METHOD OF PRODUCING PROTECTIVE COATING ON ARTICLES WITH SILICON CARBIDE, SILICON NITRIDE AND CARBON-CONTAINING BASE Russian patent published in 2014 - IPC C04B41/87 C04B35/528 

FIELD: chemistry.

SUBSTANCE: method of producing a protective coating on articles with a silicon carbide, silicon nitride and carbon-containing base involves forming, on the surface of an article, a slurry coating from a mixture of fine carbon and silicon nitride powder with binder, heating the article in silicon vapour in a closed reactor volume to temperature of 1700-1800°C, holding in said temperature interval for 1-2 hours and then cooling in silicon vapour. Before heating to temperature of 1700-1800°C, the silicon nitride particles are encapsulated in a more heat-resistant material and/or silicon. Encapsulation is carried out, for example, by preheating silicon nitride powder in silicon vapour to 1500°C or in a fluidised bed in a medium of a carbon-containing gas at temperature of partial carbidisation and formation of a pyrocarbon coating on Si₃N₄ particles, and by treating the slurry coating in a carbon-containing medium at temperature of partial carbidisation of silicon nitride.

EFFECT: high thermal shock resistance of the coating.

8 cl, 1 ex, 1 tbl