Investigation of Third Body Processes by In Vivo Raman Tribometry (Preprint)

A Raman tribometer has been used to study third body processes and friction during sliding against two low friction coatings: annealed boron carbide and Mo-S-Pb, a MoS2-based coating. Reciprocating sliding tests were performed in either dry or humid air with transparent hemispheres (glass or sapphir...

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Bibliographic Details
Main Authors: Singer, Irwin L, Dvorak, S D, Wahl, Kathryn J
Format: Report
Language:English
Subjects:
BORON CARBIDES
BORON OXIDES
CARBON
FRICTION TESTS
LEAD COMPOUNDS
Mechanics
MOLYBDENUM COMPOUNDS
Physical Chemistry
RAMAN TRIBOMETRY
SLIDING FRICTION
SULFUR COMPOUNDS
SURFACE CHEMISTRY
SYMPOSIA
THIN FILMS
THIRD BODY PROCESSES
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Summary:A Raman tribometer has been used to study third body processes and friction during sliding against two low friction coatings: annealed boron carbide and Mo-S-Pb, a MoS2-based coating. Reciprocating sliding tests were performed in either dry or humid air with transparent hemispheres (glass or sapphire) loaded against the coatings. Videos and Raman spectra of the sliding contact were recorded during the tests. For annealed boron carbide, friction was controlled by a mix of H3BO3 and carbon; for amorphous Mo-S-Pb, friction was controlled by MoS2 generated by sliding. Friction changes in the former were correlated to the relative amount of the two materials; in the latter, the rise in friction was ascribed to a change in interfacial shear strength of MoS2, inferred from the deformation of transferred debris particles. For both coatings, interfacial sliding was the dominant mode of velocity accommodation in the sliding interface. Prepared in collaboration with the Department of Mechanical Engineering Technology University of Maine, Orono, ME Presented at the Nordic Symposium on Triology (9th), NORDTRIB2000, held in Porvo, Finland on 11-14 Jun 2000 and published in proceedings of the same, p31-41. The original document contains color images.