Nb-Si基合金表面Mo-Si-B涂层制备及抗氧化性能  

Preparation and Oxidation Resistance of Mo-Si-B Coating on Nb-Si Based Alloy Surface

作　　者：庞洁 周春根[2] PANG Jie;ZHOU Chun-gen(viation Key Laboratory of Science and Technology on Advanced Corrosion and Protection for Aviation Materials,AECC Beijing Institute of Aeronautical Materials,Beijing 100095,China;School of Materials Science and Engineering,Beihang University,Beijing 100191,China)

机构地区：[1]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 [2]北京航空航天大学材料科学与工程学院,北京100191

出　　处：《材料工程》2018年第2期73-77,共5页Journal of Materials Engineering

基　　金：国家自然科学基金资助项目(U1435201)

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。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 M〇-Si-B coating on Nb-Si alloys was analyzed by thermochemical calculations.The results show that NaF proves to be more suitable than A1F3 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/cmz after oxidation at 1250°C for lOOh.The good oxidation resistance results in a protective borosilicate scale formed on the coating.

关 键 词：Nb-Si合金 Mo-Si-B涂层 激活剂 包埋渗 氧化 

分 类 号：TG174.4[金属学及工艺—金属表面处理]