METHOD FOR PURIFICATION OF SILICIUM CARBIDE Russian patent published in 1996 - IPC

Abstract RU 2060935 C1

FIELD: production of super pure material. SUBSTANCE: powder of silicium carbide is fed into fluoroplastic reactor and poured by mixture of 7.5-12.5 M nitric acid and hydrofluoric acid, volume ratio of said acids being 1: (3-5) respectively. Then heating and boiling within 2.5-3 h followed by washing with distilled water and by annealing are carried out. Said annealing takes place on open air within 1.5-2 h at 1.5-2 h. Desired material contains 0.3 •10^-4-10^-3 % of SiO₂, and not more 0,05•10^-4 % of free silicium and carbon. EFFECT: improves efficiency of method. 1 tbl

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RU 2 060 935 C1

Authors

Isakov V.P.

Judina K.S.

Filippov Ju.A.

Dates

1996-05-27—Published

1992-02-25—Filed