Structural reorientation and compaction of porous MoS2 coatings during wear testing

TL;DR

This study examines how industrial MoS2 coatings undergo structural reorientation and densification during wear, leading to improved tribological performance comparable to high-quality single crystals.

Contribution

It reveals that wear induces a basal texture in industrial MoS2 coatings, enhancing their low-friction properties through tribological compaction.

Findings

Crystallographic reorientation towards basal texture during wear.

Porous coatings become denser and more aligned after testing.

Wear rates approach those of high-quality bulk MoS2.

Abstract

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.