General regularities of wear in vacuum for solid film lubricants formulated with lamellar materials

• Published in: Wear Vol. 93; no. 3; pp. 319 - 332
• Main Authors: Gamulya, G.D., Dobrovol'skaya, G.V., Lebedeva, I.L., Yukhno, T.P.
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 01.02.1984; Amsterdam Elsevier Science; New York, NY
• Subjects: abrasion; additives; Applied sciences; Condensed matter: structure, mechanical and thermal properties; Contact of materials. Friction. Wear; Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; Friction, wear, lubrication; lubricants; Machine components; Materials science; Mechanical and acoustical properties of condensed matter; Mechanical engineering. Machine design; Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology; Metals, semimetals and alloys; Metals. Metallurgy; Physics; sliding; Specific materials; surface properties; wear; Solid lubricant; Scanning electron microscopy; Tungsten sulfide; Tungsten compound; Wear test; Fretting fatigue; Molybdenum sulfide; Wear mechanisms; Electron microscopy; Texture; Diagram; Textures; Optical microscopy; Lamellar structure; Vacuum; Abrasive wear; Mechanical stress; Wear; Graphite; Carbamide resin; Under vacuum; Transmission electron microscopy; Lubrication; Experimental study; Lubricant
• ISSN: 0043-1648; 1873-2577
• DOI: 10.1016/0043-1648(84)90205-9

Details of changes in surface morphology were observed in bonded solid film lubricants with MoS 2 and graphite lubricant additives that slid against metal counterfaces in vacuum. The active layer structure formed during sliding was studied by means of optical, scanning electron and transmission electron microscopy. The character of film surface detrition was found to be similar for solid film lubricants containing various lamellar additives and to be affected by the reorientation of the lamellar material within the binder. During runningin the abrasive mechanism of wear is predominant in a sliding pair. The onset of the equilibrium stage is recognized the formation of the axial-type texture ( i.e. when the easy slip (0001) planes of a lubricant fraction are parallel to the sliding surface) in the upper layer of the lubricant film. At the equilibrium stage solid film lubricants are worn out by a fatigue mechanism due to the accumulation of stresses that build up as a result of both the turning of lubricant additive particles within the binder and texturing inside the particles themselves. In this stage solid film lubricants are damaged by delamination accompanied by blistering with subsequent breakdown of the blisters on repeated sliding runs.