Hot corrosion Of gamma-Y2Si2O7 in strongly basic Na2CO3 molten salt environment

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	Hot corrosion Of gamma-Y2Si2O7 in strongly basic Na2CO3 molten salt environment
	Z. Q. Sun; M. S. Li; Z. P. Li; Y. C. Zhou
	2008
发表期刊	Journal of the European Ceramic Society
ISSN	0955-2219
卷号	28 期号:1 页码:259-265
摘要	gamma-Y2Si2O7 is a promising candidate both for high temperature structural applications and as thermal barrier coatings due to its unique combination of properties, such as high melting point, good machinability, high thermal stability, low linear thermal expansion coefficient (3.9 x 10(-6) K-1, 25-1400 degrees C) and low thermal conductivity (< 3 W/m K above 300 degrees C). In this work, the hot corrosion behavior of gamma-Y2Si2O7 in strongly basic Na2CO3 molten salt at 850-1000 degrees C for 20 h in flowing air was investigated. In the employed conditions, multi-layer corrosion scales with total thickness less than 90 mu m were formed. At 850-900 degrees C, the outmost layer of the scale was composed of the reprecipitation Of Y2O3, the bottom of a Si-rich Na2O center dot xSiO(2) (x > 3.65) melt layer, and the middle of a NaYSiO4 layer. At 1000 degrees C, the corrosion products turned out to be a mixture of NaY9Si6O26 and Si-rich Na2O center dot xSiO(2) (x > 3.65). In all cases, a thin layer of protective SiO2 formed under the Na2O center dot XSiO2 melt and protected the bulk material from further corrosion. (c) 2007 Elsevier Ltd. All rights reserved.
部门归属	[sun, ziqi; li, meishuan; zhou, yanchun] chinese acad sci, shenyang natl lab mat sci, inst met res, shenyang 110016, peoples r china. [sun, ziqi] chinese acad sci, grad sch, beijing 100039, peoples r china. [li, zhongping] natl key lab adv funct composite mat, beijing 100076, peoples r china.;zhou, yc (reprint author), chinese acad sci, shenyang natl lab mat sci, inst met res, 72 wenhua rd, shenyang 110016, peoples r china;yczhou@imr.ac.cn
关键词	Y2si2o7 Corrosion Silicates Structural Applications Engine Components Yttrium Silicate Coatings Oxidation Protection Alkali Corrosion Si3n4 Ceramics Nitride Composites Na2so4 Solubility Disilicate Mechanism
URL	查看原文
WOS记录号	WOS:000251560900034
引用统计	被引频次：27[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/33092
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	Z. Q. Sun,M. S. Li,Z. P. Li,et al. Hot corrosion Of gamma-Y2Si2O7 in strongly basic Na2CO3 molten salt environment[J]. Journal of the European Ceramic Society,2008,28(1):259-265.
APA	Z. Q. Sun,M. S. Li,Z. P. Li,&Y. C. Zhou.(2008).Hot corrosion Of gamma-Y2Si2O7 in strongly basic Na2CO3 molten salt environment.Journal of the European Ceramic Society,28(1),259-265.
MLA	Z. Q. Sun,et al."Hot corrosion Of gamma-Y2Si2O7 in strongly basic Na2CO3 molten salt environment".Journal of the European Ceramic Society 28.1(2008):259-265.