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Thermal Spray coating of tungsten for Tokamak Device

Plasma Science and Technology 2006年第2期8卷 164-167页

作者：蒋显亮 F. GITZHOFER M.I. BOULOS Institute of Surface and coatings Technology Central South University Changsha 410083 China Plasma Technology Research Center University of Sherbrooke Sherbrooke J1K 2R1Canada

Thermal spray, such as direct current （d.c.） plasma spray or radio frequency induced plasma spray, was used to deposit tungsten coatings on the copper electrodes of a tokamak device. The tungsten coating on the outer surface of one copper electrode was formed directly through d.c. plasma spraying of fine tungsten powder. The tungsten coating/lining on the inner surface of another copper electrode could be formed indirectly through induced plasma spraying of coarse tungsten powder. Scanning electron microscopy （SEM） was used to examine the cross section and the interface of the tungsten coating. Energy Dispersive Analysis of X-ray （EDAX） was used to analyze the metallic elements attached to a separated interface. The influence of the particle size of the tungsten powder on the density, cracking behavior and adhesion of the coating is discussed. It is found that the coarse tungsten powder with the particle size of 45-75μm can be melted and the coating can be formed only by using induced plasma. The coating deposited from the coarse powder has much higher cohesive strength, adhesive strength and crack resistance than the coating made from the fine powder with a particle size of 5μm.

关键词： tokamak device copper electrode thermal spray tungsten coating tungsten/copper interface

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Surface morphology and crystal orientation of electrodeposited tungsten coatings with different pulse parameters

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Rare Metals 2018年第5期37卷 407-412页

作者： Xian-Qin Fang Ying Zhang Kai-Gui Zhu Wen-Jia Han Jian-Gang Yu Zhe Chen Hui-Jun Shi Beijing Key Laboratory of Advanced Nuclear Energy Materials and Physics School of Physics and Nuclear Energy EngineeringBeihang University

This study was conducted to investigate the influence of pulse parameters on the surface morphology and crystal orientation of the tungsten coatings electrodeposited on pure copper substrates. The deposited coatings were analyzed by X-ray diffraction （XRD）, scanning electron microscopy （SEM） and energy-dispersive spectrometer （EDS）. SEM analysis indicates that pulse parameters have significant influences on the surface morphology of the deposited coatings. Meanwhile, the change in grain size of the tungsten coatings demonstrates that the change in frequency and duty cycle could cause the variation of nucleation rate and grain growth of deposits. Moreover, no obvious diffusion layer at the coating/substrate interface is found by line analysis of EDS. XRD results reveal that tungsten coatings are of bcc structure and the preferred orientation of the deposits varies with duty cycle and period.

关键词： tungsten coating Electrodeposition Pulse parameters Crystal orientation Surface morphology

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Thermal Performance Study of VPS-W coatings on CuCrZr Under High Heat Flux

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Plasma Science and Technology 2007年第3期9卷 261-264页

作者：种法力陈俊凌李建刚郑学斌丁传贤 Institute of Plasma Physics Chinese Academy of SciencesHefei 230031China Shanghai Institute of Ceramics Chinese Academy of SciencesShanghai 200050China

Three tungsten coatings with a thickness of 250 μm, 600μm and 220 μm, respectively, were deposited on a CuCrZr substrate by the vacuum plasma spraying technology. In order to study the thermal performance of the coatings, heat load limit, thermal fatigue lifetime and thermal response tests were performed by means of the electron beam irradiation with a heat flux from 0 MW/m^2 to 10 MW/m^2. Experimental results indicated that tungsten coatings on CuCrZr with a titanium or tungsten/copper interlayer could expel heat flux timely and had good thermal fatigue properties, titanium was a promising compliant layer which provided a reliable way to join tungsten onto the CuCrZr heat sink, even suffering from a heat flux of 10 MW/m^2 or withstanding 54 cycles of fatigue tests under 5 MW/m^2. However, the better quality of tungsten coating itself was necessary because its surface temperature was higher than that of the sample with a tungsten/copper interlayer.

关键词： heat flux vacuum plasma spray tungsten coating PFC

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Progress in Fusion Technologies and Materials Researches

Southwestern Institute of Physics Annual Report

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Southwestern Institute of Physics Annual Report 2006年第1期 145-147页

Fusion technologies and materials researches made progress in the major three aspects in 2006, specially implemented the ITER agreement tasks of first wall （FW） plate fabrication qualification and shield bulk thermal-hydraulic analysis and design, studied on low activation fusion structure materials and High Z plasma facing materials, experimentally investigated on liquid metal blanket magneto-hydrodynamics effects and so on.

关键词： Shield blanket Low activation materials tungsten coating Liquid metal

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