JOURNAL OF JAPANESE SOCIETY OF TRIBOLOGISTS
Online ISSN : 2189-9967
Print ISSN : 0915-1168
ISSN-L : 0915-1168
Volume 62 , Issue 1
Special Issue on Tribology for Safe and Secure Life
Showing 1-14 articles out of 14 articles from the selected issue
Announcement
Contents
Foreword
Special Issue on Tribology for Safe and Secure Life
Explanation
Explanation
Original Contribution
  • Tomomi HONDA, Naoki TAKAOKA, Moritsugu KASAI, Yasunori SHIMIZU
    2017 Volume 62 Issue 1 Pages 43-51
    Published: January 15, 2017
    Released: January 15, 2017
    [Advance publication] Released: November 11, 2016
    JOURNALS FREE ACCESS

    High silicon content aluminum alloys are used in machine parts which need weight saving and wear resistance. The application of aluminum alloys in automotive engines is being undertaken. On the other hand, zinc dialkyldithiophosphate (ZnDTP) has been the most widely used lubricant additives in the engine, but it is known that ZnDTP can easily cause sludge and catalyst poisoning. Therefore the development of alternative additives has proceeded. In this study, friction and wear properties of the high silicon content aluminum alloys and CrN (chromium nitride) are investigated by using a block-on-ring type sliding tester in lubricating oils with ZnDTP or sulfur containing anti-wear agents. As a result, the friction coefficient in the case of ZnDTP was higher than that of non-additive. And the friction coefficient in the case of sulfur containing anti-wear agents were lower than that of non-additive. Both ZnDTP and sulfur containing anti-wear agents improved wear resistance. Tribofilms formed by the additive in the wear track affected the friction and wear properties.

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  • Takuya YAMANOUCHI, Deng XINGRUI, Yukio TANAKA, Noritsugu UMEHARA, Hiro ...
    2017 Volume 62 Issue 1 Pages 52-58
    Published: January 15, 2017
    Released: January 15, 2017
    [Advance publication] Released: November 11, 2016
    JOURNALS FREE ACCESS

    Carbon coatings have a keen attention according to its low friction, high hardness and high wear resistance properties. There are needs to apply carbon coatings into ceramic mechanical parts, such as mechanical seal. However the tribological properties of carbon coatings when slid against ceramics are still not investigated sufficiently. Generally tribological behaviors are affected by a counterpart material. Therefore more fundamental researches about counterpart material are necessary. In this research tribological behaviors of carbon coating when slid against various counterpart material, including SiC, SiC(O) that is SiC after annealing at 1000°C, Si3N4, Al2O3, Al2O3(Si) that includes more Si atomic concentration than Al2O3 and Si wafer at various temperatures in air have been investigated. Carbon coating when slid against SiC showed the lowest wear rate at 23°C, and carbon coating when slid against Si3N4 showed the lowest wear rate at 140°C and carbon coating when slid against SiC(O) showed the lowest friction coefficient at all temperature.

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