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Electrical Insulation and Conduction Coating for Fusion Experimental Devices

Masanori Onozuka, Seiji Tsujimura, Masahiko Toyoda, Masahiko Inoue, Tetsuya Abe, Yoshio Murakami

Fusion Science and Technology

Volume 29 / Number 1 / January 1996 / Pages 73-82


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The development of electrical insulation and conduction coating methods that can be applied to large components of fusion experimental devices has been investigated. A thermal spraying method is used to coat the insulation or conduction materials on the structural components because of its applicability for large surfaces. The insulation material chosen was Al2O3, while Cr3C2-NiCr and WC-NiCr were chosen as conduction materials. These materials were coated on stainless steel substrates to examine the basic characteristics of the coated layers, such as their adhesive strength to the substrate, thermal shock resistance, electrical resistance, dielectric breakdown voltage, and thermal conductivity. It was found that they have sufficient electrical insulation and conduction properties, respectively. In addition, the sliding tests of the coated layers showed adequate frictional properties. The spraying method was tested on a 100- × 1000-mm surface and found to be applicable for large surfaces of experimental fusion devices.

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