Accession Number : ADA300981

Title :   Fracture in MoS2 Solid Lubricant Films.

Descriptive Note : Technical rept.,

Corporate Author : AEROSPACE CORP EL SEGUNDO CA EL SEGUNDO TECHNICAL OPERATIONS

Personal Author(s) : Hilton, Michael R.

PDF Url : ADA300981

Report Date : 01 SEP 1995

Pagination or Media Count : 13

Abstract : The fracture properties of sputter-deposited films of MoS2 as a function of additive-controlled microstructure were assessed using brale indentation contact and scanning electron microscopy (SEM). Additives were incorporated as either co-sputtered species (Ni, SbOx) or as multilayers (Au-20%Pd, Ni). Undoped films were also examined as references. The undoped films and 3% co-sputtered Ni films (deposited at 0.266 Pa argon background pressure) showed zone 2 columnar plate morphologies with porosity. Co-sputtered films having higher concentrations of Ni or SbOx showed zone 1 dense cauliflower morphologies, while the multilayer films (and pure MoS2 films deposited at 0.266 Pa) exhibited dense, featureless morphologies. The porous zone 2 films generally resisted delamination better than the denser morphologies. High Ni concentrations increased spallation. The presence of SbOx affected fracture propagation and appeared to be more benign than Ni. The presence of multilayers also affected fracture and retarded spallation in dense microstructures. However many multilayer structures showed significant delamination.

Descriptors :   *FILMS, *SOLIDS, *FRACTURE(MECHANICS), *MOLYBDENUM COMPOUNDS, *SULFIDES, *LUBRICATING FILMS, PROPAGATION, SCANNING ELECTRON MICROSCOPES, MICROSTRUCTURE, LAYERS, STRUCTURES, POROSITY, ELECTRON MICROSCOPY, DEPOSITION, OXIDES, HIGH DENSITY, PRESSURE, ADDITIVES, NICKEL, ARGON, ANTIMONY, SPUTTERING, CONCENTRATION(CHEMISTRY), RETARDATION, SPALLATION.

Subject Categories : Inorganic Chemistry
      Physical Chemistry
      Coatings, Colorants and Finishes
      Lubricants and Hydraulic Fluids
      Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE