Research on the damage mechanism of low current 50 keV electron beam on the micro structure, composition and vacuum tribological performance of MoS2-Ti films deposited by unbalanced magnetron sputtering

Preparation and Characterization of the Polyimide-MoS2/PTFE Composite with High Strength and Self-Adaptive Lubricating Performance in Air and Vacuum

“…For C 1s, the peaks at 284.7, 285.55, and 288.38 eV are attributed to C1#, C2#–5#, and C6# (the numbers refer to different chemical states as same as the indication in Figure S1), while the peak at 292.35 eV belongs to the carbon in PTFE. , Besides a little contamination from air, the signals of O 1s and N 1s (the small peak at 395.07 eV is donated by Mo 3p 3/2 ) are from the PI matrix Figure d mainly shows the double splitting peaks of Mo 3d 5/2 at 229.07 eV and Mo 3d 3/2 at 232.20 eV, which suggests that MoS 2 is the primary chemical state of the element Mo. , Figure e displays four separated peaks, which are S 2p 3/2 at 161.95 eV and S 2p 1/2 163.13 eV belonging to MoS 2 * as well as S 2p 3/2 at 168.36 eV and S 2p 1/2 at 169.54 attributed to high=valence sulfur (−S*O 4 2– , sulfonate) . The two peaks in Figure f belong to PTFE at 689.23 eV and its degradation products at 684.60 eV. , The contents of the different chemical state are in direct proportion to the integral area of the corresponding peak; therefore, it can be speculated that only a little MoS 2 and PTFE are oxidized and degraded due to machining and storage processes.…”

“…47 Figure 6d mainly shows the double splitting peaks of Mo 3d 5/2 at 229.07 eV and Mo 3d 3/2 at 232.20 eV, which suggests that MoS 2 is the primary chemical state of the element Mo. 49,50 , sulfonate). 48 The two peaks in Figure 6f belong to PTFE at 689.23 eV and its degradation products at 684.60 eV.…”

High Wear Resistance of POSS Grafted-Polyimide/Silica Composites under Atomic Oxygen Conditions

“…Lubrication failure of moving parts in spacecraft induced by vacuum, atomic oxygen irradiation and high/low temperature, etc., is an issue needing urgent attention in space environment [ 1 , 2 , 3 , 4 , 5 , 6 ]. When most materials are exposed to vacuum environment, mass loss and performance degradation occur [ 7 , 8 ].…”