METHOD OF APPLYING PROTECTIVE COATING ONTO QUARTZ CRUCIBLE INNER SURFACE Russian patent published in 2017 - IPC C30B15/10 C30B33/02 F27B14/10 C23C16/40 C23C16/455 C30B29/08 

FIELD: metallurgy.

SUBSTANCE: by applying a protective coating on the inner surface of the quartz crucible, GeO₂ is used formed by passing through a closed cold crucible of gaseous GeO, heated to 850-1,000°C, then the crucible is opened and heated under air to 850-1,000°C, then the crucible is held at the same temperature in an air atmosphere to obtain a dense coating.

EFFECT: invention allows to obtain a uniform coating of germanium dioxide in the inner surface of quartz crucible with thickness to 100-150 microns using a technologically simple method not requiring significant energy expenditure.

1 dwg, 1 ex