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 using plasma spraying techniques for electric arc resistant. However, the mechanical properties of plasma sprayed coatings, which had an important effect on the adherent strength etc., were not clarified. Two kinds of free-standing tungsten/copper coatings, which were produced by an atmospheric plasma spraying (APS) and a low pressure plasma spraying (LPPS), were machined from the thick coatings and were used for experiments. The Young's modulus, Poisson's ratio and four-point bending strength were measured at room temperature. The experimental results suggested that the volume fraction of tungsten or copper, porosity and oxide content had an important effect on the mechanical properties. Namely, the high Young's modulus, high Poisson's ratio and high bending strength could be obtained from the tungsten/copper coatings produced by LPPS process, because of the low porosity and low oxide content.
(Received June 22, 2001)
tungsten/copper coatings, electric arc resistant coating, atmospheric plasma spraying, low pressure plasma spraying, Young's modulus, Poisson's ratio, four-point bending strength
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