Isothermal and cyclic oxidation behaviour of hot-pressed MSi2 compounds (with M = V,Ti, Cr) |
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| Affiliation: | 1. Department of Emergency Medicine, Wan Fang Hospital, Taipei Medical University, Taipei, Taiwan;2. Division of infectious Diseases, Department of Internal Medicine, Wan Fang Hospital, Taipei Medical University, Taipei, Taiwan;3. Department of Pulmonary and Critical Care Medicine, Wan Fang Hospital, Taipei Medical University, Taipei, Taiwan;4. Department of Internal Medicine, Pathology and Laboratory Medicine, Taipei Veterans General Hospital, National Yang-Ming University, Taipei, Taiwan;5. Department of Emergency and Critical Medicine, Taipei Medical University-Wan Fang Hospital, Taipei, Taiwan;6. Department of Internal Medicine, Far Eastern Memorial Hospital, Taipei, Taiwan;7. Department of Internal Medicine, Tri-Service General Hospital, National Defense Medical Center (NDMC), Taipei, Taiwan;8. Department of Internal Medicine, National Cheng-Kung University Hospital, Tainan, Taiwan;9. School of Medical Technology, National Cheng-Kung University College of Medicine, Tainan, Taiwan;10. Department of Internal Medicine, Kaohsiung Medical University Hospital, and Graduate Institute of Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan;11. Department of Internal Medicine, Kaohsiung Veterans General Hospital, Kaoshiung, Taiwan;12. Department of Internal Medicine, Kaohsiung Chang Gung Memorial Hospital, Chang Gung Medical College, Kaohsiung, Taiwan;13. Department of Laboratory Medicine and Internal Medicine, Chung Shan Medical and Dental University, Taichung, Taiwan;14. Division of Infectious Diseases, Department of Internal Medicine, Taipei Veterans General Hospital, Taipei, Taiwan;15. Department of Emergency and Critical Care Medicine, Taipei Municipal WanFang Hospital, Taipei Medical University, Taipei, Taiwan;p. Departments of Laboratory Medicine and Internal Medicine, National Taiwan University Hospital, Taipei, Taiwan;1. Institute of Materials, China Academy of Engineering Physics, 9 Huafeng Street, Jiangyou, Mianyang 621908, China;2. College of Material Science and Engineering, Chongqing University, 174 Shazheng Street, Chongqing 400030, China |
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| Abstract: | The oxidation resistance of MSi2 compounds with M = V, Ti, Cr was investigated from 450 to 950 °C in air under isothermal and cyclic conditions. Vanadium, chromium and titanium disilicide were not subjected to the pest phenomenon at 650 °C over 800 1-h cycles. The results demonstrated very low weight gains regardless of the testing conditions. Oxidation tests were also performed over long duration (1000 h) to identify the oxidation products. The MSi2 compounds were all subjected to the simultaneous oxidation of M and Si despite the formation of a protective silica scale. Increasing the duration of oxidation enhanced the protective properties of the silica scale. Therefore, short-term measurements (by thermogravimetry) did not allow an extrapolation of the MSi2 lifetime. The formation of molten V2O5 induced a higher oxidation rate of VSi2 and delayed the establishment of the protective silica scale compared with CrSi2 and TiSi2. |
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| Keywords: | A Intermetallics B Oxidation C Powder metallurgy D Microstructure |
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