Tribological properties and bearing application of Mo-based films in space environment

Shi, Jiadong; Guo, Ma; Li, Guolu; Liu, Yunfan; Liu, Qian

doi:10.1016/j.vacuum.2021.110217

Cited by 9 publications

(2 citation statements)

References 30 publications

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“…Generally, reciprocating and rotating [23] modes are the primary forms of material testing, which are mainly designed to test the bulk material of the plate shape. Alternatively, using tribometers as parts must meet different size specifications of the moving part, such as a high-temperature tribometer for bushing [24] and life-testing tribometer for bearings [25] and gears [26]. Therefore, to develop a coated SSPBs tribometer in a vacuum environment, it is necessary to clarify its object characteristics, main motion forms, and failure evaluation methods.…”

Section: Requirement Definition and Overall Designmentioning

confidence: 99%

Novel Tribometer for Coated Self-Lubricating Spherical Plain Bearings in a Vacuum

Zhang

Yong

et al. 2022

Lubricants

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Coated self-lubricating spherical plain bearings (SSPBs) are a fairly key component of the space-swing mechanism. To examine the operation status and tribological properties of coated SSPBs, a tribometer with a temperature control module in a vacuum condition was developed. The tribometer was mainly composed of a fixture system, reciprocating rotational motion system, environment control system, etc. First, the tribometer was verified with the self-made hydrogenated diamond-like carbon (H-DLC) SSPBs. The sensor signals indicated that the tribometer conformed to the design specifications. Then, the influence of friction heat on the tribological properties of H-DLC SSPBs was analyzed. The results showed that friction torque and temperature increased with the overall test time. Although the temperature had reached 48 °C, the frictional heat had little effect on the H-DLC SSPBs’ lifespans. The damage mechanism of H-DLC SSPBs was dominated by abrasive wear and fatigue wear in vacuum conditions.

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Section: Requirement Definition and Overall Designmentioning

confidence: 99%

Novel Tribometer for Coated Self-Lubricating Spherical Plain Bearings in a Vacuum

Zhang

Yong

et al. 2022

Lubricants

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“…XPS confirms the oxidation of MoS 2 and the formation of MoO 3 , in turn (Tagawa 2012)[73]. Shi et al (2021) investigated the tribological behaviour of Mo/MoS 2 -X (X = Pb, PTFE and C)[74]. The composition of films were examined by XPS, which suggested the formation of MoO2 in Mo/MoS 2 -Pb-PbS, MoO 3 , C-F 2 , C-F group in Mo/MoS 2 -PTFE due to vulcanization and large amount of sp 2 hybridization in Mo/MoS 2 -C coatings.…”

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confidence: 96%

The state of art on lubrication methods in space environment

Nautiyal,

Singh,

Gautam

et al. 2024

Phys. Scr.

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Space tribology is a very big aspect of space exploration, despite of this fact, there is a dearth of coherent and concise literature available in the field of space tribology. It becomes difficult to understand the tribological behaviour of mating bodies under the extreme environmental circumstances in space due to their potential chemical and physical interactions. The radiation, vacuum, environmental conditions and temperature, are the factors which affects the friction and wear behaviour of mating surfaces and may alter the chemical structure of solid or liquid lubricant. The combination of tribo-physical and tribo-chemical interactions makes the tribological analysis very difficult to understand. The lack of understanding and ignorance might be the reason for not addressing this issue in the past. This review contains the qualitative and quantitative information on the tribological behaviour of different types of liquid lubricants, greases, soft and hard coatings, combined lubrication systems, testing equipment, composites, solid lubricants and alloys developed for space applications.

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