TAILIEUCHUNG - Handbook of Lubrication part 8

Tham khảo tài liệu 'handbook of lubrication part 8', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Volume II 277 of the film is Even in very carefully controlled conditions repeat determinations of wear life can show considerable scatter. With the Timken apparatus Figure 1e scatter in wear life determinations can exceed 100 . With Falex tests Figure 1e scatter is usually less than 50 . Falex tests are commonly incorporated into specification requirements for thin film lubricants. The four-ball machine Figure la is widely used for evaluating solid lubricant additives in oils the pin disc and pin ring arrangements Figures 1b to d are used for wear testing self-lubricating composites as well as thin film lubricants reciprocating line-contact arrangements Figure 1d show promise for wear testing thin self-lubricating bearing-liner ma-terials 32 the press-fit test Figure 1h is used for dry powders and rubbed films and the journal and thrust-bearing configurations Figures 1f and g simulate bearing applications for both thin films and self-lubricating composites. OPERATIONAL PERFORMANCE Thin Film Lubricants Rubbed Films The simplest way to coat a solid lubricant on a metal surface is by burnishing of dry powder MoS2 graphite etc. with a soft tissue. MoS2 films produced in this way range from to 10 pm thick depending on rubbing time. Film thickness also increases with increasing Bonding of lamellar solids to the substrate appears to involve three mechanisms 1 particles can be physically trapped within surface depresssions 2 crystallites may be mechanically embedded into the substrate and act as nuclei around which film growth occurs via intercrystallite cohesion and 3 the lubricant may interact chemically with the substrate. The importance of the last component is supported by observations that effectiveness of MoS2 film formation on different metals correlates with the strength of the metal-sulfur Behavior of rubbed MoS2 films shows some general trends with operational parameters. Friction rises with increasing relative humidity 35 .

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