Preparation and oxidation resistance of silicide/aluminide composite coatings on an Nb-Ti-Si based alloy

Ping Zhang; Xiping Guo

doi:10.1016/j.surfcoat.2015.04.016

Preparation and oxidation resistance of silicide/aluminide composite coatings on an Nb-Ti-Si based alloy

Ping Zhang
, Xiping Guo

School of Materials Sience and Engineering

Northwestern Polytechnical University Xian

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

14 Scopus citations

Abstract

Silicide/aluminide composite coatings were prepared on an Nb-Ti-Si based alloy by a two-step pack cementation process including siliconizing firstly and then aluminizing. The siliconized coating is composed of a thick (Nb,X)Si₂ outer layer and a thin (Ti,Nb)₅Si₄ inner layer. During the aluminizing process, the original (Nb,X)Si₂ outer layer retains and Al moves through it to form an Al₃(Nb,X) layer beneath it. Besides, a thin Al₃(Nb,X) outermost layer also forms above the (Nb,X)Si₂ layer. This composite coating possesses good oxidation resistance at 1250°C within 50h, and a double-layered scale with an Al₂O₃ outer layer and a SiO₂-matrix inner layer forms.

Original language	English
Pages (from-to)	18-25
Number of pages	8
Journal	Surface and Coatings Technology
Volume	274
DOIs	https://doi.org/10.1016/j.surfcoat.2015.04.016
State	Published - 25 Jul 2015

Keywords

Microstructure
Nb-Ti-Si based alloy
Oxidation resistance
Silicide/aluminide composite coating
Two-step pack cementation

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10.1016/j.surfcoat.2015.04.016

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title = "Preparation and oxidation resistance of silicide/aluminide composite coatings on an Nb-Ti-Si based alloy",

abstract = "Silicide/aluminide composite coatings were prepared on an Nb-Ti-Si based alloy by a two-step pack cementation process including siliconizing firstly and then aluminizing. The siliconized coating is composed of a thick (Nb,X)Si2 outer layer and a thin (Ti,Nb)5Si4 inner layer. During the aluminizing process, the original (Nb,X)Si2 outer layer retains and Al moves through it to form an Al3(Nb,X) layer beneath it. Besides, a thin Al3(Nb,X) outermost layer also forms above the (Nb,X)Si2 layer. This composite coating possesses good oxidation resistance at 1250°C within 50h, and a double-layered scale with an Al2O3 outer layer and a SiO2-matrix inner layer forms.",

keywords = "Microstructure, Nb-Ti-Si based alloy, Oxidation resistance, Silicide/aluminide composite coating, Two-step pack cementation",

author = "Ping Zhang and Xiping Guo",

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year = "2015",

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doi = "10.1016/j.surfcoat.2015.04.016",

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TY - JOUR

T1 - Preparation and oxidation resistance of silicide/aluminide composite coatings on an Nb-Ti-Si based alloy

AU - Zhang, Ping

AU - Guo, Xiping

PY - 2015/7/25

Y1 - 2015/7/25

N2 - Silicide/aluminide composite coatings were prepared on an Nb-Ti-Si based alloy by a two-step pack cementation process including siliconizing firstly and then aluminizing. The siliconized coating is composed of a thick (Nb,X)Si2 outer layer and a thin (Ti,Nb)5Si4 inner layer. During the aluminizing process, the original (Nb,X)Si2 outer layer retains and Al moves through it to form an Al3(Nb,X) layer beneath it. Besides, a thin Al3(Nb,X) outermost layer also forms above the (Nb,X)Si2 layer. This composite coating possesses good oxidation resistance at 1250°C within 50h, and a double-layered scale with an Al2O3 outer layer and a SiO2-matrix inner layer forms.

AB - Silicide/aluminide composite coatings were prepared on an Nb-Ti-Si based alloy by a two-step pack cementation process including siliconizing firstly and then aluminizing. The siliconized coating is composed of a thick (Nb,X)Si2 outer layer and a thin (Ti,Nb)5Si4 inner layer. During the aluminizing process, the original (Nb,X)Si2 outer layer retains and Al moves through it to form an Al3(Nb,X) layer beneath it. Besides, a thin Al3(Nb,X) outermost layer also forms above the (Nb,X)Si2 layer. This composite coating possesses good oxidation resistance at 1250°C within 50h, and a double-layered scale with an Al2O3 outer layer and a SiO2-matrix inner layer forms.

KW - Microstructure

KW - Nb-Ti-Si based alloy

KW - Oxidation resistance

KW - Silicide/aluminide composite coating

KW - Two-step pack cementation

UR - https://www.scopus.com/pages/publications/84929656132

U2 - 10.1016/j.surfcoat.2015.04.016

DO - 10.1016/j.surfcoat.2015.04.016

M3 - 文章

AN - SCOPUS:84929656132

SN - 0257-8972

VL - 274

SP - 18

EP - 25

JO - Surface and Coatings Technology

JF - Surface and Coatings Technology

ER -

Preparation and oxidation resistance of silicide/aluminide composite coatings on an Nb-Ti-Si based alloy

Abstract

Keywords

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