Wear characteristics of water-lubricated SiC journal bearings in intermittent motion

Peter Andersson (Corresponding Author), Antti-Pekka Nikkilä, Pekka Lintula

    Research output: Contribution to journalArticleScientificpeer-review

    16 Citations (Scopus)

    Abstract

    In water-lubricated journal bearing geometries, silicon carbide (SiC) offers a load-carrying capability that is higher than that of most other structural ceramics. This superiority derives from the high hardness of SiC, its good thermal conductivity and its ability to form water-soluble wear products and smooth surfaces when sliding in water. Once the smooth sliding surfaces have been formed, the subsequent sliding procedure will rely on a water film, and the wear of SiC terminates. However, in many situations it is important to know the wear characteristics of SiC materials in repeated start-up events in which the conditions in the sliding interface evolve from static friction through boundary and mixed lubrication, comprising some wear, into an equilibrium of hydrodynamic lubrication. For studying the wear characteristics of water-lubricated SiC journal bearings in intermittent motion, a series of journal bearing tests were carried out. During each test, 10 000 start-up procedures and a total sliding distance of 100 km were used. The normal forces were 2.5 and 4 kN, and the maximum sliding velocity was 1 m s−1. During the tests, the bearing temperature and the friction force were recorded, while the wear was determined after the tests. All the materials studied were worn mainly by tribochemical polishing, which resulted in smooth surfaces with distributed tiny scratches. All wear rates were very low, and the wear rates of the SiC materials at the respective loads were all within a quite narrow range. Due to stronger tribochemical wear of the Si phase, the SiSiC material experienced slightly more wear than the SiC materials. The C-SiSiC material studied was worn as little as the SiC materials, regardless of its soft graphite phase. This study shows that SiC-based materials can well be utilized for demanding journal bearing solutions operating under conditions of water-lubrication.
    Original languageEnglish
    Pages (from-to)57-62
    Number of pages6
    JournalWear
    Volume179
    Issue number1-2
    DOIs
    Publication statusPublished - 1994
    MoE publication typeA1 Journal article-refereed

    Fingerprint

    journal bearings
    Journal bearings
    Silicon carbide
    silicon carbides
    Wear of materials
    Water
    sliding
    water
    lubrication
    Lubrication
    Bearings (structural)
    silicon carbide
    Friction
    boundary lubrication
    Structural ceramics
    static friction
    Graphite
    Polishing
    polishing
    Thermal conductivity

    Cite this

    Andersson, Peter ; Nikkilä, Antti-Pekka ; Lintula, Pekka. / Wear characteristics of water-lubricated SiC journal bearings in intermittent motion. In: Wear. 1994 ; Vol. 179, No. 1-2. pp. 57-62.
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    title = "Wear characteristics of water-lubricated SiC journal bearings in intermittent motion",
    abstract = "In water-lubricated journal bearing geometries, silicon carbide (SiC) offers a load-carrying capability that is higher than that of most other structural ceramics. This superiority derives from the high hardness of SiC, its good thermal conductivity and its ability to form water-soluble wear products and smooth surfaces when sliding in water. Once the smooth sliding surfaces have been formed, the subsequent sliding procedure will rely on a water film, and the wear of SiC terminates. However, in many situations it is important to know the wear characteristics of SiC materials in repeated start-up events in which the conditions in the sliding interface evolve from static friction through boundary and mixed lubrication, comprising some wear, into an equilibrium of hydrodynamic lubrication. For studying the wear characteristics of water-lubricated SiC journal bearings in intermittent motion, a series of journal bearing tests were carried out. During each test, 10 000 start-up procedures and a total sliding distance of 100 km were used. The normal forces were 2.5 and 4 kN, and the maximum sliding velocity was 1 m s−1. During the tests, the bearing temperature and the friction force were recorded, while the wear was determined after the tests. All the materials studied were worn mainly by tribochemical polishing, which resulted in smooth surfaces with distributed tiny scratches. All wear rates were very low, and the wear rates of the SiC materials at the respective loads were all within a quite narrow range. Due to stronger tribochemical wear of the Si phase, the SiSiC material experienced slightly more wear than the SiC materials. The C-SiSiC material studied was worn as little as the SiC materials, regardless of its soft graphite phase. This study shows that SiC-based materials can well be utilized for demanding journal bearing solutions operating under conditions of water-lubrication.",
    author = "Peter Andersson and Antti-Pekka Nikkil{\"a} and Pekka Lintula",
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    Wear characteristics of water-lubricated SiC journal bearings in intermittent motion. / Andersson, Peter (Corresponding Author); Nikkilä, Antti-Pekka; Lintula, Pekka.

    In: Wear, Vol. 179, No. 1-2, 1994, p. 57-62.

    Research output: Contribution to journalArticleScientificpeer-review

    TY - JOUR

    T1 - Wear characteristics of water-lubricated SiC journal bearings in intermittent motion

    AU - Andersson, Peter

    AU - Nikkilä, Antti-Pekka

    AU - Lintula, Pekka

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    PY - 1994

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    N2 - In water-lubricated journal bearing geometries, silicon carbide (SiC) offers a load-carrying capability that is higher than that of most other structural ceramics. This superiority derives from the high hardness of SiC, its good thermal conductivity and its ability to form water-soluble wear products and smooth surfaces when sliding in water. Once the smooth sliding surfaces have been formed, the subsequent sliding procedure will rely on a water film, and the wear of SiC terminates. However, in many situations it is important to know the wear characteristics of SiC materials in repeated start-up events in which the conditions in the sliding interface evolve from static friction through boundary and mixed lubrication, comprising some wear, into an equilibrium of hydrodynamic lubrication. For studying the wear characteristics of water-lubricated SiC journal bearings in intermittent motion, a series of journal bearing tests were carried out. During each test, 10 000 start-up procedures and a total sliding distance of 100 km were used. The normal forces were 2.5 and 4 kN, and the maximum sliding velocity was 1 m s−1. During the tests, the bearing temperature and the friction force were recorded, while the wear was determined after the tests. All the materials studied were worn mainly by tribochemical polishing, which resulted in smooth surfaces with distributed tiny scratches. All wear rates were very low, and the wear rates of the SiC materials at the respective loads were all within a quite narrow range. Due to stronger tribochemical wear of the Si phase, the SiSiC material experienced slightly more wear than the SiC materials. The C-SiSiC material studied was worn as little as the SiC materials, regardless of its soft graphite phase. This study shows that SiC-based materials can well be utilized for demanding journal bearing solutions operating under conditions of water-lubrication.

    AB - In water-lubricated journal bearing geometries, silicon carbide (SiC) offers a load-carrying capability that is higher than that of most other structural ceramics. This superiority derives from the high hardness of SiC, its good thermal conductivity and its ability to form water-soluble wear products and smooth surfaces when sliding in water. Once the smooth sliding surfaces have been formed, the subsequent sliding procedure will rely on a water film, and the wear of SiC terminates. However, in many situations it is important to know the wear characteristics of SiC materials in repeated start-up events in which the conditions in the sliding interface evolve from static friction through boundary and mixed lubrication, comprising some wear, into an equilibrium of hydrodynamic lubrication. For studying the wear characteristics of water-lubricated SiC journal bearings in intermittent motion, a series of journal bearing tests were carried out. During each test, 10 000 start-up procedures and a total sliding distance of 100 km were used. The normal forces were 2.5 and 4 kN, and the maximum sliding velocity was 1 m s−1. During the tests, the bearing temperature and the friction force were recorded, while the wear was determined after the tests. All the materials studied were worn mainly by tribochemical polishing, which resulted in smooth surfaces with distributed tiny scratches. All wear rates were very low, and the wear rates of the SiC materials at the respective loads were all within a quite narrow range. Due to stronger tribochemical wear of the Si phase, the SiSiC material experienced slightly more wear than the SiC materials. The C-SiSiC material studied was worn as little as the SiC materials, regardless of its soft graphite phase. This study shows that SiC-based materials can well be utilized for demanding journal bearing solutions operating under conditions of water-lubrication.

    U2 - 10.1016/0043-1648(94)90219-4

    DO - 10.1016/0043-1648(94)90219-4

    M3 - Article

    VL - 179

    SP - 57

    EP - 62

    JO - Wear

    JF - Wear

    SN - 0043-1648

    IS - 1-2

    ER -