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(19)

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2 717 780

(13)

(51)

IPC

C01B33/23(2006-01-01)

C30B29/06(2006-01-01)

C30B29/62(2006-01-01)

(21) (22)

Application

2019133376, 2019-10-22

(24)

Start date

2019-10-22

(22)

Actual filing date

2019-10-22

(45)

Published

2020-03-25

(72)

Inventor

Shishkin Roman AleksandrovichKudyakova Valeriya Sergeevna

(73)

Holder

Federalnoe Gosudarstvennoe Byudzhetnoe Uchrezhdenie Nauki Institut Khimii Tverdogo Tela Uralskogo Otdeleniya Rossijskoj Akademii Nauk

METHOD OF PRODUCING FIBROUS SILICON Russian patent published in 2020 - IPC C01B33/23 C30B29/06 C30B29/62

Abstract RU 2717780 C1

FIELD: technological processes.

SUBSTANCE: invention relates to chemical technology of producing fibrous silicon and can be used in powder metallurgy, lithium-ion current sources, solar energy converters, semiconductor devices such as thermoelectric transducers, strain gauges and switches. Fibrous silicon is obtained by reducing silicon dioxide at high temperature using a fluorine-containing reducing agent, which is aluminum subfluoride formed by reacting aluminum and aluminum trifluoride, taken in weight ratio aluminum : aluminum trifluoride = 13÷40:60÷87, wherein reduction of silicon dioxide taken in amount of 15÷65 wt% of total amount of aluminum and aluminum fluoride, preliminary vacuuming is carried out in an inert gas stream at a feed rate of 0.1÷10.0 cm³/min per 1 cm² surface of the silicon dioxide powder at temperature of 900÷1,100 °C and pressure of 1÷10 Pa at a heating rate of 1÷10 deg/min.

EFFECT: invention enables to obtain high purity silicon microfibers in a single step.

1 cl, 3 dwg, 3 ex

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RU 2 717 780 C1

Authors

Shishkin Roman Aleksandrovich

Kudyakova Valeriya Sergeevna

Dates

2020-03-25—Published

2019-10-22—Filed