Abstract
Free standing diamond fibres with 125 μm diameter tungsten wire or carburised steel cores coated by chemical vapour deposition with ∼ 35 μm thick diamond were heated by passing an electric current through the cores. Tungsten wire cored fibres were heated to 1000°C in a vacuum without any visible change in the fibres. In air the diamond oxidised above ∼550°C. The diamond fibres with the carburised steel core reached a maximum temperature of ∼ 200°C before melting at a local hot spot. This core was also ferromagnetic and thus the fibre had a unique combination of properties. Oxidation produced a large increase in the diamond surface area and this effect might be used to enhance heat transfer in diamond fibre sensors and in diamond fibre-metal matrix composite thermal conductors.
Get full access to this article
View all access options for this article.