Structural reorientation and compaction of porous MoS2 coatings during wear testing

• Published in: Wear Vol. 500-501; p. 204339
• Main Authors: Krauß, Sebastian, Seynstahl, Armin, Tremmel, Stephan, Meyer, Bernd, Bitzek, Erik, Göken, Mathias, Yokosawa, Tadahiro, Zubiri, Benjamin Apeleo, Spiecker, Erdmann, Merle, Benoit
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 15.07.2022; Elsevier Science Ltd
• Subjects: Chemical vapor deposition; Coatings; Contact pressure; Crystal defects; Crystal growth; Crystallography; Molybdenum disulfide; MoS2; Nanoindentation; Physical vapor deposition; Single crystals; Texture; Transmission electron microscopy; Tribology; Wear rate; Wear testing; Transmission electron microscopy; Wear testing; MoS2; Nanoindentation; Tribology
• ISSN: 0043-1648; 1873-2577
• DOI: 10.1016/j.wear.2022.204339

Industrial upscaling frequently results in a different coating microstructure than the laboratory prototypes presented in the literature. Here, we investigate the wear behavior of physical vapor deposited (PVD) MoS2 coatings: A dense, nanocrystalline MoS2 coating, and a porous, prismatic-textured MoS2 coating. Transmission electron microscopy (TEM) investigations before and after wear testing evidence a crystallographic reorientation towards a basal texture in both samples. A basal texture is usually desirable due to its low-friction properties. This favorable reorientation is associated to a tribological compaction of the porous specimens. Following running-in, sliding under high contact pressure ultimately leads to a wear rate as small as for an ideal grown bulk MoS2 single crystal grown by chemical vapor deposition (CVD). This suggests that the imperfections of industrial grade MoS2 coatings can be remediated by a suitable pretreatment. •Evidence of tribological structural reorientation and compaction processes leading to improved wear behavior.•Highly resolved microstructure of deformed and undeformed sputter-deposited MoS2 coatings.•Identification of stress-dependent apparent wear rates from nanomechanical wear testing.