Yoshiyasu Itoh1, Hideyasu Andoh2, Shoko Suyama2 and Takahiko Shindoh2
1Power and Industrial System R & D Center, Toshiba Corporation, Yokohama 230-0045
Tungsten/copper coatings were developed by using plasma spraying for electric arc resistant coatings. However, the thermal and electrical properties of thermal sprayed coatings were not clarified. Two kinds of free-standing tungsten/copper coatings, which were sprayed by an atmospheric plasma spraying (APS) and a low pressure plasma spraying (LPPS), were machined from the thick coatings. The thermal conductivity, electric resistivity and specific heat were measured at room temperature. The experimental results suggested that the volume fraction of tungsten or copper, porosity and oxide content had important effects on the thermal and electrical properties. Namely, the high thermal conductivity and the low electric resistivity could be obtained from the tungsten/copper coatings sprayed by LPPS process, because of the low porosity and the low oxide content.
(Received August 7, 2001)
tungsten/copper composites, electric arc resistant coating, atmospheric plasma spraying, low pressure plasma spraying, electric resistivity, specific heat, thermal conductivity
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