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Metals 2018, 8(9), 698; https://doi.org/10.3390/met8090698

Effect of CaCl2 on Microstructure of Calciothermic Reduction Products of Ti2O3 to Prepare Porous Titanium

1,2,3
,
1,2,3,4,* , 1,2,3
,
1,2,3
,
1,2,3,4
and
1,2,3
1
National Engineering Laboratory for Vacuum Metallurgy, Kunming University of Science and Technology, Kunming 650093, China
2
State Key Laboratory of Complex Nonferrous Metal Resources Clear Utilization, Kunming University of Science and Technology, Kunming 650093, China
3
Faculty of Metallurgy and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China
4
Yunnan Provincial Key Laboratory for Nonferrous Vacuum Metallurgy, Kunming University of Science and Technology, Kunming 650093, China
*
Author to whom correspondence should be addressed.
Received: 13 August 2018 / Revised: 3 September 2018 / Accepted: 3 September 2018 / Published: 5 September 2018
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Abstract

The compound CaCl2 plays a significant role in the process of direct calciothermic reduction of Ti2O3 to prepare porous titanium. In this paper, the effect of CaCl2 on reduction products by calciothermic reduction of Ti2O3 was investigated. Results show that the distribution of CaCl2 in reduction preform influences particle size and morphology differences in reduction products both on the surface and the inside. The CaCl2 is transferred to the surface of the Ti2O3 preform due to its volatilization before and throughout reduction. The content of CaCl2 in the surface zone of Ti2O3 preform is significantly higher than that in the interior during the reduction process, contributing to the formation of large Ti particles with a smooth shape on the surface, and small Ti particles with inherited morphology of Ti2O3 inside. More CaCl2 causes the aggregation of Ti particles to form large Ti particles which are advantageous as they connect and form a more solid porous titanium structure. The presence of a small amount of CaCl2 in the interior also results in the coexistence of small Ti and CaO particles, forming a loose structure with uniform distribution. View Full-Text
Keywords: CaCl2; calciothermic reduction; Ti2O3; microstructure; morphology; Ti particles CaCl2; calciothermic reduction; Ti2O3; microstructure; morphology; Ti particles
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Yang, G.; Xu, B.; Wan, H.; Wang, F.; Yang, B.; Wang, Z. Effect of CaCl2 on Microstructure of Calciothermic Reduction Products of Ti2O3 to Prepare Porous Titanium. Metals 2018, 8, 698.

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