Hot corrosion behaviour of barium-strontium aluminosilicates in a molten Na₂SO₄ environment

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• 作者：Fengrui Jiang ; Laifei Cheng ; Yiguang Wang ; ^{wangyiguang@nwpu.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Xuanxuan Huang
• 关键词：Hot corrosion ; Barium-strontium aluminosilicate ; Na2SO4 ; EBC
• 刊名：Journal of the European Ceramic Society
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：37
• 期：2
• 页码：823-832
• 全文大小：7576 K

文摘

The hot corrosion behaviour of barium-strontium aluminosilicates (B_1−xS_xAS) attacked by Na₂SO₄ was investigated in the temperature range from 900 to 1100 °C and the weight change was measured as a function of the corrosion time. The surfaces and cross-sections of the corroded samples were observed by scanning electron microscopy in backscattered electron mode and energy-dispersive X-ray spectroscopy. The phase composition was characterized by X-ray diffraction. The results indicate that the hot corrosion of B_1−xS_xAS by molten Na₂SO₄ was controlled by a diffusion-reaction mechanism. The strontium and/or barium cations diffused out of their aluminosilicate network, and the vacant sites were filled by sodium cations diffusing into the structure to form a NaAlSiO₄ on the top. Due to their smaller radius, the strontium atoms showed a faster diffusion rate than the barium atoms. The corrosion depth significantly increased with the temperature and the strontium concentration in the B_1−xS_xAS.