Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1622328 | Journal of Alloys and Compounds | 2009 | 5 Pages |
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 °C 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 cmâ2. 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 â0.007 mg cmâ2, 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.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Peizhong Feng, Xiaohong Wang, Yaqiong He, Yinghuai Qiang,