| Kinetics and mechanism of hot corrosion of gamma-Y(2)Si(2)O(7) in thin-film Na(2)SO(4) molten salt |
| Z. Sun; M. Li; Y. Zhou
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| 2008
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| 发表期刊 | Journal of the American Ceramic Society
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| ISSN | 0002-7820
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| 卷号 | 91期号:7页码:2236-2242 |
| 摘要 | gamma-Y(2)Si(2)O(7) is a promising candidate material both for high-temperature structural applications and as an environmental/thermal barrier coating material due to its unique properties such as high melting point, machinability, thermal stability, low linear thermal expansion coefficient (3.9 x 10(-6)/K, 200 degrees-1300 degrees C), and low thermal conductivity (< 3.0 W/m.K above 300 degrees C). The hot corrosion behavior of gamma-Y(2)Si(2)O(7) in thin-film molten Na(2)SO(4) at 850 degrees-1000 degrees C for 20 h in flowing air was investigated using a thermogravimetric analyzer (TGA) and a mass spectrometer (MS). gamma-Y(2)Si(2)O(7) exhibited good resistance against Na(2)SO(4) molten salt. The kinetic curves were well fitted by a paralinear equation: the linear part was caused by the evaporation of Na(2)SO(4) and the parabolic part came from gas products evolved from the hotcorrosion reaction. A thin silica film formed under the corrosion scale was the key factor for retarding the hot corrosion. The apparent activation energy for the corrosion of gamma-Y(2)Si(2)O(7) in Na(2)SO(4) molten salt with flowing air was evaluated to be 255 kJ/mol. |
| 部门归属 | [sun, ziqi; li, meishuan; zhou, yanchun] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china. [sun, ziqi] chinese acad sci, grad sch, beijing 100039, peoples r china.;zhou, y (reprint author), chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china;yczhou@imr.ac.cn
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| 关键词 | Silicon-nitride
Ceramics
Solubility
Sulfate
Si3n4
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| URL | 查看原文
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| WOS记录号 | WOS:000257709100027
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| 引用统计 |
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| 文献类型 | 期刊论文
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| 条目标识符 | http://ir.imr.ac.cn/handle/321006/33091
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| 专题 | 中国科学院金属研究所
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推荐引用方式
GB/T 7714 |
Z. Sun,M. Li,Y. Zhou. Kinetics and mechanism of hot corrosion of gamma-Y(2)Si(2)O(7) in thin-film Na(2)SO(4) molten salt[J]. Journal of the American Ceramic Society,2008,91(7):2236-2242.
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| APA |
Z. Sun,M. Li,&Y. Zhou.(2008).Kinetics and mechanism of hot corrosion of gamma-Y(2)Si(2)O(7) in thin-film Na(2)SO(4) molten salt.Journal of the American Ceramic Society,91(7),2236-2242.
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| MLA |
Z. Sun,et al."Kinetics and mechanism of hot corrosion of gamma-Y(2)Si(2)O(7) in thin-film Na(2)SO(4) molten salt".Journal of the American Ceramic Society 91.7(2008):2236-2242.
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