Oxidation behavior and microstructural evolution of plasma sprayed La2O3-MoSi2-SiC coating on carbon/carbon composites

Changcong Wang; Kezhi Li; Caixia Huo; Qinchuan He; Xiaohong Shi

doi:10.1016/j.surfcoat.2018.05.038

Oxidation behavior and microstructural evolution of plasma sprayed La₂O₃-MoSi₂-SiC coating on carbon/carbon composites

Changcong Wang, Kezhi Li, Caixia Huo, Qinchuan He, Xiaohong Shi

School of Materials Sience and Engineering

Northwestern Polytechnical University Xian

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

40 Scopus citations

Abstract

Improving the efficiency and service-life of high-temperature coatings in a cost-effective way has always been capturing more attention. In this study, we developed a multiphase La₂O₃-MoSi₂-SiC (LO-MS) composite coating using an efficient supersonic atmospheric plasma spraying (SAPS) to protect carbon/carbon (C/C) composites against oxidation. Isothermal oxidation evaluation of LO-MS coating was carried out at 1473 K and 1773 K. A lower mass loss at 1773 K for 100 h with 6.42 mg·cm⁻² than that of 1473 K with 10.93 mg·cm⁻² indicated that a superior oxidation resistance of LO-MS coating at 1773 K relative to 1473 K, which might be attributed to the decreased viscosity of SiO₂-rich glass scale at 1773 K and their good healing effect for cracks. Moreover, thermogravimetric analysis showed that the LO-MS coating provided a sufficient protection for C/C composites in a wide temperature range from 373 K to 1673 K. The continuous La-Si-O compound scale served as a barrier layer to effectively block the inward infiltration of oxygen.

Original language	English
Pages (from-to)	81-90
Number of pages	10
Journal	Surface and Coatings Technology
Volume	348
DOIs	https://doi.org/10.1016/j.surfcoat.2018.05.038
State	Published - 25 Aug 2018

Keywords

Carbon/carbon composites
Compound scale
Lanthanum oxide
Oxidation resistance

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10.1016/j.surfcoat.2018.05.038

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title = "Oxidation behavior and microstructural evolution of plasma sprayed La2O3-MoSi2-SiC coating on carbon/carbon composites",

abstract = "Improving the efficiency and service-life of high-temperature coatings in a cost-effective way has always been capturing more attention. In this study, we developed a multiphase La2O3-MoSi2-SiC (LO-MS) composite coating using an efficient supersonic atmospheric plasma spraying (SAPS) to protect carbon/carbon (C/C) composites against oxidation. Isothermal oxidation evaluation of LO-MS coating was carried out at 1473 K and 1773 K. A lower mass loss at 1773 K for 100 h with 6.42 mg·cm−2 than that of 1473 K with 10.93 mg·cm−2 indicated that a superior oxidation resistance of LO-MS coating at 1773 K relative to 1473 K, which might be attributed to the decreased viscosity of SiO2-rich glass scale at 1773 K and their good healing effect for cracks. Moreover, thermogravimetric analysis showed that the LO-MS coating provided a sufficient protection for C/C composites in a wide temperature range from 373 K to 1673 K. The continuous La-Si-O compound scale served as a barrier layer to effectively block the inward infiltration of oxygen.",

keywords = "Carbon/carbon composites, Compound scale, Lanthanum oxide, Oxidation resistance",

author = "Changcong Wang and Kezhi Li and Caixia Huo and Qinchuan He and Xiaohong Shi",

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doi = "10.1016/j.surfcoat.2018.05.038",

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T1 - Oxidation behavior and microstructural evolution of plasma sprayed La2O3-MoSi2-SiC coating on carbon/carbon composites

AU - Wang, Changcong

AU - Li, Kezhi

AU - Huo, Caixia

AU - He, Qinchuan

AU - Shi, Xiaohong

PY - 2018/8/25

Y1 - 2018/8/25

N2 - Improving the efficiency and service-life of high-temperature coatings in a cost-effective way has always been capturing more attention. In this study, we developed a multiphase La2O3-MoSi2-SiC (LO-MS) composite coating using an efficient supersonic atmospheric plasma spraying (SAPS) to protect carbon/carbon (C/C) composites against oxidation. Isothermal oxidation evaluation of LO-MS coating was carried out at 1473 K and 1773 K. A lower mass loss at 1773 K for 100 h with 6.42 mg·cm−2 than that of 1473 K with 10.93 mg·cm−2 indicated that a superior oxidation resistance of LO-MS coating at 1773 K relative to 1473 K, which might be attributed to the decreased viscosity of SiO2-rich glass scale at 1773 K and their good healing effect for cracks. Moreover, thermogravimetric analysis showed that the LO-MS coating provided a sufficient protection for C/C composites in a wide temperature range from 373 K to 1673 K. The continuous La-Si-O compound scale served as a barrier layer to effectively block the inward infiltration of oxygen.

AB - Improving the efficiency and service-life of high-temperature coatings in a cost-effective way has always been capturing more attention. In this study, we developed a multiphase La2O3-MoSi2-SiC (LO-MS) composite coating using an efficient supersonic atmospheric plasma spraying (SAPS) to protect carbon/carbon (C/C) composites against oxidation. Isothermal oxidation evaluation of LO-MS coating was carried out at 1473 K and 1773 K. A lower mass loss at 1773 K for 100 h with 6.42 mg·cm−2 than that of 1473 K with 10.93 mg·cm−2 indicated that a superior oxidation resistance of LO-MS coating at 1773 K relative to 1473 K, which might be attributed to the decreased viscosity of SiO2-rich glass scale at 1773 K and their good healing effect for cracks. Moreover, thermogravimetric analysis showed that the LO-MS coating provided a sufficient protection for C/C composites in a wide temperature range from 373 K to 1673 K. The continuous La-Si-O compound scale served as a barrier layer to effectively block the inward infiltration of oxygen.

KW - Carbon/carbon composites

KW - Compound scale

KW - Lanthanum oxide

KW - Oxidation resistance

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SN - 0257-8972

VL - 348

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JO - Surface and Coatings Technology

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ER -

Oxidation behavior and microstructural evolution of plasma sprayed La₂O₃-MoSi₂-SiC coating on carbon/carbon composites

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