Vacuum Synthesis of Nanocrystalline TiC at a Low Carbothermal Reduction Temperature

D.P. Xiang; C. Li; C.J. Liu; L. Ding

doi:10.4028/www.scientific.net/AMR.774-776.881

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 774-776Vacuum Synthesis of Nanocrystalline TiC at a Low...

Vacuum Synthesis of Nanocrystalline TiC at a Low Carbothermal Reduction Temperature

Abstract:

Ultrafine TiC powders with a grain size of about 25 nm were synthesized from nanoanatase TiO₂/carbon black mixtures by mechanical activation-assisted vacuum carbothermal reduction (MCR) reaction. The effects of mechanical activation and carbon sources on TiO₂ carbothermal reduction (CR) were also investigated. Results indicated that the CR of nanoTiO₂ was enhanced after pre-milling of the starting powders. The synthesis temperature and holding time of TiC decreased from 1500 °C to 1300 °C and from 4 h to 2 h, respectively. However, phase evolution analysis of the reaction showed that mechanical activation did not alter the phase evolution sequences of the TiO₂ CR. In addition, the relative weight loss of powders in increasing temperatures indicated that nanoTiO₂ MCR can be divided into three stages, in which the reaction rate of the second stage is found to be the fastest. The study on the effect of different carbon sources on the MCR of nanoTiO₂ showed that the use of nanocarbon black as carbon source can cause MCR to react more thoroughly than the use of graphite and active carbon.

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Advanced Materials Research (Volumes 774-776)

Pages:

881-886

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.774-776.881

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Online since:

September 2013

Authors:

D.P. Xiang, C. Li, C.J. Liu, L. Ding

Keywords:

Carbothermal Reduction (CR), Mechanical Activation, Nanocrystalline TiC, Phase Evolution, Ultrafine Powders

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