Wear and friction of unio crassus shell in dry sliding contact with steel

Juha-Pekka Hirvonen, Reijo Lappalainen, Jari Koskinen, Jari Likonen, Marketta Pekkarinen

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

    8 Citations (Scopus)


    Biological materials such as shells possess a useful combination of mechanical properties. For instance, good fracture toughness combined with a relatively high hardness has been reported. The response of these properties to a tribological performance could presumably be very beneficial. Unfortunately no such research has been reported, although this kind of information is invaluable in possible utilization of biomimetic or biological processes in producing of materials.

    In this work chemical composition of Unio Crassus shells were characterized using secondary ion mass spectroscopy (SIMS) and Rutherford backscattering spectroscopy (RBS) and the microstructure was determined with X-ray diffraction (XRD) and scanning electron microscopy (SEM). Specimens of 20×10 mm in size with a thickness of a few millimetres were cut and mechanically polished followed by ultrasonic cleaning in deionized water. Wear and friction measurements were performed in a pin-on-disc tester with a hardened steel pin 6 mm in diameter as a counter face. Tests were carried out in a relative humidity of 50% at room temperature with a sliding speed of 15 mm/s. The measurements indicate a friction coefficient of 0.3–0.4 which is reasonable low. Moreover, wear resistance was found to be excellent. The wear resistance of the material was similar to those of the best synthetic diamond-like carbon films. The storage of the specimen at room temperature for 150 days deteriorated the material resulting in much worse tribological properties.
    Original languageEnglish
    Title of host publicationBiomolecular Materials by Design
    Subtitle of host publicationSymposium S
    EditorsMark Alper, Hagan Bayley, David Kaplan, Manuel Navia
    Place of PublicationPittsburgh
    PublisherMaterials Research Society
    ISBN (Print)978-1-5589-9229-0
    Publication statusPublished - 1994
    MoE publication typeA4 Article in a conference publication
    EventMaterials Research Society Fall Meeting 1993 - Boston, United States
    Duration: 29 Nov 19933 Dec 1993

    Publication series

    SeriesMaterials Research Society Symposia Proceedings


    ConferenceMaterials Research Society Fall Meeting 1993
    Country/TerritoryUnited States


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