Study On The In-situ Synthesis Of Nanofiber And Properties Of Micro-pore Carbon Brick

The properties and the research status of micro-pore carbon brick have been introduced. The preparation and properties of carbon nanotubes/carbon nanofibers have been discussed.The effect of graphite, silicon and alundum powder on the properties of micro-pore carbon brick, especially micro-pore and thermal conductivity, has been explored by using different addition of three kinds of additives. The results showed that the additives can promote micro-pore and thermal conductivity of carbon brick and increase its bulk and decrease its apparent porosity because of the formation of SiC(w) reaction.Carbon nanofibers were synthesised in-situ by catalytic pyrolysis method using coal-tar pitch or phenolic resin as the raw material, transitional metal salts (Ni(NO₃)₂·6H₂O,Co(NO₃)₂·6H₂O,NiC₂O₄·2H₂O,CoC₂O₄·4H₂O,Fe(NO₃)₃·9H₂O and (C₅H₅)₂Fe) and nano metal powders(Ni and Co) as the catalyst in Ar atmosphere. The effect of the carbonization temperature, the kind and addition of catalysts and raw material on morphology of carbon nanofibers was studied.In-situ carbon nanofibers were characterized by SEM, TEM and XRD. The mechanism of the synthesis of in-situ carbon nanofibers was discussed initially. The results showed that carbon nanofibers growthing in the holes were synthesized using coal-tar pitch or phenolic resin alone as the raw material.1000℃is the appropriate temperature for carbonization and catalysts of Ni(NO₃)₂·6H₂O and Co(NO₃)₂·6H₂O are better than others. Varieties of morphology of carbon nanofibers are attributed to the complexity of coal-tar pitch and phenolic resin.The application of carbon nanofibers synthesized in-situ by catalytic pyrolysis method in micro-pore carbon brick was researched. The effect of different kinds of catalyst on micro-pore, thermal conductivity and microstructure of micro-pore carbon brick was discussed. The results showed that the properties of micro-pore carbon brick can improve a little but insignificant result from that most of carbon nanofibers presumably had converted into SiC(w) in micro-pore carbon brick.