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13th December 2018, Osaka

Progress with metal-ceramic composites

Upper left: This is a structure of Ti-dispersed AI2O3 composites. Lower left: Ti content dependency of fracture roughness and electrical resistivity. Middle: Nanostructure of the surface of AI2O3 composites produced via chemical and heat treatments. Right: Discolouration by the photocatalytic activity of AI2O3 composites after chemical and heat treatments. © University of OsakaResearchers at Osaka University have developed a method for manufacturing composites of alumina ceramics and titanium.

Various types of metal-ceramic composite have been researched and developed, the researchers say, but their combination and fine structures have been limited. In particular, the combination of ceramics such as alumina used as matrices and titanium – a biocompatible metal – has proved problematic, in that the structure of the composites achieved has not been uniform. This is due to the high reactivity of titanium – oxidation happens and chemical compounds are produced – and the large particle size of commercially-available titanium powders, of several tens of micrometres.

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