The Experts below are selected from a list of 8496 Experts worldwide ranked by ideXlab platform

Qunji Xue - One of the best experts on this subject based on the ideXlab platform.

  • The friction and wear behavior of 2-(n-alkyldithio)-benzimidazole as additives in Liquid Paraffin
    Tribology Letters, 1999
    Co-Authors: Qunji Xue, Junyan Zhang, Weimin Liu, Shengrong Yang
    Abstract:

    Three 2-(n-alkyldithio)-benzimidazoles were synthesized. The friction and wear behavior of the synthetic compounds as additives in Liquid Paraffin were examined with a four-ball machine, with emphasis on revealing the relationship between the chain length of the additive and the friction-reducing ability and lubricating mechanism of the additives. The film formed by the additive during the sliding process was investigated by using X-ray photoelectron spectroscopy. It was found that the synthetic compounds as additives in Liquid Paraffin had good antiwear performance. The longer the chain length of the synthetic compound, the more stable or less volatile is the compound and the more effective it is in improving wear resistance.

  • The tribological behaviors of 2-mercaptobenzoxazole derivatives as additives in Liquid Paraffin
    Wear, 1998
    Co-Authors: Junyan Zhang, Zefu Zhang, Weimin Liu, Qunji Xue
    Abstract:

    Abstract Some potentially active heterocyclic compounds including 2-(di- n -octylaminomethyl) thiobenzoxazole were synthesized. The friction and wear behaviors of these potentially active heterocyclic compounds as additives in Liquid Paraffin were investigated on a four-ball machine. The tribochemical interaction between the additive and the counterface metal was explored with X-ray photoelectron spectroscopy. It was found that 2-(di- n -octylaminomethyl)-thiobenzoxazole was effective in reducing wear as a potential novel additive in Liquid Paraffin.

  • Tribological study of a mannich compound of 2-mercaptobenzimidazole in Liquid Paraffin
    Tribology International, 1998
    Co-Authors: Junyan Zhang, Weimin Liu, Qunji Xue
    Abstract:

    Tribological study on a 12.7 mm diameter steel ball bearing specimen has been carried out in a four-ball machine using a potentially active heterocyclic additive in Liquid Paraffin. The synthesis of 2-(di-n-butylaminomethyl) thiobenzimidazole is described. The 2-(di-n-butylaminomethyl) thiobenzimidazole has been found to be quite effective as a potential additive in Liquid Paraffin according to the results. Employing X-ray photoelectron spectroscopy, the film formed when the additive reacted with the metal was investigated.

  • Study on lubricating mechanisms of La(OH)3 nanocluster modified by compound containing nitrogen in Liquid Paraffin
    Wear, 1998
    Co-Authors: Zefu Zhang, Weimin Liu, Qunji Xue
    Abstract:

    Abstract In this paper, the tribological properties of La(OH) 3 nanocluster modified by compound containing nitrogen as additive in Liquid Paraffin were investigated using four-ball machine. The results show that La(OH) 3 nanocluster modified by compound containing nitrogen as additive in Liquid Paraffin has high load-carrying capacity, good antiwear and friction reduction properties. The lubricating mechanisms were studied by using EPM-810Q model electron probe microanalyzer (EPMA) and PHI-5702 multi-technique surface X-ray photoelectron spectrometer (XPS). The results show that the boundary film on the worn surface is made of physically adsorbing film (N-containing organic compound) and tribochemical reaction film (lanthanum oxide). The physically adsorbing film and tribochemical reaction film formed during friction contributed to good tribological properties of La(OH) 3 nanocluster modified by compound containing nitrogen as additive in Liquid Paraffin.

  • The friction and wear behaviors of some O-containing organic compounds as additives in Liquid Paraffin
    Wear, 1998
    Co-Authors: Junyan Zhang, Weimin Liu, Qunji Xue
    Abstract:

    Abstract The friction and wear behaviors of benzoic acid, benzoic alcohol, benzaldehyde, ethyl benzoate, and acetophenone as additives in Liquid Paraffin were examined on a four-ball machine. The morphologies of the worn surfaces were observed with scanning electron microscope. It was found that the antiwear ability of these compounds as additives in Liquid Paraffin at lower concentration ( benzoic alcohol > benzaldehyde > ethyl benzoate > acetophenone, which was in the same order of the polarity of these compounds. However, at higher concentration (>0.5 wt.%), the above sequence was ranked as benzoic alcohol > benzoic acid > benzaldehyde > ethyl benzoate > acetophenone, which was dominated by the different corrosiveness of the compounds. The rubbed surfaces were investigated using IR spectroscopy and the antiwear mechanism was discussed.

Iskander Tlili - One of the best experts on this subject based on the ideXlab platform.

  • experimental study of temperature and mass fraction effects on thermal conductivity and dynamic viscosity of sio2 oleic acid Liquid Paraffin nanofluid
    International Communications in Heat and Mass Transfer, 2020
    Co-Authors: Sajad Asadi, Arash Karimipour, Ali Abdollahi, Iskander Tlili
    Abstract:

    Abstract This paper presents the study of the influence of SiO2 nanoparticles, temperature and nanoparticles mass loads on the thermal conductivity of SiO2/Liquid Paraffin nanofluid in existence of oleic acid. Different temperatures and nano sized particles mass fractions ranging from 25 to 70 °C and 0.005% to 5%, respectively, were considered within the experimentations. The results clearly exhibited that the thermal conductivity of the nanofluid altered significantly with the temperature enhancement and by increasing in the mass fraction of the SiO2 nano sized particles in the basefluid, the thermal conductivity of the nanofluid raised. The empirical relation of the current research exhibits that for the relative thermal conductivity of SiO2-oleic acid/Liquid Paraffin nanofluid as parameters of nanoparticles mass fraction and temperature the extent of data deviation is lower than 10% and for that of the relative viscosity of the SiO2-oleic acid/Liquid Paraffin the data deviation is also

Sajad Asadi - One of the best experts on this subject based on the ideXlab platform.

  • experimental study of temperature and mass fraction effects on thermal conductivity and dynamic viscosity of sio2 oleic acid Liquid Paraffin nanofluid
    International Communications in Heat and Mass Transfer, 2020
    Co-Authors: Sajad Asadi, Arash Karimipour, Ali Abdollahi, Iskander Tlili
    Abstract:

    Abstract This paper presents the study of the influence of SiO2 nanoparticles, temperature and nanoparticles mass loads on the thermal conductivity of SiO2/Liquid Paraffin nanofluid in existence of oleic acid. Different temperatures and nano sized particles mass fractions ranging from 25 to 70 °C and 0.005% to 5%, respectively, were considered within the experimentations. The results clearly exhibited that the thermal conductivity of the nanofluid altered significantly with the temperature enhancement and by increasing in the mass fraction of the SiO2 nano sized particles in the basefluid, the thermal conductivity of the nanofluid raised. The empirical relation of the current research exhibits that for the relative thermal conductivity of SiO2-oleic acid/Liquid Paraffin nanofluid as parameters of nanoparticles mass fraction and temperature the extent of data deviation is lower than 10% and for that of the relative viscosity of the SiO2-oleic acid/Liquid Paraffin the data deviation is also

Weimin Liu - One of the best experts on this subject based on the ideXlab platform.

  • The tribological study of a tetrazole derivative as additive in Liquid Paraffin
    Wear, 2000
    Co-Authors: Tianhui Ren, Hong Liu, Dapu Wang, Weimin Liu
    Abstract:

    In order to investigate the tribological properties of the tetrazolyl group, one oil-soluble N-alkylated tetrazole derivative was synthesized. Its load-carrying capacity, anti-wear and friction reduction properties added to Liquid Paraffin were evaluated using a four-ball test machine and an Optimal SRV tester. The results indicate that the N-alkylated tetrazole derivative as an additive in Liquid Paraffin possesses good load-carrying capacity, excellent anti-wear and friction reduction properties. The chemical states of the nitrogen element on the worn surface were investigated using X-ray photoelectron spectroscopy (XPS).

  • An investigation of the tribological behaviour of surface-modified ZnS nanoparticles in Liquid Paraffin
    Wear, 2000
    Co-Authors: Weimin Liu, Shuang Chen
    Abstract:

    Abstract The di-n-hexadecyldithiophosphate (DDP) surface-modified ZnS nanoparticles were chemically prepared. The particle size of the DDP-coated ZnS nanoparticles was characterized by transmission electron microscopy (TEM). The antiwear ability of the coated ZnS nanoparticles as an additive in Liquid Paraffin was investigated using a four-ball machine. TEM image confirms that the average diameter of the DDP-coated ZnS nanoparticles is about 4 nm. Wear tests show that DDP-coated ZnS nanoparticles as additive in Liquid Paraffin is capable to reduce wear of steel even at an extremely low concentration. According to the results of X-ray photoelectron spectrometer (XPS) to the boundary film, a physically adsorbing and tribochemically reacted film with ZnS, ZnO, FeS, Fe2O3, SO42− and PO43− were formed during friction process, which is contributed to good tribological properties of DDP-coated ZnS nanoparticles.

  • The friction and wear behavior of 2-(n-alkyldithio)-benzimidazole as additives in Liquid Paraffin
    Tribology Letters, 1999
    Co-Authors: Qunji Xue, Junyan Zhang, Weimin Liu, Shengrong Yang
    Abstract:

    Three 2-(n-alkyldithio)-benzimidazoles were synthesized. The friction and wear behavior of the synthetic compounds as additives in Liquid Paraffin were examined with a four-ball machine, with emphasis on revealing the relationship between the chain length of the additive and the friction-reducing ability and lubricating mechanism of the additives. The film formed by the additive during the sliding process was investigated by using X-ray photoelectron spectroscopy. It was found that the synthetic compounds as additives in Liquid Paraffin had good antiwear performance. The longer the chain length of the synthetic compound, the more stable or less volatile is the compound and the more effective it is in improving wear resistance.

  • The tribological behaviors of 2-mercaptobenzoxazole derivatives as additives in Liquid Paraffin
    Wear, 1998
    Co-Authors: Junyan Zhang, Zefu Zhang, Weimin Liu, Qunji Xue
    Abstract:

    Abstract Some potentially active heterocyclic compounds including 2-(di- n -octylaminomethyl) thiobenzoxazole were synthesized. The friction and wear behaviors of these potentially active heterocyclic compounds as additives in Liquid Paraffin were investigated on a four-ball machine. The tribochemical interaction between the additive and the counterface metal was explored with X-ray photoelectron spectroscopy. It was found that 2-(di- n -octylaminomethyl)-thiobenzoxazole was effective in reducing wear as a potential novel additive in Liquid Paraffin.

  • Tribological study of a mannich compound of 2-mercaptobenzimidazole in Liquid Paraffin
    Tribology International, 1998
    Co-Authors: Junyan Zhang, Weimin Liu, Qunji Xue
    Abstract:

    Tribological study on a 12.7 mm diameter steel ball bearing specimen has been carried out in a four-ball machine using a potentially active heterocyclic additive in Liquid Paraffin. The synthesis of 2-(di-n-butylaminomethyl) thiobenzimidazole is described. The 2-(di-n-butylaminomethyl) thiobenzimidazole has been found to be quite effective as a potential additive in Liquid Paraffin according to the results. Employing X-ray photoelectron spectroscopy, the film formed when the additive reacted with the metal was investigated.

Junyan Zhang - One of the best experts on this subject based on the ideXlab platform.

  • The tribological properties of the heterocyclic compound containing S, N, O, and B as additive in Liquid Paraffin
    Wear, 1999
    Co-Authors: Junyan Zhang
    Abstract:

    In this paper, an organic compound containing S, N, B and O elements is synthesized with the reaction of 2-mercaptobenzothiazole and chloroethanol in aqueous solution firstly, then the product reacts with butanol and boric acid in toluene solution at reflex for 6 h. Its friction and wear properties as additives in Liquid Paraffin were evaluated using four-ball machine and antiwear mechanisms were investigated using X-ray photoelectron spectroscopy (XPS) and electron probe microanalysis (EPMA). Results show that the B-containing derivative of 2-mercaptobenzothiazole is effective at reducing the wear in Liquid Paraffin, but increases the friction coefficient of Liquid Paraffin.

  • The friction and wear behavior of 2-(n-alkyldithio)-benzimidazole as additives in Liquid Paraffin
    Tribology Letters, 1999
    Co-Authors: Qunji Xue, Junyan Zhang, Weimin Liu, Shengrong Yang
    Abstract:

    Three 2-(n-alkyldithio)-benzimidazoles were synthesized. The friction and wear behavior of the synthetic compounds as additives in Liquid Paraffin were examined with a four-ball machine, with emphasis on revealing the relationship between the chain length of the additive and the friction-reducing ability and lubricating mechanism of the additives. The film formed by the additive during the sliding process was investigated by using X-ray photoelectron spectroscopy. It was found that the synthetic compounds as additives in Liquid Paraffin had good antiwear performance. The longer the chain length of the synthetic compound, the more stable or less volatile is the compound and the more effective it is in improving wear resistance.

  • The tribological behaviors of 2-mercaptobenzoxazole derivatives as additives in Liquid Paraffin
    Wear, 1998
    Co-Authors: Junyan Zhang, Zefu Zhang, Weimin Liu, Qunji Xue
    Abstract:

    Abstract Some potentially active heterocyclic compounds including 2-(di- n -octylaminomethyl) thiobenzoxazole were synthesized. The friction and wear behaviors of these potentially active heterocyclic compounds as additives in Liquid Paraffin were investigated on a four-ball machine. The tribochemical interaction between the additive and the counterface metal was explored with X-ray photoelectron spectroscopy. It was found that 2-(di- n -octylaminomethyl)-thiobenzoxazole was effective in reducing wear as a potential novel additive in Liquid Paraffin.

  • Tribological study of a mannich compound of 2-mercaptobenzimidazole in Liquid Paraffin
    Tribology International, 1998
    Co-Authors: Junyan Zhang, Weimin Liu, Qunji Xue
    Abstract:

    Tribological study on a 12.7 mm diameter steel ball bearing specimen has been carried out in a four-ball machine using a potentially active heterocyclic additive in Liquid Paraffin. The synthesis of 2-(di-n-butylaminomethyl) thiobenzimidazole is described. The 2-(di-n-butylaminomethyl) thiobenzimidazole has been found to be quite effective as a potential additive in Liquid Paraffin according to the results. Employing X-ray photoelectron spectroscopy, the film formed when the additive reacted with the metal was investigated.

  • The friction and wear behaviors of some O-containing organic compounds as additives in Liquid Paraffin
    Wear, 1998
    Co-Authors: Junyan Zhang, Weimin Liu, Qunji Xue
    Abstract:

    Abstract The friction and wear behaviors of benzoic acid, benzoic alcohol, benzaldehyde, ethyl benzoate, and acetophenone as additives in Liquid Paraffin were examined on a four-ball machine. The morphologies of the worn surfaces were observed with scanning electron microscope. It was found that the antiwear ability of these compounds as additives in Liquid Paraffin at lower concentration ( benzoic alcohol > benzaldehyde > ethyl benzoate > acetophenone, which was in the same order of the polarity of these compounds. However, at higher concentration (>0.5 wt.%), the above sequence was ranked as benzoic alcohol > benzoic acid > benzaldehyde > ethyl benzoate > acetophenone, which was dominated by the different corrosiveness of the compounds. The rubbed surfaces were investigated using IR spectroscopy and the antiwear mechanism was discussed.