研究了(Al，Mn)3Ti-2V和TiAl在900 ℃的(Na, K) 2SO4以及850 ℃的Na2SO4+NaCl熔盐中的热腐蚀行为. 结果表明, (Al，Mn)3Ti-2V在(Na, K) 2SO4中的耐蚀性很好, 腐蚀产物膜很薄, 外层是保护性的Al2O3, 内层是Al2O3+TiO2+TiS的混合膜. 当熔盐中存在NaCl时, (Al，Mn)3Ti-2V的耐蚀性极差, 腐蚀产物的厚度比在(Na, K) 2SO4中大100多倍, 且具有分层结构, 最外层富MnO(含少量Al2O3和TiO2), 第二层为Al2O3+少量TiS, 第三层为TiO2+TiS, 由于不能形成保护性的Al2O3层, 腐蚀产物极易剥落.
Hot corrosion behaviors of (Al, Mn)3Ti-2V and TiAl in (Na, K)2SO4 melt at 900℃ and in Na2SO4+NaCl melt at 850℃ were studied respectively. The cross-sectional morphologies and profiles of elements in the scale formed on (Al, Mn)3Ti-2V show that (Al, Mn)3Ti-2V has excellent hot corrosion resistance in (Na, K)2SO4 melt. The thin scale consists of an outer protective Al2O3 layer and an inner mixture layer of Al2O3, TiO2 and TiS. When NaCl was added in the Na2SO4 salts, however, the hot corrosion resistance of the (Al, Mn)3Ti-2V becomes very poor. The scale is thicker than that in the absence of NaCl by one hundred times of magnitude at least. The scale consists of three layers: an outer layer consisting of porous MnO plus a little Al2O3+TiO2, a middle layer of porous Al2O3 plus trace amount of TiS, and an inner layer of TiO2+TiS.
参考文献
| [1] | |
| [2] | |
| [3] | |
| [4] | |
| [5] | |
| [6] |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%