| Nb-Si基合金表面Mo-Si-B涂层制备及抗氧化性能 |
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| 引用本文： | 庞洁,周春根.Nb-Si基合金表面Mo-Si-B涂层制备及抗氧化性能[J].材料工程,2018(2):73-77. |
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| 作者姓名： | 庞洁 周春根 |
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| 作者单位： | 中国航发北京航空材料研究院航空材料先进腐蚀与防护航空科技重点实验室,北京,100095
北京航空航天大学材料科学与工程学院,北京,100191 |
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| 基金项目： | 国家自然科学基金资助项目 |
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| 摘 要： | 为提高Nb-Si合金的抗高温氧化性能,在其表面制备Mo-Si-B涂层。通过Thermo-Calc计算的方法,从热力学角度分析NaF和AlF_3两种激活剂对Si-B二元共渗的影响。结果表明:以NaF为激活剂时可以实现Si-B的二元共渗,而以AlF3为激活剂时,难以实现Si-B的二元共渗。通过爆炸喷涂结合包埋渗的方法在Nb-Si合金表面成功制备Mo-Si-B涂层,涂层主要由有弥散硼化物分布的MoSi2外层和未反应的Mo内层构成。涂层在1250℃氧化100h后涂层的氧化增重仅为1.52mg/cm~2,良好的抗高温氧化性能是由于涂层在高温氧化过程中形成了一层具有保护性的硼硅酸盐层。
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| 关 键 词： | Nb-Si合金 Mo-Si-B涂层 激活剂 包埋渗 氧化 Nb-Si alloy Mo-Si-B coating activator pack cementation oxidation |
Preparation and Oxidation Resistance of Mo-Si-B Coating on Nb-Si Based Alloy Surface |
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| PANG Jie,ZHOU Chun-gen.Preparation and Oxidation Resistance of Mo-Si-B Coating on Nb-Si Based Alloy Surface[J].Journal of Materials Engineering,2018(2):73-77. |
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| Authors: | PANG Jie ZHOU Chun-gen |
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| Abstract: | Mo-Si-B coating was prepared on Nb-Si alloys to improve the high-temperature oxidation . The influence of the halide activators (NaF and AlF3 ) on Si-B co-depositing to obtain Mo-Si-B coating on Nb-Si alloys was analyzed by thermochemical calculations .The results show that NaF proves to be more suitable than AlF3 to co-deposit Si and B .Then Mo-Si-B can be coated on Nb-Si based alloys u-sing detonation gun spraying of Mo followed by Si and B co-deposition .The fabricated coatings consist of outer MoSi2 layer with fine boride phase and inner unreacted Mo layer .The mass gain of the Mo-Si-B coating is 1 .52mg/cm2 after oxidation at 1250℃ for 100h .The good oxidation resistance results in a protective borosilicate scale formed on the coating. |
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