Silicon Production via Reaction of Silicon Tetrachloride and Aluminum Subchloride

Abstract

Silicon tetrachloride reduction by aluminum subchloride was studied experimentally. Aluminum subchloride was synthesized in a reaction of metallic aluminum and AlCl3; a burner-like construction of the reactor was used to avoid the direct reaction of aluminum and SiCl4. The reduction was conducted at a pressure of 0.1 MPa and two temperature regimes: 1273 K and 1373 K (1000 °C and 1100 °C). As a result, two types of products were obtained: crystals and fine particles. The crystals formation occurred in the high-temperature zone, whereas the particles were dispersed by argon flow and concentrated mainly in aluminum chloride by-product in the cold part of the reactor. It was shown that silicon yield increased with increasing AlCl concentration. The temperature of the reduction process did not have a significant effect on the ultimate silicon yield. However, the silicon etching reaction rate and fine particles yield increased as temperature increased. X-ray diffraction and scanning electron microscopy analysis showed that the impurities content in silicon crystals was below the detection limit. In contrast, the aluminum content in the powder product was 2 to 3 wt pct. Another type of product, yellow blanket-like silicon fibers, was obtained with a high yield at 1373 K (1100 °C) and low [AlCl]:[SiCl4] ratio.

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Correspondence to Roman A. Zakirov.

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Manuscript submitted November 14, 2018.

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Zakirov, R.A., Parfenov, O.G. Silicon Production via Reaction of Silicon Tetrachloride and Aluminum Subchloride. Metall Mater Trans B 50, 2197–2204 (2019). https://doi.org/10.1007/s11663-019-01653-6

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