Advertisement

Effect of relative density on cyclic oxidation resistance properties of MoSi2

  • Jian-hui Yan (颜建辉)Email author
  • Yi-min Li (李益民)
  • Hou-an Zhang (张厚安)
Article

Abstract

MoSi2 powders were fabricated respectively by mechanical alloying technique and sintering at different temperatures to prepare materials with different relative densities. The relative oxidation behavior of all MoSi2 materials at 1 473 K was investigated by TGA, SEM and XRD. The results show that the “pesting” is not found in all materials after being oxidized for 480 h. The density has no essential relation to the “pesting”. The oxidation curve of specimens with lower density shows two-step oxidation kinetics. Both the first stage (0–1 h) and the second stage (1–480 h) nearly obey linear kinetics, but the oxidation rates are obviously different. The oxidation kinetics of MoSi2 with higher relative density nearly follows parabolic law. The mass gains of MoSi2 with the lowest relative density (78.6%) and the highest relative density (94.8%) are increased by 10.390 and 0.135 mg/cm2, respectively. The oxide scale of materials with lower densities is non-protective and makes the oxygen diffusion easy. A dense scale in the material with higher density is formed, which acts as a diffusion barrier to the oxygen atoms to penetrate into the matrix, showing much better high temperature oxidation resistance. The phases distribution of oxidation scale from the outside to the inside is SiO2→Mo5Si3→MoSi2.

Key words

MoSi2 relative density diffusion oxidation resistance 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. [1]
    VASUDEVAN A K, PETROVIC J J. A comparative overview of molybdenum disilicide composites [J]. Materials Science and Engineering A, 1992, A155: 1–17.CrossRefGoogle Scholar
  2. [2]
    KUCHINO J, KUROKAWA K, SHIBAYAMA T. Effect of microstructure on oxidation resistance of MoSi2 fabricated by spark plasma sintering [J]. Vacuum, 2004, 73: 623–628.CrossRefGoogle Scholar
  3. [3]
    MITRA R, RAMA R V V. Effect of minor alloying with Al on oxidation behaviour of MoSi2 at 1 200 °C [J]. Materials Science and Engineering A, 1999, A260: 146–160.CrossRefGoogle Scholar
  4. [4]
    MARUYAMA T, YANAGIHARA K. High temperature oxidation and pesting of Mo(Si,A1)2 [J]. Materials Science and Engineering A, 1997, A239/240: 828–841.CrossRefGoogle Scholar
  5. [5]
    LOHFELD S, SCHTZE M. Oxidation behavior of particle reinforced MoSi2 composites at temperature up to 1 700 °C(part I): Literature review [J]. Materials and Corrosion, 2005, 56(2): 93–97.CrossRefGoogle Scholar
  6. [6]
    YAN Jian-hui, LI Yi-min, ZHANG Hou-an, TANG Si-wen. Mechanical properties and high temperature oxidation behavior of La2O3-Mo5Si3/MoSi2 [J]. The Chinese Journal of Nonferrous Metals, 2006, 16(10): 1730–1735. (in Chinese)Google Scholar
  7. [7]
    KUROKAWA K, HOUZUMI H, SAEKI I. Low temperature oxidation of full dense and porous MoSi2 [J]. Materials Science and Engineering A, 1999, A261: 292–299.CrossRefGoogle Scholar
  8. [8]
    NATESAN K, DEDVI S C. Oxidation behavior of molybdenum silicides and their composites [J]. Intermetallics, 2000, 8: 1147–1158.CrossRefGoogle Scholar
  9. [9]
    BERZTISS D A, CERCHIARA R R, GULBRANSEN E A, PETTIT F S. Oxidation of MoSi2 and comparison with other silicide materials [J]. Materials Science and Engineering A, 1992, A155: 165–181.CrossRefGoogle Scholar
  10. [10]
    YAN Jian-hui, ZHANG Hou-an, LI Yi-min. Oxidation behaviors of MoSi2 with different density at high temperature of 700–1 200 °C [J]. Chinese Journal of Rare Metals, 2007, 31(1): 18–21.(in Chinese)MathSciNetGoogle Scholar
  11. [11]
    ZHANG Fang, ZHANG Lan-ting, SHAN Ai-dang, WU Jian-sheng. Oxidation of stoichiometric poly-and single-crystalline MoSi2 at 773 K [J]. Intermetallics, 2006, 14: 406–411.CrossRefGoogle Scholar
  12. [12]
    CHOU T C, NEIH T G. Mechanism of MoSi2 pest during low temperature oxidation [J]. Journal of Materials Research, 1993, 8(1): 214–226.CrossRefGoogle Scholar
  13. [13]
    LIU Y Q, SHAO G, TSAKIROPOLOS P. On the oxidation behaviour of MoSi2 [J]. Intermetallics, 2001, 9: 125–136.CrossRefGoogle Scholar
  14. [14]
    BARTLETT R W, MARSUOKA, TAKAHASHI H. High temperature oxidation of molybdenum disilicide [J]. Journal of the American Ceramic Society, 1965, 48(11): 551–552.CrossRefGoogle Scholar
  15. [15]
    CHANG Chun, LI Mu-sheng, CHEN Chuan-zhong, TIAN Lei-yan. Microstructure of high-temperature oxidation layer of molybdenum disilicide [J]. Acta Metallurgica Sinica, 2003, 39(2): 126–130. (in Chinese)Google Scholar

Copyright information

© Central South University Press and Springer-Verlag GmbH 2008

Authors and Affiliations

  • Jian-hui Yan (颜建辉)
    • 1
    • 2
    Email author
  • Yi-min Li (李益民)
    • 1
  • Hou-an Zhang (张厚安)
    • 2
  1. 1.State Key Laboratory of Powder MetallurgyCentral South UniversityChangshaChina
  2. 2.College of Electromechanical EngineeringHunan University of Science and TechnologyXiangtanChina

Personalised recommendations