Reaction between environmental barrier coatings material Er2Si2O7 and a calcia-magnesia-alumina-silica melt
Reaction between environmental barrier coatings material Er2Si2O7 and a calcia-magnesia-alumina-silica melt
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DOI：
10.1016/j.ceramint.2022.03.001
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发表时间：
2022-03
影响因子：
5.2
通讯作者：
Seung-Hyeon Kim;C. Fisher;N. Nagashima;Y. Matsushita;B. Jang
中科院分区：
文献类型：
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作者：
Seung-Hyeon Kim;C. Fisher;N. Nagashima;Y. Matsushita;B. Jang
通过研究烧结二硅酸铒（Er 2Si 2 O 7）在合成钙镁铝硅（CMAS）熔体中的高温腐蚀行为，评价了其作为燃气轮机涡轮机环境屏障涂层（EBC）的适用性。采用放电等离子烧结法在1400 °C烧结20 min制备了Er 2Si 2 O 7。腐蚀测试通过用CMAS涂覆烧结Er 2Si 2 O 7颗粒并将其加热至1400 °C持续2、12和48 h来进行。采用高温X射线衍射、扫描电子显微镜和能量色散X射线分析对反应产物进行了鉴定和分析。发现这两种材料发生化学反应，在界面形成磷灰石相Ca 2 Er 8（SiO 4）6 O2。Ca 2 Er 8（SiO 4）6 O2晶粒具有垂直于Er 2Si 2 O 7表面的片状形貌;反应层随着热处理时间的增加而增厚，暴露48 h后的厚度约为2 h后厚度的3倍。
The suitability of sintered erbium disilicate (Er2Si2O7) as an environmental barrier coatings (EBCs) for gas turbine applications was assessed by characterizing its high-temperature corrosion behavior in contact with a synthetic calcia-magnesia-alumina-silica (CMAS) melt. Er2Si2O7was fabricated using spark plasma sintering at 1400 °C for 20 min. Corrosion tests were performed by coating sintered Er2Si2O7pellets with CMAS and heating them to 1400 °C for 2, 12, and 48 h. High-temperature X-ray diffraction, scanning electron microscopy, and energy-dispersive X-ray analysis were used to identify and analyze the reaction products. The two materials were found to react chemically to form an apatite phase, Ca2Er8(SiO4)6O2, at their interface. The Ca2Er8(SiO4)6O2grains were observed to have shard-like morphologies oriented perpendicular to the Er2Si2O7surface; the reaction layer thickened with increasing heat-treatment time, with the thickness after exposure for 48 h approximately three times the thickness after 2 h.