Microstructure formation of silicide coating on Nb–W–Mo–Zr alloy

Yanqiang Qiao; Kewei Zheng; Xiping Guo

doi:10.1080/02670844.2018.1547247

Microstructure formation of silicide coating on Nb–W–Mo–Zr alloy

Yanqiang Qiao, Kewei Zheng, Xiping Guo

School of Materials Sience and Engineering

Northwestern Polytechnical University Xian

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

16 Scopus citations

Abstract

Silicide coatings were deposited on the Nb–5W–2.5Mo–1Zr alloy by pack cementation method. The microstructure, phase distribution, growth kinetics and oxidation behaviour of the coatings were studied. The results show that the coatings were mainly composed of an outer NbSi ₂ layer, an acicular Nb ₅ Si ₃ -dispersed NbSi ₂ two-phase layer and a Nb ₅ Si ₃ inner layer, exhibiting a three-layer structure. The temperature and holding time both have a significant effect on the coating formation. It was found that the coating growth kinetics at 1250°C followed a parabolic law. The coating exhibited a relatively good short-term protection to the substrate in static air at 850 and 1250°C. Both scales formed at the two oxidation temperatures consisted mainly of a mixture of SiO ₂ , Nb ₂ O ₅ and NbO.

Original language	English
Pages (from-to)	588-595
Number of pages	8
Journal	Surface Engineering
Volume	35
Issue number	7
DOIs	https://doi.org/10.1080/02670844.2018.1547247
State	Published - 3 Jul 2019

Keywords

Nb-based alloy
oxidation
pack cementation
silicide coating

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title = "Microstructure formation of silicide coating on Nb–W–Mo–Zr alloy",

abstract = " Silicide coatings were deposited on the Nb–5W–2.5Mo–1Zr alloy by pack cementation method. The microstructure, phase distribution, growth kinetics and oxidation behaviour of the coatings were studied. The results show that the coatings were mainly composed of an outer NbSi 2 layer, an acicular Nb 5 Si 3 -dispersed NbSi 2 two-phase layer and a Nb 5 Si 3 inner layer, exhibiting a three-layer structure. The temperature and holding time both have a significant effect on the coating formation. It was found that the coating growth kinetics at 1250°C followed a parabolic law. The coating exhibited a relatively good short-term protection to the substrate in static air at 850 and 1250°C. Both scales formed at the two oxidation temperatures consisted mainly of a mixture of SiO 2 , Nb 2 O 5 and NbO.",

keywords = "Nb-based alloy, oxidation, pack cementation, silicide coating",

author = "Yanqiang Qiao and Kewei Zheng and Xiping Guo",

note = "Publisher Copyright: {\textcopyright} 2018, {\textcopyright} 2018 Institute of Materials, Minerals and Mining Published by Taylor & Francis on behalf of the Institute.",

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doi = "10.1080/02670844.2018.1547247",

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TY - JOUR

T1 - Microstructure formation of silicide coating on Nb–W–Mo–Zr alloy

AU - Qiao, Yanqiang

AU - Zheng, Kewei

AU - Guo, Xiping

PY - 2019/7/3

Y1 - 2019/7/3

N2 - Silicide coatings were deposited on the Nb–5W–2.5Mo–1Zr alloy by pack cementation method. The microstructure, phase distribution, growth kinetics and oxidation behaviour of the coatings were studied. The results show that the coatings were mainly composed of an outer NbSi 2 layer, an acicular Nb 5 Si 3 -dispersed NbSi 2 two-phase layer and a Nb 5 Si 3 inner layer, exhibiting a three-layer structure. The temperature and holding time both have a significant effect on the coating formation. It was found that the coating growth kinetics at 1250°C followed a parabolic law. The coating exhibited a relatively good short-term protection to the substrate in static air at 850 and 1250°C. Both scales formed at the two oxidation temperatures consisted mainly of a mixture of SiO 2 , Nb 2 O 5 and NbO.

AB - Silicide coatings were deposited on the Nb–5W–2.5Mo–1Zr alloy by pack cementation method. The microstructure, phase distribution, growth kinetics and oxidation behaviour of the coatings were studied. The results show that the coatings were mainly composed of an outer NbSi 2 layer, an acicular Nb 5 Si 3 -dispersed NbSi 2 two-phase layer and a Nb 5 Si 3 inner layer, exhibiting a three-layer structure. The temperature and holding time both have a significant effect on the coating formation. It was found that the coating growth kinetics at 1250°C followed a parabolic law. The coating exhibited a relatively good short-term protection to the substrate in static air at 850 and 1250°C. Both scales formed at the two oxidation temperatures consisted mainly of a mixture of SiO 2 , Nb 2 O 5 and NbO.

KW - Nb-based alloy

KW - oxidation

KW - pack cementation

KW - silicide coating

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U2 - 10.1080/02670844.2018.1547247

DO - 10.1080/02670844.2018.1547247

M3 - 文章

AN - SCOPUS:85057320822

SN - 0267-0844

VL - 35

SP - 588

EP - 595

JO - Surface Engineering

JF - Surface Engineering

IS - 7

ER -

Microstructure formation of silicide coating on Nb–W–Mo–Zr alloy

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Keywords

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