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À´Ô´£ºJournal of alloys and compounds
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Accession number: 20091011948319
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Accession number:  20091011948319

Title:  Effect of high-temperature preoxidation treatment on the low-temperature oxidation behavior of a MoSi2-based composite at 500 ¡ãC

Authors:  Feng, Peizhong1 ; Wang, Xiaohong1 ; He, Yaqiong1 ; Qiang, Yinghuai1  

Author affiliation:  1  School of Materials Science and Engineering, China University of Mining and Technology, Xuzhou, 221116, China


Corresponding author:  Feng, P. (fengroad@163.com)  

Source title:  Journal of Alloys and Compounds

Abbreviated source title:  J Alloys Compd

Volume:  473

Issue:  1-2

Issue date:  April 3, 2009

Publication year:  2009

Pages:  185-189

Language:  English

ISSN:  09258388

CODEN:  JALCEU

Document type:  Journal article (JA)

Publisher:  Elsevier Ltd, Langford Lane, Kidlington, Oxford, OX5 1GB, United Kingdom

Abstract:  In order to investigate the effect of protective scale formed by high-temperature preoxidation process on the low-temperature oxidation behavior of a MoSi2-based composite, the oxidation experiment at 500 ¡ãC in air was performed by employing X-ray diffraction, scanning electron microscopy and thermo-gravimetric analysis. The results show that the preferred low-temperature oxidation/pest sites are the externally cylindrical face of the sample without high-temperature preoxidation treatment. With the prolonging of oxidation, the pest advances radially in cylinder sample. When the oxidation time reaches 288 h, the mass gain is arrived at 0.466 mg cm-2. A glass protective scale is formed on the surface of material by high-temperature preoxidation treatment. The scale can play a role of barrier layer of oxygen. This results in a reduced rate of low-temperature oxidation, and the pest is restrained. When the oxidation has been for 288 h, the mass gain of high-temperature preoxidation sample is only -0.007 mg cm-2, and the surface microstructure is still smooth, without undergoing the pest oxidation. High-temperature preoxidation treatment can effectively restrain the low-temperature oxidation behavior, and avoid the pest phenomenon of MoSi2-based composite. © 2008 Elsevier B.V. All rights reserved.

Number of references:  15

Main heading:  Oxidation

Controlled terms:  Gravimetric analysis  -  Intermetallics  -  Molybdenum  -  Oxygen  -  Scanning electron microscopy  -  Surface treatment  -  Thermal effects  -  X ray diffraction analysis

Uncontrolled terms:  Barrier layers  -  High temperatures  -  Low temperatures  -  Low-temperature oxidations  -  Mass-gains  -  Molybdenum disilicide  -  Oxidation time  -  Pest oxidations  -  Pest phenomenons  -  Pre oxidations   -  Pre-oxidation process  -  Surface microstructures  -  Thermo-gravimetric analysis  -  X- ray diffractions

Classification code:  802.2 Chemical Reactions  -  804 Chemical Products Generally  -  931 Classical Physics; Quantum Theory; Relativity  -  802 Chemical Apparatus and Plants; Unit Operations; Unit Processes  -  931.2 Physical Properties of Gases, Liquids and Solids  -  933.1.1 Crystal Lattice  -  951 Materials Science  -  931.3 Atomic and Molecular Physics  -  801 Chemistry  -  531 Metallurgy and Metallography  -  531.1 Metallurgy  -  539 Metals Corrosion and Protection; Metal Plating  -  421 Strength of Building Materials; Mechanical Properties  -  543.3 Molybdenum and Alloys  -  641 Heat and Mass Transfer; Thermodynamics  -  741.1 Light/Optics  -  604.2 Machining Operations

DOI:  10.1016/j.jallcom.2008.06.032

Database:  Compendex
3Â¥2011-02-28 14:13:31
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[ Last edited by fengroad on 2011-2-28 at 16:17 ]
5Â¥2011-02-28 16:16:38
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