摘要
为了提高纯钛的高温抗氧化性能,采用电弧喷涂和等离子喷涂方法在纯钛表面制备Ni/Al复合涂层.利用激光重熔使得Ni层与Al层发生冶金反应,对试件进行800℃×40 h连续氧化.根据生成的金属间化合物特征研究纯钛的高温抗氧化行为.结果表明,经过表面改性处理后Ni/Al复合涂层可以显著提高纯钛的高温抗氧化性能.在激光重熔过程中Ni/Al复合涂层中的Al发生熔化扩散并与Ni形成以Ni2Al3相为主的扩散层.在氧化过程中Ni/Al复合涂层表面形成连续且致密的α-Al2O3氧化膜与大量NiAl相,表面扩散层中的富铝相可为表面提供充足的Al元素,进而对纯钛基体提供有效的高温抗氧化保护作用.
In order to improve the high temperature oxidation resistance of pure titanium,a Ni/Al composite coating was prepared on the surface of pure titanium with an arc and plasma spraying method. Laser remelting was employed to accomplish the metallurgical reaction of Ni and Al layers,and the specimens were continuously oxidized at 800℃ for 40 h. The high temperature oxidation resistance of pure titanium was studied according to the features of intermetallic compounds. The results show that the Ni/Al composite coating after the surface modification can significantly improve the high temperature oxidation resistance of pure titanium. During the laser remelting process,Al element in the Ni/Al composite coating melts and diffuses to form a diffusion layer with Ni,which is mainly composed of Ni2Al3 phase. During the oxidation process,on the surface of Ni/Al composite coating,a continuous and dense α-Al2O3 oxidation film forms,and a large amount of NiAl phase precipitates. Furthermore,the aluminum-rich phases in surface diffusion layer can supply sufficient Al element,effectively providing high temperature antioxidation protection for pure titanium substrate.
作者
李德元
王进
LI De-yuan;WANG Jin(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2期164-168,共5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
等离子喷涂
激光重熔
Ni/Al涂层
高温抗氧化性能
氧化增重
纯钛
表面改性
arc spraying
plasma spraying
laser remelting
Ni/Al coating
high temperature oxidation resistance
oxidation weight gain
pure titanium
surface modification
