Fabrication of SiCN-Sc2Si2O7 coatings on C/SiC composites at low temperatures

Jia Liu; Litong Zhang; Juan Yang; Laifei Cheng; Yiguang Wang

doi:10.1016/j.jeurceramsoc.2011.09.029

Fabrication of SiCN-Sc₂Si₂O₇ coatings on C/SiC composites at low temperatures

Jia Liu, Litong Zhang, Juan Yang, Laifei Cheng, Yiguang Wang

School of Materials Sience and Engineering

Northwestern Polytechnical University Xian

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

39 Scopus citations

Abstract

SiCN-Sc₂Si₂O₇ environmental barrier coatings were fabricated on the surface of C/SiC composites at low temperatures by adding Li₂CO₃ as sintering aids. With this addition, the fabrication temperature could be lowered about 100-200°C. The shrinkage of the polysilazane-Sc₂Si₂O₇ bars with and without Li₂CO₃ was tested by dilatometer. The results indicate that the shrinkage speed of the polysilazane-Sc₂Si₂O₇ bar with Li₂CO₃ is faster than the one without Li₂CO₃, indicating that the Li₂CO₃ greatly promotes the sintering of polysilazane-Sc₂Si₂O₇. Water-vapor corrosion behavior of the SiCN-Sc₂Si₂O₇ coated C/SiC composites was carried out at 1250°C. The results reveal that the SiCN-Sc₂Si₂O₇ coatings can effectively protect the C/SiC composites. The corrosion resistance of SiCN-Sc₂Si₂O₇ coatings is not degraded by adding Li₂CO₃.

Original language	English
Pages (from-to)	705-710
Number of pages	6
Journal	Journal of the European Ceramic Society
Volume	32
Issue number	3
DOIs	https://doi.org/10.1016/j.jeurceramsoc.2011.09.029
State	Published - Mar 2012

Keywords

Environmental barrier coatings
Lithium carbonate
ScSiO
Sintering aid

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.1016/j.jeurceramsoc.2011.09.029

Cite this

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title = "Fabrication of SiCN-Sc2Si2O7 coatings on C/SiC composites at low temperatures",

abstract = "SiCN-Sc2Si2O7 environmental barrier coatings were fabricated on the surface of C/SiC composites at low temperatures by adding Li2CO3 as sintering aids. With this addition, the fabrication temperature could be lowered about 100-200°C. The shrinkage of the polysilazane-Sc2Si2O7 bars with and without Li2CO3 was tested by dilatometer. The results indicate that the shrinkage speed of the polysilazane-Sc2Si2O7 bar with Li2CO3 is faster than the one without Li2CO3, indicating that the Li2CO3 greatly promotes the sintering of polysilazane-Sc2Si2O7. Water-vapor corrosion behavior of the SiCN-Sc2Si2O7 coated C/SiC composites was carried out at 1250°C. The results reveal that the SiCN-Sc2Si2O7 coatings can effectively protect the C/SiC composites. The corrosion resistance of SiCN-Sc2Si2O7 coatings is not degraded by adding Li2CO3.",

keywords = "Environmental barrier coatings, Lithium carbonate, ScSiO, Sintering aid",

author = "Jia Liu and Litong Zhang and Juan Yang and Laifei Cheng and Yiguang Wang",

year = "2012",

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doi = "10.1016/j.jeurceramsoc.2011.09.029",

language = "英语",

volume = "32",

pages = "705--710",

journal = "Journal of the European Ceramic Society",

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T1 - Fabrication of SiCN-Sc2Si2O7 coatings on C/SiC composites at low temperatures

AU - Liu, Jia

AU - Zhang, Litong

AU - Yang, Juan

AU - Cheng, Laifei

AU - Wang, Yiguang

PY - 2012/3

Y1 - 2012/3

N2 - SiCN-Sc2Si2O7 environmental barrier coatings were fabricated on the surface of C/SiC composites at low temperatures by adding Li2CO3 as sintering aids. With this addition, the fabrication temperature could be lowered about 100-200°C. The shrinkage of the polysilazane-Sc2Si2O7 bars with and without Li2CO3 was tested by dilatometer. The results indicate that the shrinkage speed of the polysilazane-Sc2Si2O7 bar with Li2CO3 is faster than the one without Li2CO3, indicating that the Li2CO3 greatly promotes the sintering of polysilazane-Sc2Si2O7. Water-vapor corrosion behavior of the SiCN-Sc2Si2O7 coated C/SiC composites was carried out at 1250°C. The results reveal that the SiCN-Sc2Si2O7 coatings can effectively protect the C/SiC composites. The corrosion resistance of SiCN-Sc2Si2O7 coatings is not degraded by adding Li2CO3.

AB - SiCN-Sc2Si2O7 environmental barrier coatings were fabricated on the surface of C/SiC composites at low temperatures by adding Li2CO3 as sintering aids. With this addition, the fabrication temperature could be lowered about 100-200°C. The shrinkage of the polysilazane-Sc2Si2O7 bars with and without Li2CO3 was tested by dilatometer. The results indicate that the shrinkage speed of the polysilazane-Sc2Si2O7 bar with Li2CO3 is faster than the one without Li2CO3, indicating that the Li2CO3 greatly promotes the sintering of polysilazane-Sc2Si2O7. Water-vapor corrosion behavior of the SiCN-Sc2Si2O7 coated C/SiC composites was carried out at 1250°C. The results reveal that the SiCN-Sc2Si2O7 coatings can effectively protect the C/SiC composites. The corrosion resistance of SiCN-Sc2Si2O7 coatings is not degraded by adding Li2CO3.

KW - Environmental barrier coatings

KW - Lithium carbonate

KW - ScSiO

KW - Sintering aid

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