BONDING OF MOLYBDENUM DISULFIDE TO VARIOUS MATERIALS TO FORM A SOLID LUBRICATING FILM II- FRICTION AND ENDURANCE CHARACTERISTICS OF FILMS BONDED BY PRACTICAL METHODS

摘要

The use of molybdenum disulfide MoS2 as a solid-film lubricant is being extended, particularly in applications where designs or higher temperatures preclude liquid lubricants, because of the good frictional and thermal characteristics of MoS2， An investigation was conducted to determine (l) practical methods of bonding M0S2 to materials to form solid-film lubricants and (2) friction and endurance characteristics of films so formed. The results indicated that satisfactory solid-film lubricants can be formed on a variety of materials by brushing on M0S2 mixed with a resin-forming vehicle (l part MoS2, 2 parts vehicle, by weight) such as:thinned asphalt-base varnish, silicone-base varnish, or glycerol. The brushing is followed by air drying, infrared drying, and oven curing. The choice of the resin-forming liquid vehicle is governed by the types of application. In the use of asphalt-base varnish, the cleaning of the specimens was not critical because of mutual solubility of the varnish, thinner, and the usual surface contaminating greases. Scraping and rubbing tests showed that all the solid-film lubricants bonded equally well to as-cast, as-rolled, ground, and turned surfaces, indicating that surface finish did not influence tenacity and toughness of the film. Friction and endurance data obtained under severe conditions of high sliding velocities and high surface stress showed that solid-film lubricants (between 0.0002 and 0.0005 in. thick) of MoS2, bonded with the various resins as well as corn-eyrup resin, resulted in good-lubricating effectiveness.