FIELD: metallurgy.
SUBSTANCE: protective coat is applied on quartz crucible inner surface by its processing with the mix of gases H2, CO and H2O at their ratio of 2:28:18 at 1150-1200°C for 1 hour. Thereafter, said crucible is subjected to heat treatment at 1150-1200°C for an hours unless hard surface results.
EFFECT: invention allows production of 150-200 mcm deep silicon dioxide coats, homogeneous surface without growth flaws, better manufacturability, simple equipment, low energy costs.
1 dwg, 2 ex
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