Microstructure analysis of MoS2 deposited on diamond-like carbon films for wear improvement
1999; Elsevier BV; Volume: 111; Issue: 2-3 Linguagem: Inglês
10.1016/s0257-8972(98)00712-9
ISSN1879-3347
AutoresDa-Yung Wang, Chi-Lung Chang, Wei-Yu Ho,
Tópico(s)Lubricants and Their Additives
ResumoA compound solid lubricating film containing a MoS2 top layer deposited on DLC interlayer by UBM sputtering technique was investigated for its tribological applications in humid environments. TEM, Raman and XRD analysis revealed the amorphous nature of the MoS2 film which contains only short-range order in its lattice structure. The as-deposited MoS2 compound films showed well-bonded interfaces. The MoS2, however, is very susceptible to humidity and oxidation, which resulted in higher friction coefficients and lower wear life. A friction coefficient of 0.05 was measured between steel balls and MoS2 in atmosphere of 90% RH. Excessive abrasive wear was identified, as a result of the wear debris and the oxidized transfer layers between MoS2 and its counterpart. The inclusion of a supportive DLC interlayer has effectively improved the wear behavior of MoS2 films under various loading conditions. The overall wear mechanism of MoS2 was complicated due to its oxidation problem which needs to be resolved for successful usage of MoS2 in humid environments.
Referência(s)