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Carbon Nanotubes:Application in Carbon Containing Refractories

作者:Yawei Li, Ming Luo

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刊名:refractories worldforum

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出版年:2012-04-01

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期:3

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語種:英文

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Carbon nanotubes (CNTs) possess many unique mechanical proper- ties and are considered as a new carbon source to develop high-performance carbon containing refractories. However, the problems with CNTs are involved in that they can easily transform into ceramic phases or be oxidized at high temperatures and difficult to homogeneously disperse in the matrix when they are incorporated into carbon containing refractories. Some research work has been carried out to solve the problems mentioned above in the present paper. Firstly, the microstructural evolution of multi-walled carbon nanotubes (MWCNTs) in the presence of different silicon sources such as silicon powder (Si), mixture of aluminium and silica powders (Al+SiO2) and mixture of silicon and silica powders (Si+SiO2) was studied in a coke bed in the temperature range from 1000-1500 °C. Secondly, the coating technology was adopted to form ceramic phases on the surface of MWCNTs using polycarbosilane (PCS) as precursor in order to improve their oxidation resistance. Thirdly, in-situ formation of CNTs in the Al2O3-C matrixes by the pyrolysis of phenolic resin was studied to make them homogeneous dispersion in the matrix. Finally, the influence of in-situ formed CNTs and ceramic whiskers on the mechanical properties of Al2O3-C refractories was studied after coking from 800 to 1400°C.

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