Preparation of high-purity TiSi<sub>2</sub> and eutectic Si-Ti alloys by vacuum electromagnetic directional solidification

Zhang Yakun; Lei Yun; Ma Wenhui

doi:10.7513/j.issn.1004-7638.2023.06.008

Volume 44 Issue 6

Dec. 2023

Turn off MathJax

Article Contents

Article Navigation > IRON STEEL VANADIUM TITANIUM > 2023 > 44(6): 58-63

Zhang Yakun, Lei Yun, Ma Wenhui. Preparation of high-purity TiSi2 and eutectic Si-Ti alloys by vacuum electromagnetic directional solidification[J]. IRON STEEL VANADIUM TITANIUM, 2023, 44(6): 58-63. doi: 10.7513/j.issn.1004-7638.2023.06.008

Citation:

Zhang Yakun, Lei Yun, Ma Wenhui. Preparation of high-purity TiSi₂ and eutectic Si-Ti alloys by vacuum electromagnetic directional solidification[J]. IRON STEEL VANADIUM TITANIUM, 2023, 44(6): 58-63. doi: 10.7513/j.issn.1004-7638.2023.06.008

Citation:

PDF( 1949 KB)

Preparation of high-purity TiSi₂ and eutectic Si-Ti alloys by vacuum electromagnetic directional solidification

doi: 10.7513/j.issn.1004-7638.2023.06.008

Zhang Yakun^1
,,
Lei Yun^{1, 2},
Ma Wenhui^{1, 2, 3
,
,}

1.
National Engineering Research Center of Vacuum Metallurgy, Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, Yunnan, China
2.
State Key Laboratory of Complex Nonferrous Metal Resources Clear Utilization, Kunming University of Science and Technology, Kunming 650093, Yunnan, China
3.
Pu’er University, Pu’er 665000,Yunnan, China

Received Date: 2023-08-04
Available Online: 2024-01-11
Publish Date: 2023-12-30

Abstract

Abstract

To prepare the high-purity TiSi₂ and eutectic Si-Ti alloys, the vacuum electromagnetic directional solidification technique was used to separate and purify Ti-Si alloys in this study. The results show that the vacuum electromagnetic directional solidification can effectively purify the Ti-Si alloys. Fe, Al, and Mn impurities were removed through their segregation effect at the solid-liquid interface (enriched at the top). Ca and Mg impurities were removed by vacuum volatilization due to the vapor pressure being significantly higher than that of Si and Ti. After vacuum electromagnetically directed solidification of the Ti-56% Si alloy (purity 96%), the dense TiSi₂ alloy was separated in the lower part of the crucible, and the eutectic Si-Ti alloy with a homogeneous phase was separated in the upper part. The purity of the TiSi₂ thus prepared was 99.4%, and that of the eutectic Si-Ti alloy was 99.1% (only considering the main impurities Fe, Mn, Ca, Mg, and Al).
- TiSi₂,
- eutectic Si-Ti alloys,
- vacuum refining,
- electromagnetic directional solidification,
- separation and purification

FullText(HTML)

References(16)

References

[1]	Melsheimer S, Fietzek M, Kolarik V, et al. Oxidation of the intermetallics MoSi₂ and TiSi₂—A comparison[J]. Oxidation of Metals, 1997,47:139−203. doi: 10.1007/BF01682375
[2]	Frommeyer G, Rosenkranz R. Structures and properties of the refractory silicides Ti₅Si₃ and TiSi₂ and Ti-Si-(Al) eutectic alloys[J]. Metallic Materials with High Structural Efficiency, 2004,146:287−308.
[3]	Ting C Y, Heurle F M, Iyer S S, et al. High temperature process limitation on TiSi₂[J]. Journal of the Electrochemical Society, 1986,133(12):2621−2625. doi: 10.1149/1.2108491
[4]	Milanese C, Buscaglia V, Maglia F, et al. Reactive growth of niobium silicides in bulk diffusion couples[J]. Acta Mater, 2013,51:4837−4846.
[5]	Wen Q, Zhong Z, Yang A, et al. Effect of adding of SiC particulate on the microstructure and shear strength of SiC ceramic joint brazed with Si-24Ti alloy[J]. Journal of Adhesion Science & Technology, 2018: 1−13.
[6]	Zhou S, Liu X, Wang D. Si/TiSi₂ heteronanostructures as high-capacity anode material for Li ion batteries[J]. Nano Letter, 2010,10(3):860−863. doi: 10.1021/nl903345f
[7]	Trambukis J, Munir Z A. Effect of particle dispersion on the mechanism of combustion synthesis of titanium silicide[J]. Journal of the American Ceramic Society, 2010, 73: 1240−1245.
[8]	Agarwal S, Cotts E J, Zarembo S, et al. The heat capacities of titanium silicides Ti₅Si₃, TiSi and TiSi₂[J]. Journal of Alloys and Compounds, 2001,314(1-2):100−102.
[9]	Lee Y, Lee S. Phase formation during mechanical alloying in the Ti–Si system[J], Materials Science and Engineering: A, 2007, 449: 1099–1101.
[10]	Fouad O A, Yamazato M, Hiroshi A, et al. Formation of titanium silicide thin films on Si (100) substrate by RF plasma CVD[J]. Surface and Coatings Technology, 2003,169:632−635.
[11]	Yu W, Xue Y, Mei J, et al. Segregation and removal of transition metal impurities during the directional solidification refining of silicon with Al-Si solvent[J]. Journal of Alloys and Compounds, 2019,805:198−204. doi: 10.1016/j.jallcom.2019.07.089
[12]	Ma X D, Yoshikawa T, Morita K. Si growth by directional solidification of Si-Sn alloys to produce solar-grade Si[J]. Journal of Crystal Growth, 2013,377:192−196. doi: 10.1016/j.jcrysgro.2013.05.024
[13]	Koyama T, Ike D M, Shibuta Y. Silicon crystal pulling from the melt of Si-45mass%Ni alloy[J]. ISIJ International, 2008,94:496−501.
[14]	Massalski T B. Binary alloy phase diagrams[M]. Ohio: 2nd edition, ASM International, Metals Park, 1990.
[15]	张亚坤. 工业废料再生制备Ti₅Si₃、TiSi₂和低铁Al-Si合金的研究[D]. 昆明: 昆明理工大学. 2023. Zhang Yakun. Study on the preparation of Ti₅Si₃, TiSi₂, and low-Fe Al-Si alloys by regeneration of industrial wastes [D]. Kunning: Kunming University of Science and Technology. 2023.
[16]	Kubaschewski O, Alcock C B. Metallurgical thermochemistry [M]. Oxford: Pergamon Press, 1979.