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Chemically Bonded Composite Sol–Gel Alumina Coatings

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This communication introduces chemically bonded (CB) composite sol–gel (SG) technology. The composite includes majority (>80 vol%) particulate filler, the balance being SG-derived bonding phase. Ceramic bond formation in such a composite is induced through chemical reaction rather than through sintering. In the particular variant of the process presented here, the reactivity of the SG-derived alumina ceramics toward phosphates, such as aluminum phosphate or phosphoric acid, is explored to produce a ceramic (reaction) bond in the system without sintering. This allows attaining structural integrity of the composite at relatively low temperatures of 300°C. Several examples of 40–200 m thick films of CB alumina on stainless steel, Mg and Al, Ni, and on carbon fiber-reinforced epoxy are discussed.

Document Type: Research Article

DOI: http://dx.doi.org/10.1111/j.1551-2916.2005.00490.x

Affiliations: Materials Engineering Department, UBCeram—The University of British Columbia, Vancouver, BC, Canada V6T 1Z4

Publication date: September 1, 2005

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