Dry Film Lubricants, also know as solid film lubricants, provide a lubricating film that reduces friction, inhibits galling and seizing and in some instances can aid in dispersing heat. The appearance is generally a charcoal gray and takes on a sheen upon burnishing. They are very slippery and provide an extremelylow coefficient of friction.
The ingredients in these coatings consist of pigments, solvents and binders. The binders provide the anchor that secure the solids to the material beimg coated and the solvents thin the coating for ease of spraying and to aid in achieving the proper film thickness. The pigments consists of the lubricants and other ingredients that provide additional desired characteristics such as improved flow and leveling.
The two most important components are the binders and lubricating ingredients. Without a good binder the coating will not stay in place and will simply cold flow or buff out in operation. Similar coatings using the same pigments but different binding systems can show different load carrying abilities, ranging from 100,000 psi to as much as 350,000 psi or in some instances even more. The pigments determine the actual lubricating potential. PTFE as an example is listed as having the lowest coefficient of friction (COE). However, under high speed and high laod the COE of PTFE degrades, while that of MOS2 (Moly) improves until it is better than PTFE. Slecting the proper ingredients can make or break a coating.
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