METHOD OF OBTAINING MULTI-LAYERED COVERING Russian patent published in 2014 - IPC C09D1/02 B32B18/00 

FIELD: chemistry.

SUBSTANCE: method of obtaining a multi-layered covering based on SiO₂-ZrO₂-P₂O₅-Na₂O includes the preparation of a film-forming solution with the following successive application of the said solution on a substrate surface and step-by-step thermal processing. To obtain the covering the film-forming solutions (FFS) are applied. For the first layer applied is FFS, which forms a silicophosphate layer, the first FFS is re-applied. After that, the step-by-step thermal processing is carried out at a temperature of 60°C for 30 minutes after the application of the first and second layer, and after the application of the third layer the thermal processing is carried out at 60°C for 30 minutes, then at 600°C for 1 hour. The components for the first FFS are applied with the following component ratio, wt %: zirconium oxochloride - 5.4; wt % ethyl alcohol - the remaining part. The components for the second FFS are applied with the following component ratio, wt %: tetraethoxysilane - 2.6-4.8; sodium chloride - 3.4-5.6; phosphoric acid - 0.5; 96 wt % ethyl alcohol - the remaining part.

EFFECT: method improvement.

3 cl