Preparation of TiC Nano-particles and Transformation of TiO2 via Microwave Carbothermic Reduction Rout

doi:10.15541/jim20160642

Abstract

Abstract:

TiC powders were prepared via microwave carbothermic reduction in Ar with TiO₂ and nano-carbon black as starting materials. Effects of TiO₂ particle sizes, temperature and holding time on phase compositions, particle morphologies and TiC yields in the reaction products were investigated by means of X-ray diffraction (XRD) and scanning electron microscopy (SEM). Avrami equation was fitted to the change of TiO₂ conversion with time at different temperatures. Results show that TiO₂ powders with average diameters ranging from 40 to 400 nm were fully reduced at 1300-1400℃ for 30-40 min with TiC yield as high as 98.2%. TiC powder with uniform particle size less than 100 nm was obtained in case of reaction at 1400℃ for 30 min by using 40 nm TiO₂ as starting material. Transformation curves of TiO₂ were prepared for the synthesis of nano-TiC by microwave carbothermic reduction.

Key words: nano-TiC, microwave synthesis, phase analysis, diffusion mechanism

CLC Number:

TQ174

YUAN Zhen-Xia, LU You-Jun, CHEN Wei-Ye, WU Lan-Er. Preparation of TiC Nano-particles and Transformation of TiO₂ via Microwave Carbothermic Reduction Rout[J]. Journal of Inorganic Materials, 2017, 32(9): 991-996.

Figures/Tables 7

Fig. 1 XRD patterns of the products synthesized at different temperatures for 30 min by using 40 nm TiO2 powders

Fig. 2 XRD patterns of products synthesized at 1300℃ using 40 nm (a) and 400 nm (b) TiO2 powders as raw material

Fig. 3 XRD patterns of products synthesized at 1300℃ for 40 min using TiO2 powders with different particle sizes as raw material

Fig. 4 EDS spectrum of the synthesized TiC grain

Fig. 5 SEM images of TiC powder prepared under different conditions (a) 40 nm TiO2, 1400℃-30 min; (b) 400 nm TiO2, 1400℃-30 min; (c) 40 nm TiO2, 1300℃-40 min; (d) 400 nm TiO2, 1300℃-40 min

Fig. 6 Fitting curves of Avrami equation at different temperature and the Temperature-Time-Conversion graph using 40 nm (a) and 400 nm (b) TiO2 powders as raw material

Table 1 Diffusion coefficient of the reaction system at different temperature using 40 nm TiO2 and 400 nm TiO2 powders as raw material

d₅₀/nm	Temperature/℃	D	Standard error
40	1200	0.02063	0.00255
	1300	0.07091	0.00353
	1400	0.15901	0.01508
400	1200	0.01677	0.00288
	1300	0.05615	0.00221
	1400	0.11888	0.00899

References 35

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Preparation of TiC Nano-particles and Transformation of TiO₂ via Microwave Carbothermic Reduction Rout

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