Iridium Coating Deposited by Double Glow Plasma Technique——Effect of Glow Plasma on Structure of Coating at Single Substrate Edge  

作　　者：吴王平 陈照峰 刘勇 

机构地区：[1]College of Material Science and Technology,Nanjing University of Aeronautics and Astronautics

出　　处：《Plasma Science and Technology》2012年第10期909-914,共6页等离子体科学和技术（英文版）

基　　金：supported by National Natural Science Foundation of China(50872055/E020703);Funding for Outstanding Doctoral Dissertation in NUAA(BCXJ11-09);the Fundamental Research Funds for the Central Universities;Funding of Jiangsu Innovation Program for Graduate Education of China(CXLX110207)

摘　　要：Double glow plasma technique has a high deposition rate for preparing iridium coating. However, the glow plasma can influence the structure of the coating at the single substrate edge. In this study, the iridium coating was prepared by double glow plasma on the surface of single niobium substrate. The microstructure of iridium coating at the substrate edge was observed by scanning electron microscopy. The composition of the coating was confirmed by energy dispersive spectroscopy and X-ray diffraction. There was a boundary between the coating and the substrate edge. The covered area for the iridium coating at the substrate edge became fewer and fewer from the inner area to the outer flange-area. The bamboo sprout-like particles on the surface of the substrate edge were composed of elemental niobium. The substrate edge was composed of the Nb coating and there was a transition zone between the Ir coating and the Nb coating. The interesting phenomenon of the substrate edge could be attributed to the effects of the bias voltages and the plasma cloud in the deposition chamber. The substrate edge effect could be mitigated or eliminated by adding lots of small niobium plates around the substrate in a deposition process.Double glow plasma technique has a high deposition rate for preparing iridium coating. However, the glow plasma can influence the structure of the coating at the single substrate edge. In this study, the iridium coating was prepared by double glow plasma on the surface of single niobium substrate. The microstructure of iridium coating at the substrate edge was observed by scanning electron microscopy. The composition of the coating was confirmed by energy dispersive spectroscopy and X-ray diffraction. There was a boundary between the coating and the substrate edge. The covered area for the iridium coating at the substrate edge became fewer and fewer from the inner area to the outer flange-area. The bamboo sprout-like particles on the surface of the substrate edge were composed of elemental niobium. The substrate edge was composed of the Nb coating and there was a transition zone between the Ir coating and the Nb coating. The interesting phenomenon of the substrate edge could be attributed to the effects of the bias voltages and the plasma cloud in the deposition chamber. The substrate edge effect could be mitigated or eliminated by adding lots of small niobium plates around the substrate in a deposition process.

关 键 词：glow plasma COATING IRIDIUM NIOBIUM 

分 类 号：O539[理学—等离子体物理]