Surface roughness for mechanical seal applications-

Surface roughness for mechanical seal applications

　2017-03-21　　

Surface roughness for mechanical seal applications

The current experimental research shows that in the case of plastic contact, since the surface roughness has little effect on the actual contact area, it has little effect on the friction coefficient. But for the dry friction of elastic or elastoplastic contact, the smoother the surface, the larger the actual area, and because the surface molecular attractive force effectively acts, the friction coefficient increases.

For mixed friction, the smoother the surface, the larger the area covered by the lubricant, and the smaller the friction coefficient.

The dynamic friction coefficient and the static friction coefficient change with the surface roughness are different: the static friction coefficient decreases with the increase of the surface roughness; the dynamic friction coefficient passes through a minimum value as the surface roughness becomes smaller, and the sliding speed increases Larger, the closer the minimum value is to the starting point of the ordinate. It can be considered that surface roughness contributes to mechanical deformation and increases the coefficient of friction. In addition, the surface is smooth, which acts on molecular attraction and increases the coefficient of friction, so there is a surface roughness with the smallest coefficient of friction. For example, for mechanical seals, the appropriate surface roughness of the friction pair is 0.04-0.16um.　　371.html,

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