期刊
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
卷 37, 期 7, 页码 2657-2665出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2017.02.022
关键词
Thermal barrier coating; CMAS; Gadolinium oxide; Apatite; Cyclosilicate
资金
- French Defense Research Organization (DGA)
Improvement of the calcium-magnesium aluminosilicate (CMAS) infiltration mitigation concept in thermal barrier coatings (TBC) requires fundamental data on thermochemical reaction involving rare-earth oxide candidate as ZrO2 alloying element. This study investigates, through a model approach, Gd2O3 dissolution at 1200 degrees C in a synthetic model CAS melt (64.4SiO(2)-9.3Al(2)O(3)-26.4CaO mol. %) and the stability of the precipitated Gd-apatite Ca2Gd8(SiO4)(6)O-2 and Ca3Gd2(Si3O9)(2) cyclosilicate phases. The two Gd-rich silicates have been synthesized by solid-state reaction and then characterized by X-ray diffraction (XRD) and energy dispersive X-ray spectroscopy (EDS). The interactions of Gd2O3, Gd-apatite and Gd-cyclosilicate with CAS have been observed by scanning electron microscope (SEM) after various times of contact at 1200 degrees C, giving information about dissolution/precipitation processes. Dissolution kinetics has been evaluated by electron probe microanalysis (EPMA) measurements in the CAS melt. A discussion is finally provided concerning the thermodynamic stability of all phases of the system and confronted with kinetics considerations. (C) 2017 Elsevier Ltd. All rights reserved.
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