Accession Number : ADA255793


Title :   Structural and Tribiological Studies of MoS2 Solid Lubricant Films Having Tailored Metal-Multilayer Nanostructures


Descriptive Note : Technical rept.


Corporate Author : AEROSPACE CORP EL SEGUNDO CA TECHNOLOGY OPERATIONS


Personal Author(s) : Hilton, M R ; Bauer, R ; Didziulis, S V ; Dugger, M T ; Keem, J M ; Scholhamer, J


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a255793.pdf


Report Date : 15 Dec 1991


Pagination or Media Count : 35


Abstract : Molybdenum disulfide (MoS2) solid lubricant films were prepared by rf magnetron sputtering on 440C steel, 52100 steel, and Si substrates. This study concentrated on films that were multilayer coatings of MoS2 with either Ni or Au-Pd(20%) metal interlayers. Multilayer thickness ranged from 0.2 run to 1.0 run while the multilayer periodic spacing ranged from 3 to 10 run. Scanning electron microscopy and X-ray diffraction revealed that the multilayer films had dense microstructures that, in some cases, exhibited significant orientation of their basal planes parallel to the substrate. Film endurance was assessed in sliding contact by using thrust washer tests and in rolling contact by using thrust bearing tests. Some film microstructures exhibited excellent endurance. Brale indentation indicated that the metal layers can improve film fracture toughness. Friction in air and ultra-high vacuum (UHV) was investigated using a UHV-compatible test apparatus. Friction coefficients between 0.05 and 0.08 were measured in UHV.


Descriptors :   *METALS , *FILMS , *MOLYBDENUM , *NANOSTRUCTURES , *SOLID LUBRICANTS , TEST AND EVALUATION , THICKNESS , MICROSTRUCTURE , TOUGHNESS , SOLIDS , FRACTURE(MECHANICS) , THRUST , SPUTTERING , FRICTION , GOLD , BEARINGS , NICKEL , SILICON , COEFFICIENTS , COATINGS , SCANNING ELECTRON MICROSCOPY , HIGH VACUUM , MAGNETRONS , THRUST BEARINGS , SLIDING CONTACTS , TRIBOLOGY , SULFIDES , LUBRICANTS , STEEL , SUBSTRATES , AIR , LAYERS , STRUCTURES , X RAY DIFFRACTION , VACUUM


Subject Categories : Physical Chemistry
      Properties of Metals and Alloys
      Lubricants and Hydraulic Fluids
      Mechanics


Distribution Statement : APPROVED FOR PUBLIC RELEASE