Fabrication and properties of Al-infiltrated RBAO-based composites

Suxing Wu, A.J. Gesing, N.A. Travitzky, N.R. Claussen

    Research output: Contribution to journalArticleAcademicpeer-review

    46 Citations (Scopus)

    Abstract

    The reaction-bonded Al2O3 (RBAO) process is applied to fabricate open porosity Al2O3-based composites with SiC and Al2O3 particulate inclusions. These are then gas-pressure infiltrated with liquid aluminum. The Al-infiltrated composites exhibit strongly improved mechanical properties, e.g. fracture toughness and bond strength of samples containing 30 vol.% 13 µm diameter Al2O3 platelets are enhanced 1·6 to 5·8 MPavm and from 85 to 760 MPa, respectively. In all cases, crack bridging by ductile Al ligaments is the main toughening mechanism. Filling of void defects, caused by particulate agglomeration, with Al is especially effective in reducing the strength-controlling flaw size.
    Original languageEnglish
    Pages (from-to)277-281
    Number of pages5
    JournalJournal of the European Ceramic Society
    Volume7
    Issue number5
    DOIs
    Publication statusPublished - 1991

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