The influence of different relative density on the cyclic oxidation behaviors of MoSi2 at 1 273 K were studied. "Pesting" was not found in all MoSi2 materials after being oxidized for 480 h. All samples exhibited continuous mass gain during the oxidation process. The mass gains of MoSi2 with the lowest relative density (78.6%) and the highest relative density (94.8%) are increased by 8.15 mg·cm2 and 3.48 mg·cm-2, respectively. The surface of the material with lower relative density formed a loose, porous and discontinuous oxidation scale, which accelerated oxygen diffusion and aggravated the oxidation process. However, a dense scale in the material with higher relative density is formed, which acts a diffusion barrier to the oxygen atoms penetrating into the matrix. The high temperature oxidation resistance of MoSi2 can be improved by increasing its relative density.
参考文献
| [1] | A K Vasudevan;J J Petrovic .A Comparative Overview of Molybdenum Disilicide Composites[J].Materials Science and Engineering,1992,A155:1-17. |
| [2] | K Kurokawa;H Houzumi;I Saeki .Low Temperature Oxidation of Full Dense and Porous MoSi2[J].Materials Science and Engineering,1999,A261:292-299. |
| [3] | S. Lohfeld;M. Schutze .Oxidation behaviour of particle reinforced MoSi{sub}2 composites at temperatures up to 1700℃ Part I: Literature review[J].Materials and Corrosion,2005(2):93-97. |
| [4] | S. Lohfeld;M. Schutze;A. Bohm;V. Guther;R. Rix;R. Scholl .Oxidation behaviour of particle reinforced MoSi{sub}2 composites at temperatures up to 1700℃ Part II: Initial screening of the oxidation behaviour of MoSi{sub}2 composites[J].Materials and Corrosion,2005(3):149-158. |
| [5] | H A Zhang;S W Li;C G Long .Study of Low-temperature Oxidation Process of MoSi2-based Composites[J].Journal of Functional Materials,2000,14(01):69-71. |
| [6] | Kuchino J;Kurokawa K;Shibayama T;Takahashi H .Effect of microstructure on oxidation resistance of MoSi2 fabricated by spark plasma sintering[J].Vacuum: Technology Applications & Ion Physics: The International Journal & Abstracting Service for Vacuum Science & Technology,2004(3/4):623-628. |
| [7] | C G Mckamey;P F Tortorelli;J H Devan .Study of Pest Oxidation in Polycrystalline MoSi2[J].Journal of Materials Research,1992,7(10):2747-2755. |
| [8] | K Hansson;M Halvarsson;J E Tang .Oxidation Behaviour of a MoSi2-based Composite in Different Atmosphere in the Low Temperature Range (400-550 ℃)[J].Journal of the Ceramic Society,2004,24:3559-3573. |
| [9] | K. Natesan;S.C. Deevi .Oxidation behavior of molybdenum suicides and their composites[J].Intermetallics,2000(9/11):1147-1158. |
| [10] | D A Berztiss;R R Cerchiara;E A Gulbransen et al.Oxidation of MoSi2 and Ccomparison with Other Silicide Materials[J].Materials Science and Engineering,1992,A155:165-181. |
| [11] | R W Bartlett;Marsuoka;H Takahashi .High Temperature Oxidation of Molybdenum Disilicide[J].Journal of the American Ceramic Society,1965,48(11):551-552. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%