四ふっ化エチレン樹脂の摩擦摩耗に関する研究 : (焼結金属への含浸材について)

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タイトル別名
  • Friction and Wear Properties of P. T. F. E.-Impregnated Material
  • シフッカ エチレン ジュシ ノ マサツ マモウ ニ カンスル ケンキュウ

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抄録

It is known that, although the wear of Polytetrafluoroethylene (P. T. F. E.) is not good, the material which is made of a porous metal impregnated with P. T. F. E. has good wear properties without any lubrication. In this paper the friction and wear behavior of the material is cleared using the method of measuring the electric contact resistance. Film of P. T. F. E. deposited on the surface of a metal does not show breakdown of resistance so far as the specimen is loaded statically up to 135 kg. It wore out, however, in a short time at the beginning of sliding even if the load and velocity are low. As a result, metallic contact takes place simultaneously throughout the experiment of the resistance. The phenomena can not be explained only by the suggested conceptions of "difference in expansion of P. T. F. E." by Mitchell and Burke(10) and of "continue to feed the plastic as an action of bearing metal alloy" by Bowden and Tabor(18e). It is concluded that the actual mechanism of anti-wear properties of the material depends both on the oxide film of bronze and the anti-wear properties of P. T. F. E. produced at a high temperature (200°C∼300°C) without impregnation as already reported by the author, and that, if either one of the two is lacking, it would easily fail. In this paper the temperature (T-T0) of frictional heating is also described as follows : T-T0=PV0.85 (P : kg/cm2, V : cm/s) This formula can be effectively used in a wide range of load and velocity.

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