Protective coatings for commercial particulates

B. Kindl, Y.H. Teng, Y.L. Liu

    Research output: Contribution to journalConference articleResearchpeer-review


    SiC/Al composites are in large-scale production with Al-Si alloy matrices. The same composites with pure Al or low Si matrices need diffusion barriers on the SiC reinforcement to control the interfacial reaction. The present paper describes various approaches taken to obtain protective coatings of alumina and zirconia on SiC particulates by sol-gel techniques. Aqueous and organic precursors have been used. The extent of the reaction, i.e., the Si and Al4C3 content in the matrix, was determined by differential thermal analysis and X-ray diffraction. The reaction rates of some coated particulates in liquid Al are decreased by as much as one order of magnitude during the first 15 min of immersion. Pretreatments of the SiC surface, the composition and thickness of the coating interphase and heat treatments of the coated materials have been studied, and are discussed in relation to their effect on the control of reaction rates.
    Original languageEnglish
    Issue number7
    Pages (from-to)671-676
    Publication statusPublished - 1994
    Event3rd International Conference on Interfacial Phenomena in Composite Materials (IPCM '93) - Cambridge, United Kingdom
    Duration: 13 Sep 199316 Sep 1993
    Conference number: 3


    Conference3rd International Conference on Interfacial Phenomena in Composite Materials (IPCM '93)
    Country/TerritoryUnited Kingdom


    • SiC/Al interface
    • Interfacial reactions
    • Protective coatings
    • X-ray diffraction


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