Low Temperature Oxidation Behaviors of CNTs/MoSi₂ Composites

Abstract:

Molybdenum disilicide (MoSi₂) matrix composites with various contents of carbon nanotubes (CNTs) were fabricated by sintering in vacuum at 1550 °C for 1 h. The oxidation behaviors of CNTs/MoSi₂ composites at 400 °C and 500 °C for 200 h in air were studied. Results showed that the weight loss of CNTs/MoSi₂ composites increased with the increase of CNTs content. “Pest” phenomenon happened at 400 °C but not at 500 °C. Phase identification and microstructure of the samples were analyzed by X-ray diffraction (XRD) and scanning electron microscopy (SEM). It was found that many MoO₃ whiskers and microcracks only occurred on the surface of CNTs/MoSi₂ composites when oxidized at 400 °C in air, which leaded to the catastrophic disintegration of CNTs/MoSi₂ composites.

• Periodical: Advanced Materials Research (Volume 983)
• Pages: 116-120
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.983.116
• Online since: June 2014
• Authors: Houan Zhang*, He Jian Wu, Jia Lin, Si Yong Gu, Lei Yu
• Keywords: Carbon Nanotube (CN), Low Temperaturelow Temperature, MoSi₂ Matrix Composite, Oxidation

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