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A method and apparatus for manufacturing composite materials are provided. In a first<br />
embodiment, a binding material is placed on a heat-resistant filter that is placed on hollow<br />
particles in a pressurizable container. Under pressure and heat, the binding material flows<br />
through the filter and infiltrates the spaces between the hollow particles. In a further<br />
embodiment, composite material wire is produced by coating the surfaces of inorganic fiber<br />
bundles with a metal oxide by dipping in a solution of a hydrolyzable organic metal compound<br />
and hydrolyzing and heat-treating prior to continuous infiltration under pressure.