MoSi2 coating for niobium based alloy

Jia Sun; Qiangang Fu; Liping Guo

doi:10.1016/j.intermet.2016.01.006

Influence of siliconizing on the oxidation behavior of plasma sprayed MoSi₂ coating for niobium based alloy

Jia Sun, Qiangang Fu, Liping Guo

School of Materials Sience and Engineering

Northwestern Polytechnical University Xian

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

39 Scopus citations

Abstract

Plasma spraying combined with halide activated pack cementation (HAPC) was used to deposit silicide coating on Nb-based alloy. X-ray diffraction (XRD) and energy disperse spectrum (EDS) indicate the formation of the siliconized NbSi₂ transition layer and the sprayed MoSi₂ outer layer. NbSi₂ layer prepared with HAPC exhibits relatively uneven surface which could promote the deposition of the sprayed MoSi₂. The coating specimen with 5 h siliconizing presented the best oxidation resistance with only 0.18% mass gain after 25 h oxidation at 1200 °C in air. The synergistic protection effect, depending on the continuous silica layer formed on the coating surface and the dispersal silica within the coating and interface, is responsible for the excellent oxidation resistance of the coating.

Original language	English
Pages (from-to)	9-16
Number of pages	8
Journal	Intermetallics
Volume	72
DOIs	https://doi.org/10.1016/j.intermet.2016.01.006
State	Published - 1 May 2016

Keywords

Niobium alloy
Oxidation behavior
Pack cementation
Plasma spray

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10.1016/j.intermet.2016.01.006

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title = "Influence of siliconizing on the oxidation behavior of plasma sprayed MoSi2 coating for niobium based alloy",

abstract = "Plasma spraying combined with halide activated pack cementation (HAPC) was used to deposit silicide coating on Nb-based alloy. X-ray diffraction (XRD) and energy disperse spectrum (EDS) indicate the formation of the siliconized NbSi2 transition layer and the sprayed MoSi2 outer layer. NbSi2 layer prepared with HAPC exhibits relatively uneven surface which could promote the deposition of the sprayed MoSi2. The coating specimen with 5 h siliconizing presented the best oxidation resistance with only 0.18% mass gain after 25 h oxidation at 1200 °C in air. The synergistic protection effect, depending on the continuous silica layer formed on the coating surface and the dispersal silica within the coating and interface, is responsible for the excellent oxidation resistance of the coating.",

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T1 - Influence of siliconizing on the oxidation behavior of plasma sprayed MoSi2 coating for niobium based alloy

AU - Sun, Jia

AU - Fu, Qiangang

AU - Guo, Liping

PY - 2016/5/1

Y1 - 2016/5/1

N2 - Plasma spraying combined with halide activated pack cementation (HAPC) was used to deposit silicide coating on Nb-based alloy. X-ray diffraction (XRD) and energy disperse spectrum (EDS) indicate the formation of the siliconized NbSi2 transition layer and the sprayed MoSi2 outer layer. NbSi2 layer prepared with HAPC exhibits relatively uneven surface which could promote the deposition of the sprayed MoSi2. The coating specimen with 5 h siliconizing presented the best oxidation resistance with only 0.18% mass gain after 25 h oxidation at 1200 °C in air. The synergistic protection effect, depending on the continuous silica layer formed on the coating surface and the dispersal silica within the coating and interface, is responsible for the excellent oxidation resistance of the coating.

AB - Plasma spraying combined with halide activated pack cementation (HAPC) was used to deposit silicide coating on Nb-based alloy. X-ray diffraction (XRD) and energy disperse spectrum (EDS) indicate the formation of the siliconized NbSi2 transition layer and the sprayed MoSi2 outer layer. NbSi2 layer prepared with HAPC exhibits relatively uneven surface which could promote the deposition of the sprayed MoSi2. The coating specimen with 5 h siliconizing presented the best oxidation resistance with only 0.18% mass gain after 25 h oxidation at 1200 °C in air. The synergistic protection effect, depending on the continuous silica layer formed on the coating surface and the dispersal silica within the coating and interface, is responsible for the excellent oxidation resistance of the coating.

KW - Niobium alloy

KW - Oxidation behavior

KW - Pack cementation

KW - Plasma spray

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DO - 10.1016/j.intermet.2016.01.006

M3 - 文章

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JO - Intermetallics

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Influence of siliconizing on the oxidation behavior of plasma sprayed MoSi₂ coating for niobium based alloy

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Keywords

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