Influence of Silicon-Modified Al Powders (SiO2@Al) on Anti-oxidation Performance of Al2O3-SiO2 Ceramic Coating for Carbon Steel at High Temperature
Abstract
:1. Introduction
2. Experiment Procedure
2.1. Preparation of Carbon Steel Sample
2.2. Preparation of Modified Al Powders (SiO2@Al)
2.3. Preparation of Coating Slurry
2.4. Evaluation of Anti-oxidation Performance
2.5. Characterization
3. Results and Discussion
3.1. Performance of Coating
3.2. Morphology of Coating
3.3. Protection Mechanism
4. Conclusions
- The Al powders were successfully encapsulated by SiO2 and the SiO2@Al stably existed in the as-prepared alkaline coating slurry. The appropriate proportion of SiO2@Al in the coating was 10%.
- The metallic Al in ASMA melted at 662.85 °C. What generated local high temperature and accelerated the sintering of ceramic raw materials was the exothermal reaction between the melted Al and SiO2 (4Al + 3SiO2 → 3Si + 2Al2O3). The well-sintered structure decreased the inner diffusion rate of oxygen and enhanced the anti-oxidation effect of ASMA during the temperature-rise period.
- The hercynite layer formed within ASMA played a significant role for slowing down the external diffusion of iron ions due to the lower fraction of Fe2+ occupied the octahedral site, which facilitated the improvement of anti-oxidation ability at 1250 °C.
Author Contributions
Funding
Conflicts of Interest
References
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No. | Al2O3 | Sodium Silicate Solution (40 wt %) | SiO2@Al | Surface Active Agent Sodium Polyacrylate | H2O |
---|---|---|---|---|---|
1 | 70.5 | 23.5 | 0 | 4 | 2 |
2 | 66 | 21 | 5 | 4 | 4 |
3 | 62 | 18.5 | 10 | 4 | 5.5 |
4 | 58 | 16 | 15 | 4 | 7 |
5 | 54 | 13.5 | 20 | 4 | 8.5 |
6 | 50 | 11 | 25 | 4 | 10 |
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Yu, B.; Fu, G.; Cui, Y.; Zhang, X.; Tu, Y.; Du, Y.; Zuo, G.; Ye, S.; Wei, L. Influence of Silicon-Modified Al Powders (SiO2@Al) on Anti-oxidation Performance of Al2O3-SiO2 Ceramic Coating for Carbon Steel at High Temperature. Coatings 2019, 9, 167. https://doi.org/10.3390/coatings9030167
Yu B, Fu G, Cui Y, Zhang X, Tu Y, Du Y, Zuo G, Ye S, Wei L. Influence of Silicon-Modified Al Powders (SiO2@Al) on Anti-oxidation Performance of Al2O3-SiO2 Ceramic Coating for Carbon Steel at High Temperature. Coatings. 2019; 9(3):167. https://doi.org/10.3390/coatings9030167
Chicago/Turabian StyleYu, Bo, Guoyan Fu, Yanbin Cui, Xiaomeng Zhang, Yubo Tu, Yingchao Du, Gaohong Zuo, Shufeng Ye, and Lianqi Wei. 2019. "Influence of Silicon-Modified Al Powders (SiO2@Al) on Anti-oxidation Performance of Al2O3-SiO2 Ceramic Coating for Carbon Steel at High Temperature" Coatings 9, no. 3: 167. https://doi.org/10.3390/coatings9030167