Microstructural Evolution and Oxidation Resistance of Multi-walled Carbon Nanotubes in the Presence of Silicon Powder at High Temperatures

材料科学技术（英文）, 2012, 28(7): 599-605.

Microstructural Evolution and Oxidation Resistance of Multi-walled Carbon Nanotubes in the Presence of Silicon Powder at High Temperatures

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1.The Key State Laboratory Breeding Base of Refractories and Ceramics, Wuhan University of Science and Technology,Wuhan 430081, China

2.The Key State Laboratory Breeding Base of Refractories and Ceramics, Wuhan University of Science and Technology,Wuhan 430081, China

3.The Key State Laboratory Breeding Base of Refractories and Ceramics, Wuhan University of Science and Technology,Wuhan 430081, China

4.The Key State Laboratory Breeding Base of Refractories and Ceramics, Wuhan University of Science and Technology,Wuhan 430081, China

5.The Key State Laboratory Breeding Base of Refractories and Ceramics, Wuhan University of Science and Technology,Wuhan 430081, China

关键词：多壁碳纳米管 , 抗氧化性能 , 组织演变 , 高分辨透射电子显微镜 , 硅粉 , 差示扫描量热法 , SiC涂层 , 高温

Microstructural Evolution and Oxidation Resistance of Multi-walled Carbon Nanotubes in the Presence of Silicon Powder at High Temperatures

Keywords： Multi-walled carbon nanotubes (MWCNTs) , Coating , SiC nanowires , Oxidation resistance , Oxidation activation energy ,

The microstructural evolution and oxidation resistance of multi-walled carbon nanotubes （MWCNTs） by di- rectly heating silicon powder and MWCNTs in a coke bed from 1000 to 1500 ~C are investigated with the aid of X-ray diffraction （XRD）, scanning electron microscopy （SEM）, high resolution transmission electron microscopy （HRTEM） and thermogravimetry-differential scanning calorimetry （TG-DSC）. The results showed that the morphology and microstructure of MWCNTs did not change much after being treated from 1000 ~C to 1200 ~C. An obvious SiC coating was formed on the surface of MWCNTs from 1300 to 1400 ~C. Up to 1500 ~C, nearly all the MWCNTs transformed into SiC nanowires. The oxidation resistance of the treated MWCNTs was improved compared with as-received ones. Non-isothermal kinetics showed that the oxidation activation energy of the treated MWCNTs reached 208 kJ/mol, much higher than 264 k J/tool of as-received ones.

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Microstructural Evolution and Oxidation Resistance of Multi-walled Carbon Nanotubes in the Presence of Silicon Powder at High Temperatures

Microstructural Evolution and Oxidation Resistance of Multi-walled Carbon Nanotubes in the Presence of Silicon Powder at High Temperatures

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