Oxidation resistance and mechanical characterization of silicide coatings on the Nb-18Ti-14Si-9Al alloy

Zhiping Sun; Xiaodong Tian; Xiping Guo; Mengjiao Yin; Fengying Zhang; Xuemin Zhang

doi:10.1016/j.ijrmhm.2017.07.016

Oxidation resistance and mechanical characterization of silicide coatings on the Nb-18Ti-14Si-9Al alloy

Zhiping Sun
, Xiaodong Tian
, Xiping Guo
, Mengjiao Yin
, Fengying Zhang
, Xuemin Zhang

School of Materials Sience and Engineering

Chang'an University

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

21 Scopus citations

Abstract

The Nb-Si alloys are attractive candidate for more advanced aircraft engines, however their oxidation resistances are poor. In this work, silicide coatings were prepared on the Nb-18Ti-14Si-9Al substrate, and we present the concern of this Nb-Si alloy with high Al content, and focused the modification effect of Al on NbSi₂ coatings. It is found that composition of the substrate alloy have an essential effect on coatings, which is composed of (Nb,Ti)Si₂ outer layer and (Nb,Ti)Si₂ + (Nb,Ti)₃Si₅Al₂ inner layer. Underneath inner layer, NbAl₃ is formed and surrounded by Nb₅Si₃. Beyond fracture toughness test, the coating still preserved the integrity and tightly adhered to substrate, no cracks nucleated between substrate and the coating. After oxidation at 1250 °C for 50 h, the mass gain of substrate and silicide coating is 398.85 mg/cm² and 2.34 mg/cm² respectively. The excellent oxidation resistance of the coating is proved to benefit from modification effects of high Al in the substrate.

Original language	English
Pages (from-to)	18-26
Number of pages	9
Journal	International Journal of Refractory Metals and Hard Materials
Volume	69
DOIs	https://doi.org/10.1016/j.ijrmhm.2017.07.016
State	Published - Dec 2017

Keywords

Al modification
Nb-Ti-Si-Al alloy
Oxidation resistance
Silicide coating

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10.1016/j.ijrmhm.2017.07.016

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title = "Oxidation resistance and mechanical characterization of silicide coatings on the Nb-18Ti-14Si-9Al alloy",

abstract = "The Nb-Si alloys are attractive candidate for more advanced aircraft engines, however their oxidation resistances are poor. In this work, silicide coatings were prepared on the Nb-18Ti-14Si-9Al substrate, and we present the concern of this Nb-Si alloy with high Al content, and focused the modification effect of Al on NbSi2 coatings. It is found that composition of the substrate alloy have an essential effect on coatings, which is composed of (Nb,Ti)Si2 outer layer and (Nb,Ti)Si2 + (Nb,Ti)3Si5Al2 inner layer. Underneath inner layer, NbAl3 is formed and surrounded by Nb5Si3. Beyond fracture toughness test, the coating still preserved the integrity and tightly adhered to substrate, no cracks nucleated between substrate and the coating. After oxidation at 1250 °C for 50 h, the mass gain of substrate and silicide coating is 398.85 mg/cm2 and 2.34 mg/cm2 respectively. The excellent oxidation resistance of the coating is proved to benefit from modification effects of high Al in the substrate.",

keywords = "Al modification, Nb-Ti-Si-Al alloy, Oxidation resistance, Silicide coating",

author = "Zhiping Sun and Xiaodong Tian and Xiping Guo and Mengjiao Yin and Fengying Zhang and Xuemin Zhang",

note = "Publisher Copyright: {\textcopyright} 2017 Elsevier Ltd",

year = "2017",

month = dec,

doi = "10.1016/j.ijrmhm.2017.07.016",

language = "英语",

volume = "69",

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TY - JOUR

T1 - Oxidation resistance and mechanical characterization of silicide coatings on the Nb-18Ti-14Si-9Al alloy

AU - Sun, Zhiping

AU - Tian, Xiaodong

AU - Guo, Xiping

AU - Yin, Mengjiao

AU - Zhang, Fengying

AU - Zhang, Xuemin

PY - 2017/12

Y1 - 2017/12

N2 - The Nb-Si alloys are attractive candidate for more advanced aircraft engines, however their oxidation resistances are poor. In this work, silicide coatings were prepared on the Nb-18Ti-14Si-9Al substrate, and we present the concern of this Nb-Si alloy with high Al content, and focused the modification effect of Al on NbSi2 coatings. It is found that composition of the substrate alloy have an essential effect on coatings, which is composed of (Nb,Ti)Si2 outer layer and (Nb,Ti)Si2 + (Nb,Ti)3Si5Al2 inner layer. Underneath inner layer, NbAl3 is formed and surrounded by Nb5Si3. Beyond fracture toughness test, the coating still preserved the integrity and tightly adhered to substrate, no cracks nucleated between substrate and the coating. After oxidation at 1250 °C for 50 h, the mass gain of substrate and silicide coating is 398.85 mg/cm2 and 2.34 mg/cm2 respectively. The excellent oxidation resistance of the coating is proved to benefit from modification effects of high Al in the substrate.

AB - The Nb-Si alloys are attractive candidate for more advanced aircraft engines, however their oxidation resistances are poor. In this work, silicide coatings were prepared on the Nb-18Ti-14Si-9Al substrate, and we present the concern of this Nb-Si alloy with high Al content, and focused the modification effect of Al on NbSi2 coatings. It is found that composition of the substrate alloy have an essential effect on coatings, which is composed of (Nb,Ti)Si2 outer layer and (Nb,Ti)Si2 + (Nb,Ti)3Si5Al2 inner layer. Underneath inner layer, NbAl3 is formed and surrounded by Nb5Si3. Beyond fracture toughness test, the coating still preserved the integrity and tightly adhered to substrate, no cracks nucleated between substrate and the coating. After oxidation at 1250 °C for 50 h, the mass gain of substrate and silicide coating is 398.85 mg/cm2 and 2.34 mg/cm2 respectively. The excellent oxidation resistance of the coating is proved to benefit from modification effects of high Al in the substrate.

KW - Al modification

KW - Nb-Ti-Si-Al alloy

KW - Oxidation resistance

KW - Silicide coating

UR - https://www.scopus.com/pages/publications/85026665814

U2 - 10.1016/j.ijrmhm.2017.07.016

DO - 10.1016/j.ijrmhm.2017.07.016

M3 - 文章

AN - SCOPUS:85026665814

SN - 0263-4368

VL - 69

SP - 18

EP - 26

JO - International Journal of Refractory Metals and Hard Materials

JF - International Journal of Refractory Metals and Hard Materials

ER -

Oxidation resistance and mechanical characterization of silicide coatings on the Nb-18Ti-14Si-9Al alloy

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Keywords

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