阴极
材料科学
阴极电弧沉积
激光烧蚀
复合材料
图层(电子)
烧蚀
弧(几何)
包层(金属加工)
激光器
电弧
冶金
电极
光学
电化学
化学
阴极保护
物理
几何学
数学
物理化学
工程类
航空航天工程
作者
Weimian Guan,Mingyu Gao,Zhihui Li,Jiabin Liu,Jie Yuan,Yongsheng Long,Hongtao Wang
标识
DOI:10.1002/adem.202300052
摘要
Arc ablation threatens the cathode operating time and restricts the development of high‐power arc heaters. Surface modification is an effective strategy in improving cathode ablation resistance without reducing matrix conductivities. Herein, Nb layer and Ti layer are laser clad on Cu matrix to decrease the arc ablation of Cu cathode. The total thickness of laser‐clad Nb/Ti layer reaches 1850 μm. The Nb layer restrains Cu from diluting into surface cladding and no detrimental Ti–Cu intermetallic is formed. The surface Ti content is as high as 98.34 at%, guaranteeing the arc discharge homogeneity. The arc ablation behaviors of Ti/Nb/Cu cathodes are investigated in air atmosphere. The layered cathode discharges and ablates homogeneously. The arc discharge center is shallow with no appearance of deep pits or craters. The maximum ablation depth (72.1 μm) after 30 s discharging is ≈33.4% lower than that of Cu cathode. Besides, the cathode ablation rate, 1.61 μg C −1 , is ≈27.5% lower than Cu cathode. The improved arc ablation resistance is interpreted in the protective effect of refractory TiO 2 layer formed during air arc discharging.
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