摘要
为了延长纯钛在高温环境下的工作寿命,采用电弧喷涂方法在纯钛表面制备了NiAl/Al复合涂层.在热处理炉中进行800℃×50 h连续氧化实验,根据NiAl层与纯Al层反应生成的金属间化合物性能,考察涂层的高温抗氧化行为和高温防护机制.结果表明,复合涂层在体系中具有足够的Al、Ni元素,可在涂层外表面形成以Al2O3为主的氧化物防护层,从而阻碍氧向内侵入.在高温氧化过程中NiAl/Al涂层中的Al发生熔化扩散,并与Ni和Ti形成以NiAl、Ni2Al3、NiAl3及TiAl3富Al相为主的扩散阻挡层.NiAl/Al复合涂层显著提高了纯钛的高温抗氧化能力.
In order to prolong the working life of pure titanium in high temperature environment,a NiAl/Al composite coating was prepared on the surface of pure titanium by an arc spraying method.A continuous oxidation experiment was carried out at 800℃for 50 h in a heat treatment furnace.According to the performance of intermetallics formed by the reaction between NiAl and pure Al layers,the high temperature oxidation resistance and high temperature protection mechanism of as-proposed coating were investigated.The results show that the composite coating has sufficient Al and Ni elements in the system,and they can form an oxide protective layer mainly composed of Al2O3 on the outer surface of as-proposed coating,prohibiting the inward invasion of oxygen.In the high temperature oxidation process,Al constituent in the NiAl/Al coating melts and diffuses,and forms diffusion barriers mainly composed of Al-rich phases(e.g.NiAl,Ni2Al3,NiAl3 and TiAl3)containing Ni and Ti elements.The NiAl/Al composite coating significantly improves the high temperature oxidation resistance of pure titanium.
作者
李德元
李斌
LI De-yuan;LI Bin(School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, China)
出处
《沈阳工业大学学报》
EI
CAS
北大核心
2020年第3期270-275,共6页
Journal of Shenyang University of Technology
基金
辽宁省自然科学基金项目(201602553).
关键词
电弧喷涂
扩散阻挡层
NiAl/Al涂层
高温抗氧化
纯钛表面
富Al相
氧化实验
防护机制
arc spraying
diffusion barrier
NiAl/Al coating
high temperature oxidation resistance
pure titanium surface
Al-rich phase
oxidation experiment
protection mechanism
