Study on the Pre-Oxidation and Resulting Oxidation Mechanism and Kinetics of Mo-9Si-8B Alloy
Abstract
:1. Introduction
2. Materials and Methods
3. Results and Discussion
3.1. Microstructures of the Plasma Oscillation Sintered Composites
3.2. Cross-Section of Pre-Oxidation Alloy
3.3. EDS Analysis and Surface Morphology of the Pre-Oxidized Alloy
3.4. Oxidation Behavior of Mo-Si-B Alloy at 1150 °C
3.5. Inferred Analysis and Mechanisms
4. Conclusions
- Pre-oxidation formed a borosilicate layer with a thickness of 3–5 μm. The selective oxidation of Si resulted in the formation of SiO2, and its lateral growth produced compressive stress, which led to a ‘hinge-locking’ mechanism and increased the adhesion to the substrate.
- In the pre-oxidation stage, part of B2O3 escaped directly from the substrate, and the other part entered the SiO2 layer. Its volume change promoted liquid flow and the movement of the bubbles from the bottom to top promoted the convection of SiO2 melt. Eventually, blasting caused SiO2 liquid to collapse and flow, which improved the fluidity of the protective layer.
- The reason for the failure of the ‘hinge-locking’ mechanism in the cyclic oxidation stage was that the MoO3 and MoO2 intermediate layer replaced the position of the Moss phase, and the thermal expansion coefficient of MoO3 and MoO2 intermediate layers decreased, which led to the decrease of the pressure on the SiO2 particles with the locking effect. In addition, the loose structure caused by MoO3 bubbles further released the pressure stress, resulting in the failure of the ‘link-locking’ mechanism.
- Pre-oxidation played a role in delaying the oxidation process in the initial stage of the cyclic oxidation, but as the cycle oxidation time increased, its protective effect was lost and entered the rapid weight loss stage, but the 10 h oxidation result still had certain advantages.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Species | |||||
---|---|---|---|---|---|
Si | 0 | 37.991 | 39.325 | 18.828 | 38.965 |
SiO2 | −847,260 | 94.535 | 98.027 | 46.861 | 97.084 |
B2O3 | −1,252,188 | 160.427 | 166.642 | 78.404 | 164.964 |
Mo | 0 | 50.011 | 51.467 | 28.606 | 51.074 |
O2 | 0 | 230.835 | 232.579 | 205.016 | 232.108 |
Mo3Si | −116,399 | 187.129 | 192.698 | 106.148 | 191.194 |
Mo5SiB2 | −309,616 | 369.280 | 380.389 | 207.342 | 377.389 |
MoO2 | −587,852 | 106.092 | 110.217 | 49.999 | 109.103 |
MoO3 | −360,661 | 338.169 | 342.156 | 279.910 | 341.079 |
Equations | ||||
−179,453.39 | −230,225.86 | −244,327.40 | −314,025.73 | |
(Pa) | 1.10 × 10−6 | 2.27 × 10−8 | 7.72 × 10−9 | 3.75 × 10−11 |
Equations | ||||
−350,203.87 | −355,661.54 | −458,738.29 | −438,933.16 | |
(Pa) | 2.36 × 10−12 | 1.55 × 10−12 | 5.77 × 10−16 | 2.67 × 10−15 |
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Wang, C.; Li, Q.; Guo, Z.; Li, X.; Ding, X.; Li, X.; Li, Z.; Li, B. Study on the Pre-Oxidation and Resulting Oxidation Mechanism and Kinetics of Mo-9Si-8B Alloy. Materials 2021, 14, 5309. https://doi.org/10.3390/ma14185309
Wang C, Li Q, Guo Z, Li X, Ding X, Li X, Li Z, Li B. Study on the Pre-Oxidation and Resulting Oxidation Mechanism and Kinetics of Mo-9Si-8B Alloy. Materials. 2021; 14(18):5309. https://doi.org/10.3390/ma14185309
Chicago/Turabian StyleWang, Cheng, Qiuliang Li, Zhenping Guo, Xiangrong Li, Xiangyu Ding, Xin Li, Zhuoyue Li, and Bin Li. 2021. "Study on the Pre-Oxidation and Resulting Oxidation Mechanism and Kinetics of Mo-9Si-8B Alloy" Materials 14, no. 18: 5309. https://doi.org/10.3390/ma14185309