Development of Functional Carbon Material by Pressure Pyrolysis of Organometallic Compounds

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Many kinds of carbons dispersed with magnetic particles could be successfully synthesized by pressure pyrolysis using a hydrothermal apparatus. In this method, homogeneous precursor solutions were prepared by mixing an organic solvent with organometallic compounds such as ferrocene derivatives. After copolymerization of this solution, pressure pyrolysis was carried out in the temperature range 500-700ﾟC. The carbonization efficiency was as high as about 70% since the pyrolysis was proceeded in the close system under pressure. Metal, metal alloy, metal carbide and metal oxide can be selected as a dispersed magnetic particles to get desired magnetic properties. These magnetic particles are highly dispersed in the carbon matrix as a single domain. The morphologies of the carbons changed depending on the metal contents and pyrolysis conditions. The pressure pyrolysis of organic precursors takes place with microphase separation in liquid phase, resulting in the morphological control of the produced carbons. Among these carbons, ferrite dispersed carbons show the attractive properties because of wide range coercive force and high saturation magnetization. These carbons are expected to be applied extensively for catalyst, mechanical bearing, magnetic shield and others.