Sulfur-containing molybdenum compounds as high-performance lubricant additives (Review)

Parenago, O. P.; Kuz’mina, G. N.; Zaimovskaya, Tatiana A.

doi:10.1134/s0965544117080102

Cited by 28 publications

(13 citation statements)

References 54 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…According to the research results, , the basal plane surfaces for MoS 2 film crystals are more convenient separation sites of the crystals than edge plane areas and have an effect on the lubrication. Besides, it is interesting that the basal planes of lamellar solids, similar to MoS 2 , display strong affinities for nonpolar hydrocarbon compounds, unlike the edge sites absorbing polar compounds. ,− The affinity between the MoS 2 film and gel is beneficial in creating synergistic lubrication between them. The relationship between the two is similar to the depiction of “Yin-Yang” of “Taiji” in traditional Chinese culture.…”

Section: Resultsmentioning

confidence: 99%

MoS₂ Lubricating Film Meets Supramolecular Gel: A Novel Composite Lubricating System for Space Applications

Zhang

Jiang

Wang

et al. 2021

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

In the field of space mechanical lubrication, to improve the reliability and life of space lubrication, solid lubricating film–liquid lubricant composite lubrication has been used in recent years. This lubrication method can improve the durability of sliding friction mating surfaces, reduce equipment wear, and extend the service life of motion mechanisms. However, due to unstable factors such as volatilization and creeping of liquid lubricants in microgravity and ultra-high-vacuum environments, the solid lubricating film wears out after long-term use and produces wear debris and other unfavorable factors. To solve the above problems, this study proposes a novel composite lubrication system constituting a MoS2 film in combination with a supramolecular gel. The tribological performance of this lubrication system establishes an extended service life with a lower wear rate compared to the MoS2 film, regardless of functioning in vacuum or atmospheric conditions. More importantly, the results of the irradiation experiment demonstrate that MoS2–gel exhibits better anticreep performance as compared to MoS2–oil when exposed to atomic oxygen and ultraviolet light for 4 h. The analysis of this composite lubrication mechanism also reveals the formation of a continuous transfer film on the surface of the friction pairs by virtue of the outstanding synergistic effect between the MoS2 film and the gel. MoS2 debris is present in the gel as an additive, and the gel is capable of replenishing automatically once the MoS2 film is depleted. Moreover, the strong anticreep properties of the gel are attributable to the multialkylated cyclopentane oil being trapped by the intricate reassembling of the gelator network. It is firmly believed that this novel MoS2–gel composite lubrication system may have good prospective applications in space and special machinery domains.

show abstract

Section: Resultsmentioning

confidence: 99%

MoS₂ Lubricating Film Meets Supramolecular Gel: A Novel Composite Lubricating System for Space Applications

Zhang

Jiang

Wang

et al. 2021

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

show abstract

“…However, the more and more strict requirements for reducing emission and fuel cost as well as saving energy and material demand that DLC/lubricant system exhibits improved tribological properties, especially good friction-reducing performance. In this sense, organic molybdenum compound like molybdenum dialkyl dithiocarbamate (MoDTC) could be of particular significance, since MoDTC as the friction modifier of lubricating grease exhibits outstanding friction-reducing effect and mechanical efficiency [3]. To our disappointment, MoDTC leads to severe wear of DLC coating [4][5][6][7][8][9][10][11], because it can react with DLC coating to generate molybdenum carbide grains and cause abrasive wear of DLC coating [12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Synergistic tribological effect between polyisobutylene succinimide-modified molybdenum oxide nanoparticle and zinc dialkyldithiophosphate for reducing friction and wear of diamond-like carbon coating under boundary lubrication

et al. 2023

View full text Add to dashboard Cite

Organic molybdenum lubricant additive like molybdenum dialkyl dithiocarbamate (MoDTC) can cause wear acceleration of diamond-like carbon (DLC) coating coupled with steel under boundary lubrication, which hinders its industrial application. Therefore, polyisobutylene succinimide (PIBS), an organo molybdenum amide, was adopted to modify molybdenum oxide affording molybdenum polyisobutylene succinimide-molybdenum oxide nanoparticles (MPIBS-MONPs) with potential to prevent the wear acceleration of DLC coating. The thermal stability of MPIBS-MONPs was evaluated by thermogravimetric analysis. Their tribological properties as the additives in di-isooctyl sebacate (DIOS) were evaluated with MoDTC as a control; and their tribomechanism was investigated in relation to their tribochemical reactions and synergistic tribological effect with zinc dialkyldithiophosphate (ZDDP) as well as worn surface characterizations. Findings indicate that MPIBS-MONPs/ZDDP added in DIOS can significantly reduce the friction and wear of DLC coating, being much superior to MoDTC. This is because MPIBS-MONPs and ZDDP jointly take part in tribochemical reactions to form a composite tribofilm that can increase the wear resistance of DLC coating. Namely, the molybdenum amide on MPIBS-MONPs surface can react with ZDDP to form MoS2 film with excellent friction-reducing ability; and MPIBS-MONPs can release molybdenum oxide nanoparticle to form deposited lubrication layer on worn surfaces. The as-formed composite tribofilm consisting of molybdenum oxide nanocrystal, amorphous polyphosphate, and molybdenum disulfide as well as a small amount of Mo2C accounts for the increase in the wear resistance of DLC coating under boundary lubrication.

show abstract

“…In addition, due to its size effect and activity, molybdenum nano-powders are often used as magnetic materials, metallurgical additives, chemical catalysts, etc. [ 11 , 12 , 13 , 14 ]. Mo nano-powders can be prepared by many methods such as high-energy ball milling, electric explosion, and other complex chemical reaction methods [ 15 , 16 , 17 , 18 , 19 ].…”

Section: Introductionmentioning

confidence: 99%

Controllable Preparation of Spherical Molybdenum Nano-Powders by One-Step Reduction of APM in Radio Frequency Hydrogen Plasma

Wang

Chen

et al. 2022

Materials

View full text Add to dashboard Cite

Spherical molybdenum nano-powders were in-situ ultrafast synthesized from ammonium paramolybdate (APM) raw materials in a one-step reduction method by radio frequency (RF) hydrogen plasma. Due to the extreme conditions of the RF plasma torch such as its high temperature and large temperature gradient, the injected raw APM powder was quickly gasified and then reduced into nano-sized metal molybdenum (Mo) powder. The influences of APM powder delivery rate and H2 concentration on the properties of the obtained powders were investigated. Field-emission scanning electron microscope (FESEM), transmission electron microscope (TEM), X-ray diffraction (XRD), nanolaser particle analyzer, and specific surface area method were used to characterize the morphology, phase, and particle size distribution of the powders. The results showed that the nano-sized Mo powder obtained by hydrogen plasma treatment had a quasi-spherical morphology and an average particle size of about 30 nm. The particle size could be successfully adjusted by varying H2 concentrations. In addition, spherical nano-sized MoO3 powder could be obtained when no H2 was added into the RF plasma.

show abstract

Sulfur-containing molybdenum compounds as high-performance lubricant additives (Review)

Cited by 28 publications

References 54 publications

MoS₂ Lubricating Film Meets Supramolecular Gel: A Novel Composite Lubricating System for Space Applications

MoS₂ Lubricating Film Meets Supramolecular Gel: A Novel Composite Lubricating System for Space Applications

Synergistic tribological effect between polyisobutylene succinimide-modified molybdenum oxide nanoparticle and zinc dialkyldithiophosphate for reducing friction and wear of diamond-like carbon coating under boundary lubrication

Controllable Preparation of Spherical Molybdenum Nano-Powders by One-Step Reduction of APM in Radio Frequency Hydrogen Plasma

Contact Info

Product

Resources

About

Sulfur-containing molybdenum compounds as high-performance lubricant additives (Review)

Cited by 28 publications

References 54 publications

MoS2 Lubricating Film Meets Supramolecular Gel: A Novel Composite Lubricating System for Space Applications

MoS2 Lubricating Film Meets Supramolecular Gel: A Novel Composite Lubricating System for Space Applications

Synergistic tribological effect between polyisobutylene succinimide-modified molybdenum oxide nanoparticle and zinc dialkyldithiophosphate for reducing friction and wear of diamond-like carbon coating under boundary lubrication

Controllable Preparation of Spherical Molybdenum Nano-Powders by One-Step Reduction of APM in Radio Frequency Hydrogen Plasma

Contact Info

Product

Resources

About

MoS₂ Lubricating Film Meets Supramolecular Gel: A Novel Composite Lubricating System for Space Applications

MoS₂ Lubricating Film Meets Supramolecular Gel: A Novel Composite Lubricating System for Space Applications