Oxidation Behavior of Si/Mullite/Er(2)SiO(5) New Environmental Barrier Coating at 1350 degree C

Si/Mullite/Er(2)SiO(5) environment barrier coatings (EBCs) were prepared by chemical vapor deposition and plasma spraying on SiC/SiC composites. The oxidation behavior of the coatings at 1350 degree C was investigated, and the structure change of the coatings was analyzed by SEM, EDS and XRD. The re...

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Bibliographic Details
Published inCai liao gong cheng = Journal of materials engineering no. 10; pp. 90 - 95
Main Authors Fan, Jin-Juan, Chang, Zhen-Dong, Tao, Chun-Hu, Wang, Fu-Chi
Format Journal Article
LanguageChinese
Published 01.10.2014
Subjects
Bonding strength
Coating
Diffusion
Failure
Mullite
Oxidation
Silicon
Silicon carbide
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Summary:Si/Mullite/Er(2)SiO(5) environment barrier coatings (EBCs) were prepared by chemical vapor deposition and plasma spraying on SiC/SiC composites. The oxidation behavior of the coatings at 1350 degree C was investigated, and the structure change of the coatings was analyzed by SEM, EDS and XRD. The results show that the oxidation kinetics of the samples coated by Si/Mullite/Er(2)SiO(5) conforms to the logarithm law. The oxidation rate of the samples is high at the early stage of the oxidation duration, and then grows steady with the increase of the oxidation time. The coatings can serve up to 400h at 1350 degree C. The cause for failure of coatings is that the atom O diffused into the bond coat and substrate through the coatings to cause the oxidation of bond coat and substrate, and the bond strength then decreases to cause the peeling of the coating. The cracks perpendicular to the coating surface will be the route of air diffusion from the surface into the bond coat and substrate, and accelerate the oxidation
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ISSN:1001-4381