Instability in the tribochemical wear of silicon carbide in unlubricated sliding contacts

Peter Andersson, Adam Blomberg

    Research output: Contribution to journalArticleScientificpeer-review

    45 Citations (Scopus)

    Abstract

    The present study is based on tests with sintered silicon carbide sliding unlubricated on itself in point (pin-on-disc), line (journal bearing) and plane (mechanical face seal) contacts. Tribo-oxidation and surface fracture were identified as the dominating deterioration mechanisms. The oxidation products formed were silicon dioxide and, within narrow operational regimes, silicon monoxide. Part of the silicon dioxide wear debris was compacted under frictional heating to form smooth tribofilms on the mating surfaces, providing protection against excessive wear; the corresponding specific wear rates ranged from 10−6 to 10−5 mm3 N−1 m−1. The silicon monoxide, when formed, appeared as a loosely attached powder which provided no protection against wear, as indicated by the one order of magnitude increase in the wear rates. The tribochemical instability has a potential to disturb the otherwise favourable SiC/SiC applications. The highest wear rates occurred in the pin-on-disc configuration, while the lowest rates were obtained in the journal bearing tests.
    Original languageEnglish
    Pages (from-to)1-7
    Number of pages7
    JournalWear
    Volume174
    Issue number1-2
    DOIs
    Publication statusPublished - 1994
    MoE publication typeA1 Journal article-refereed

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