Microstructural Investigations of Al2O3 Scale Formed on FeCrAl Steel duringHigh Temperature Oxidation in SO₂
2
조회
0
다운로드
1
인용
0
참고문헌
키워드
초록
The results of microstructure observations of the Al₂O₃ scale formed on a Fe-Cr-Al steel during high temperature oxidation in the SO₂ atmosphere are presented. Morphology of the scale has been studied by SEM and TEM techniques. Phase and chemical compositions have been studied by EDX and XRD techniques. The alumina oxide is a primary component of the scale. TEM observations showed that the scale was multilayer. The entire surface of the scale is covered with “whiskers”, which look like very thin platelets and have random orientation. The cross section of a sample shows, that the “whiskers” are approximately 2 μm high, however the compact scale layer on which they reside is 0.2 μm thick. The scale layer was composed mainly of small equiaxial grains and a residual amount of small columnar grains. EDX analysis of the scale surface showed that the any sulfides were found in the formed outer and thin inner scale layer. A phase analysis of the scale formed revealed that it is composed mainly of the θ-Al₂O₃ phase and a residual amount of α-Al₂O₃.
Abstract
The results of microstructure observations of the Al₂O₃ scale formed on a Fe-Cr-Al steel during high temperature oxidation in the SO₂ atmosphere are presented. Morphology of the scale has been studied by SEM and TEM techniques. Phase and chemical compositions have been studied by EDX and XRD techniques. The alumina oxide is a primary component of the scale. TEM observations showed that the scale was multilayer. The entire surface of the scale is covered with “whiskers”, which look like very thin platelets and have random orientation. The cross section of a sample shows, that the “whiskers” are approximately 2 μm high, however the compact scale layer on which they reside is 0.2 μm thick. The scale layer was composed mainly of small equiaxial grains and a residual amount of small columnar grains. EDX analysis of the scale surface showed that the any sulfides were found in the formed outer and thin inner scale layer. A phase analysis of the scale formed revealed that it is composed mainly of the θ-Al₂O₃ phase and a residual amount of α-Al₂O₃.
참고문헌 (13)
- Li Meishuan, "High Temperature Corrosion and Protection Materials", pp.209~ (2000)
- J. Balamin, , Materials Science and Engineering (1997)
- C. Badini, , Surface and Coatings Technology, 135, pp.291~ (2001)
- B. A. Pint, , Solid State Ionics, 78, pp.99~ (1995)
- K. Messaoudi, , Materials Science and Engineering (1998)
- M. Boualam, "Microscopy of Oxidation 2", pp.243~ (1993)
- M. Homa, "Czasopismo Techniczne PK, Z. 2", pp.1~
- E. Adrieu, , Materials Science Forum (1997)
- A. Andoh, , High-Temperature Corrosion and Protection, pp.297~ (2000)
- I. Barin, "Thermochemical Properties of Inorganic Substances Sprinter Verlag" (1977)
- M. Homa, , Materials Science Forum (2004)
- Z. Żurek, , Defect and Diffusion Forum (2005)
- T. F. An, , Oxidation of Metals (2000)