| 摘要 |
PURPOSE:To prevent the frictional powder of expansive graphite and the like from sticking to an opposite shaft member in a packing made of ring-shaped expansive graphite by evaporating a low melting-point metal on the inner diameter surface. CONSTITUTION:A low melting point metal film 12 is evaporated on the inner diameter part of a packing directly in touch with an opposite shaft member. This method prevents frictional powder of expansive graphite and the like very effectively from sticking to the opposite member. When a contact part with the opposite member is heated, the low melting-point metal film 12 is melted to form a fluid film against the opposite member. Consequently, the coefficient of friction cannot be increased rapidly in the transition of time, and the packing made of expansive graphite is prevented from its fatal defect, seizure. Besides, since the low melting-point metal is provided between the expansive graphite and the opposite shaft member, the corrosion caused by potential difference can be effectively prevented even in case the opposite shaft member is of iron alloy or the like. |
