低温乾溜ピッチコークスを利用した等方性・高密度炭素材

概要

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Active carbonaceous fine powders were prepared by a distillation of a coal-tar pitch at various temperature and by a subsequent extraction with benzene. A high-dense, high-strength and isotropic carbon block was successfully manufactured with no-binder by the usual sintering method of oxide ceramics. In this study BS (benzene soluble)-fraction does not improve the green density, and the amount of excess BS-fraction is responsible for foaming and deformation of a carbon block during heat-treatment. Therefore it was found BS-fraction was not necessary to be contained in a moulding method. On the other hand, β-fraction, which is not dissolved in benzene but is dissolved in qinoline, promotes the shrinkage of carbon block during heattreatment, and develops its strength. Sintering behavior of β-fraction is apparently like a liquid-phase sintering.For example, the powder which was prepared by distillating at 500°C and extracting with benzene, was pressed at 2800kg/cm2, and then heated up to 1800°C. The resulting carbon block was isotropic; its bulk density was 1.91g/cm3 and the compressive strength was 2610kg/cm2.
社団法人日本セラミックス協会の論文
1976-11-01