Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7893505 | Corrosion Science | 2018 | 9 Pages |
Abstract
Si3N4 fibers prepared from polycarbosliane are exposed in dry and wet air respectively from 800 to 1300â¯Â°C for up to 1â¯h. After dry air oxidation, an uniform SiO2 coating doped with nitrogen is formed on fiber surface. However, the coating obtained in wet air is much thicker with more complex microstructure containing sub-layers of N-doped SiO2, near stoichiometric Si3N4 and graphite-like nanoribbons. Activation energy for oxidation in wet and dry air is determined as 108 and 152â¯kJâ¯molâ1, respectively. Both of the values are lower than the known Si3N4 materials with Ea of 259-485â¯kJâ¯molâ1.
Related Topics
Physical Sciences and Engineering
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Authors
Siwei Li, Yongcai Li, Hongrui Xiao, Xiangdong Li, Qi Wang, Ming Tang, Huibin Tu, Jinqiu Huang, Lifu Chen, Zhiyang Yu,