Sol-gel silane dielectric coatings. a model system for thermally stable dielectromagnetic SMC's

S. N B Hodgson, Y. X. Pang, B. Weglinski, D. Gaworska, J. Koniarek

    Research output: Chapter in Book/Report/Conference proceedingConference contribution


    Dielectromagnetics are soft magnetic composites comprising iron powder functionalised with a thin continuous layer of electrical isolation, which is retained in-situ during processing to control eddy current losses in service. In recent years, a number of alternative proprietary compositions have been developed for such materials. Whilst it is clear that many of these offer substantial useful benefits, in terms of compaction behaviour, acceptable losses and improved magnetic permeability, the basis for these improvements remains largely unexplained, particularly for "thermally stable" chemically applied treatments such as phosphates, and there is relatively little scientific data to explain their function. For example are the improved characteristics a result of the chemical composition, coating thickness, coating contiguity, stress relief during heating, or improved density? This paper explores the effect of a simple silica coating as an essentially inert model system to explore systematically how the coating parameters influence magnetic and other physical properties.

    Original languageEnglish
    Title of host publicationEuro PM 2005
    Subtitle of host publicationPowder Metallurgy Congress and Exhibition
    PublisherEuropean Powder Metallurgy Association (EPMA)
    Number of pages6
    ISBN (Print)9781899072187
    Publication statusPublished - 1 Jan 2005
    EventEuropean Powder Metallurgy Congress and Exhibition 2005 - Prague, Czech Republic
    Duration: 2 Oct 20055 Oct 2005


    ConferenceEuropean Powder Metallurgy Congress and Exhibition 2005
    Abbreviated titleEuro PM 2005
    Country/TerritoryCzech Republic


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