Erosion and Modifications of Tungsten-Coated Carbon and Copper Under High Heat Flux

Erosion and Modifications of Tungsten-Coated Carbon and Copper Under High Heat Flux

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摘要 Tungsten-coated carbon and copper was prepared by vacuum plasma spraying (VPS) and inert gas plasma spraying (IPS), respectively. W/CFC (Tungsten /Carbon Fiber-Enhanced material) coating has a diffusion barrier that consists of W and Re multi-layers pre-deposited by physical vapor deposition on carbon fiber-enhanced materials, while W/Cu coating has a graded transition interface. Different grain growth processes of tungsten coatings under stable and transient heat loads were observed, their experimental results indicated that the recrystallizing temperature of VPS-W coating was about 1400 ℃ and a recrystallized columnar layer of about 30 μm thickness was formed by cyclic heat loads of 4 ms pulse duration. Erosion and modifications of W/CFC and W/Cu coatings under high heat load, such as microstructure changes of interface, surface plastic deformations and cracks, were investigated, and the erosion mechanism (erosion products) of these two kinds of tungsten coatings under high heat flux was also studied. Tungsten-coated carbon and copper was prepared by vacuum plasma spraying (VPS) and inert gas plasma spraying (IPS), respectively. W/CFC (Tungsten /Carbon Fiber-Enhanced material) coating has a diffusion barrier that consists of W and Re multi-layers pre-deposited by physical vapor deposition on carbon fiber-enhanced materials, while W/Cu coating has a graded transition interface. Different grain growth processes of tungsten coatings under stable and transient heat loads were observed, their experimental results indicated that the recrystallizing temperature of VPS-W coating was about 1400 ℃ and a recrystallized columnar layer of about 30 μm thickness was formed by cyclic heat loads of 4 ms pulse duration. Erosion and modifications of W/CFC and W/Cu coatings under high heat load, such as microstructure changes of interface, surface plastic deformations and cracks, were investigated, and the erosion mechanism (erosion products) of these two kinds of tungsten coatings under high heat flux was also studied.

作者刘翔 S.Tamura K.Tokunaga N.Yoshida 张斧许增裕葛昌纯 N.Noda

机构地区 Southwestern Institute of Physics Research Institute for Applied Mechanics Laboratory of Special Ceramics and Powder Metallurgy National Institute for Fusion Science

出处《Plasma Science and Technology》 SCIE EI CAS CSCD 2003年第4期1887-1894,共8页 等离子体科学和技术（英文版）

基金 Part of the work was supported by Core University Program of Ministry of Education,Culture and Science,Japan

关键词 plasma spraying tungsten coatings RECRYSTALLIZATION plastic deformation erosion products plasma spraying, tungsten coatings, recrystallization, plastic deformation, erosion products

分类号 O539 [理学—等离子体物理]

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Erosion and Modifications of Tungsten-Coated Carbon and Copper Under High Heat Flux

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