立軸ポンプ用セラミックス軸受に関する研究 : 第2報,空気中および水中での摩擦係数について

概要

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Friction coefficients of various sleeve-type submersible bearings for vertical pumps in air and water were investigated. The tested materials were SiC-sintered ceramics, WC-cemented carbides, self-fluxing alloys, and conventional bearing materials such as rubber, resin, PTFE # and soft sintered alloy. Test equipment simulated the frictional condition of the actual vertical pump shaft, that is, the shaft of the test equipment precessed to the bearing. It was clear that, in water, when silicon carbide was used as a stationary bearing, lower friction coefficients than conventional bearings could be obtained, regardless of rotating sleeve materials. In slurry, the abrasive grains had a bad influence on the friction coefficient of the conventional bearings. But, bearings of ceramics could keep low friction coefficients owing to their hardness. In air, a combination of silicon carbide and tungsten carbide showed low friction coefficient. And it is confirmed that dry start of vertical pumps can be attained with this material combination.
1989-01-25