Effect of Al2O3 on the densification and oxidation behavior of SiC coating for carbon/carbon composites

Chunyu Cheng; Hejun Li; Qiangang Fu; Liping Guo

doi:10.1016/j.ceramint.2018.04.072

Effect of Al₂O₃ on the densification and oxidation behavior of SiC coating for carbon/carbon composites

Chunyu Cheng, Hejun Li, Qiangang Fu, Liping Guo

School of Materials Sience and Engineering

Northwestern Polytechnical University Xian

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

17 Scopus citations

Abstract

A silicon carbide (SiC) coating was prepared on carbon/carbon (C/C) composites by pack cementation using Si, C and Al₂O₃ powers as raw materials. The role of Al₂O₃ on the densification of the SiC coating was investigated. The results show that the densification and thickness of the SiC coating obviously increase with the increase of Al₂O₃ content, which is attributed to the enhanced material transport through liquid Al₂O₃ at high temperature. Moreover, to study the effect of Al₂O₃ on the oxidation behavior of SiC coating itself at 1773 K in air, the synthetic SiC powders by pack cementation were sintered. The results present that after oxidation for 40 h, only a few holes are observed in the generated glass layer of the SiC ceramic without Al₂O₃, while more holes appear in the surface of the oxidized Al₂O₃ doped SiC ceramic, owning to the doped Al atom destroying the SiO₂ network and causing the permeability of oxygen to increase.

Original language	English
Pages (from-to)	12702-12708
Number of pages	7
Journal	Ceramics International
Volume	44
Issue number	11
DOIs	https://doi.org/10.1016/j.ceramint.2018.04.072
State	Published - 1 Aug 2018

Keywords

AlO-SiC coating
First-principle calculation
Microstructure
Oxidation

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title = "Effect of Al2O3 on the densification and oxidation behavior of SiC coating for carbon/carbon composites",

abstract = "A silicon carbide (SiC) coating was prepared on carbon/carbon (C/C) composites by pack cementation using Si, C and Al2O3 powers as raw materials. The role of Al2O3 on the densification of the SiC coating was investigated. The results show that the densification and thickness of the SiC coating obviously increase with the increase of Al2O3 content, which is attributed to the enhanced material transport through liquid Al2O3 at high temperature. Moreover, to study the effect of Al2O3 on the oxidation behavior of SiC coating itself at 1773 K in air, the synthetic SiC powders by pack cementation were sintered. The results present that after oxidation for 40 h, only a few holes are observed in the generated glass layer of the SiC ceramic without Al2O3, while more holes appear in the surface of the oxidized Al2O3 doped SiC ceramic, owning to the doped Al atom destroying the SiO2 network and causing the permeability of oxygen to increase.",

keywords = "AlO-SiC coating, First-principle calculation, Microstructure, Oxidation",

author = "Chunyu Cheng and Hejun Li and Qiangang Fu and Liping Guo",

note = "Publisher Copyright: {\textcopyright} 2018",

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doi = "10.1016/j.ceramint.2018.04.072",

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T1 - Effect of Al2O3 on the densification and oxidation behavior of SiC coating for carbon/carbon composites

AU - Cheng, Chunyu

AU - Li, Hejun

AU - Fu, Qiangang

AU - Guo, Liping

PY - 2018/8/1

Y1 - 2018/8/1

N2 - A silicon carbide (SiC) coating was prepared on carbon/carbon (C/C) composites by pack cementation using Si, C and Al2O3 powers as raw materials. The role of Al2O3 on the densification of the SiC coating was investigated. The results show that the densification and thickness of the SiC coating obviously increase with the increase of Al2O3 content, which is attributed to the enhanced material transport through liquid Al2O3 at high temperature. Moreover, to study the effect of Al2O3 on the oxidation behavior of SiC coating itself at 1773 K in air, the synthetic SiC powders by pack cementation were sintered. The results present that after oxidation for 40 h, only a few holes are observed in the generated glass layer of the SiC ceramic without Al2O3, while more holes appear in the surface of the oxidized Al2O3 doped SiC ceramic, owning to the doped Al atom destroying the SiO2 network and causing the permeability of oxygen to increase.

AB - A silicon carbide (SiC) coating was prepared on carbon/carbon (C/C) composites by pack cementation using Si, C and Al2O3 powers as raw materials. The role of Al2O3 on the densification of the SiC coating was investigated. The results show that the densification and thickness of the SiC coating obviously increase with the increase of Al2O3 content, which is attributed to the enhanced material transport through liquid Al2O3 at high temperature. Moreover, to study the effect of Al2O3 on the oxidation behavior of SiC coating itself at 1773 K in air, the synthetic SiC powders by pack cementation were sintered. The results present that after oxidation for 40 h, only a few holes are observed in the generated glass layer of the SiC ceramic without Al2O3, while more holes appear in the surface of the oxidized Al2O3 doped SiC ceramic, owning to the doped Al atom destroying the SiO2 network and causing the permeability of oxygen to increase.

KW - AlO-SiC coating

KW - First-principle calculation

KW - Microstructure

KW - Oxidation

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SP - 12702

EP - 12708

JO - Ceramics International

JF - Ceramics International

IS - 11

ER -

Effect of Al₂O₃ on the densification and oxidation behavior of SiC coating for carbon/carbon composites

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Keywords

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