Interaction of Gd2Si2O7 with CMAS melts for environmental barrier coatings

材料科学 硅酸盐 图层(电子) 磷灰石 分层(地质) 复合材料 化学工程 矿物学 地质学 化学 陶瓷 工程类 俯冲 构造学 古生物学
作者
Seung‐Hyeon Kim,Nobuo Nagashima,Yoshitaka Matsushita,Byung‐Koog Jang
出处
期刊:Journal of The European Ceramic Society [Elsevier BV]
卷期号:43 (2): 593-599 被引量:9
标识
DOI:10.1016/j.jeurceramsoc.2022.10.040
摘要

Environmental barrier coatings (EBCs) prevent the oxidation of ceramic matrix composites (CMC), which are used as components in gas turbines. However, EBCs deteriorate more rapidly in real environments, molten silicate deposits accelerate the deterioration of EBCs. In this study, high-temperature behavior sintered Gd 2 Si 2 O 7 with calcia-magnesia-alumina-silica (CMAS) melt at 1400°C for 0.5, 2, 12, 48, and 100 h was investigated. HT-XRD results showed that at 1300°C, CMAS and Gd 2 Si 2 O 7 chemically reacted to form Ca 2 Gd 8 (SiO 4 ) 6 O 2 (apatite). The reaction layer became thicker as the heat-treatment time increased, and the thickness of the reaction layer has increased following a parabolic curve. With the extension of the reaction time from 0.5 to 100 h, the thickness of the reaction layer increased from approximately 98 to 315 μm. It was confirmed that Ca 2 Gd 8 (SiO 4 ) 6 O 2 grew vertically on the Gd 2 Si 2 O 7 surface. Vertical and horizontal cracks were found after reacting at 1400°C for 100 h, but no interfacial delamination occurred in this study. In addition, the effects of CaO:SiO 2 molar ratios, monosilicates (RE 2 SiO 5 ) and disilicates (RE 2 Si 2 O 7 ), heat-treatment time, and cation size were determined and compared with the results of previous studies (Gd 2 SiO 5, Yb 2 SiO 5, and Er 2 Si 2 O 7 ).
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