Improving oxidation resistance of MoSi2 coating by reinforced with Al2O3 whiskers

Lu Wang; Qiangang Fu; Fengling Zhao

doi:10.1016/j.intermet.2017.12.023

Improving oxidation resistance of MoSi₂ coating by reinforced with Al₂O₃ whiskers

Lu Wang, Qiangang Fu, Fengling Zhao

School of Materials Sience and Engineering

Northwestern Polytechnical University Xian

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

38 Scopus citations

Abstract

To improve the toughness and oxidation resistance of MoSi₂ coating, Al₂O₃ whiskers and Al₂O₃ particles were introduced respectively. The geometry of Al₂O₃ significantly influence the toughening effect on suppressing crack extension. After oxidation at 1450 °C for 76 h, MoSi₂ coating reinforced with 1% Al₂O₃ whiskers lost mass of only 0.17% and remained integrity, compared to the particles with 0.70% and destroyed by penetrative cracks, exhibiting favorable oxidation resistance. The improved property resulted from the crack-healing by Al₂O₃·21SiO₂ glass occurred during oxidation and better toughening effect by the whiskers to restrain crack growth. Noticeable, increased Al₂O₃ content made the coatings porous remarkably, and also decrease the crack resistance during oxidation, led to degradation of the ability to resist accelerated oxidation erosion.

Original language	English
Pages (from-to)	106-113
Number of pages	8
Journal	Intermetallics
Volume	94
DOIs	https://doi.org/10.1016/j.intermet.2017.12.023
State	Published - Mar 2018

Keywords

AlO
MoSi
Oxidation
Reinforce
Toughness
Whisker

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10.1016/j.intermet.2017.12.023

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title = "Improving oxidation resistance of MoSi2 coating by reinforced with Al2O3 whiskers",

abstract = "To improve the toughness and oxidation resistance of MoSi2 coating, Al2O3 whiskers and Al2O3 particles were introduced respectively. The geometry of Al2O3 significantly influence the toughening effect on suppressing crack extension. After oxidation at 1450 °C for 76 h, MoSi2 coating reinforced with 1% Al2O3 whiskers lost mass of only 0.17% and remained integrity, compared to the particles with 0.70% and destroyed by penetrative cracks, exhibiting favorable oxidation resistance. The improved property resulted from the crack-healing by Al2O3·21SiO2 glass occurred during oxidation and better toughening effect by the whiskers to restrain crack growth. Noticeable, increased Al2O3 content made the coatings porous remarkably, and also decrease the crack resistance during oxidation, led to degradation of the ability to resist accelerated oxidation erosion.",

keywords = "AlO, MoSi, Oxidation, Reinforce, Toughness, Whisker",

author = "Lu Wang and Qiangang Fu and Fengling Zhao",

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doi = "10.1016/j.intermet.2017.12.023",

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AU - Wang, Lu

AU - Fu, Qiangang

AU - Zhao, Fengling

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N2 - To improve the toughness and oxidation resistance of MoSi2 coating, Al2O3 whiskers and Al2O3 particles were introduced respectively. The geometry of Al2O3 significantly influence the toughening effect on suppressing crack extension. After oxidation at 1450 °C for 76 h, MoSi2 coating reinforced with 1% Al2O3 whiskers lost mass of only 0.17% and remained integrity, compared to the particles with 0.70% and destroyed by penetrative cracks, exhibiting favorable oxidation resistance. The improved property resulted from the crack-healing by Al2O3·21SiO2 glass occurred during oxidation and better toughening effect by the whiskers to restrain crack growth. Noticeable, increased Al2O3 content made the coatings porous remarkably, and also decrease the crack resistance during oxidation, led to degradation of the ability to resist accelerated oxidation erosion.

AB - To improve the toughness and oxidation resistance of MoSi2 coating, Al2O3 whiskers and Al2O3 particles were introduced respectively. The geometry of Al2O3 significantly influence the toughening effect on suppressing crack extension. After oxidation at 1450 °C for 76 h, MoSi2 coating reinforced with 1% Al2O3 whiskers lost mass of only 0.17% and remained integrity, compared to the particles with 0.70% and destroyed by penetrative cracks, exhibiting favorable oxidation resistance. The improved property resulted from the crack-healing by Al2O3·21SiO2 glass occurred during oxidation and better toughening effect by the whiskers to restrain crack growth. Noticeable, increased Al2O3 content made the coatings porous remarkably, and also decrease the crack resistance during oxidation, led to degradation of the ability to resist accelerated oxidation erosion.

KW - AlO

KW - MoSi

KW - Oxidation

KW - Reinforce

KW - Toughness

KW - Whisker

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Improving oxidation resistance of MoSi₂ coating by reinforced with Al₂O₃ whiskers

Abstract

Keywords

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