AQUEOUS SLURRY FOR THE PRODUCTION OF THERMAL AND ENVIRONMENTAL BARRIER COATINGS AND PROCESSES FOR MAKING AND APPLYING THE SAME Russian patent published in 2017 - IPC C23C26/00 C23C24/08 

FIELD: chemistry.

SUBSTANCE: invention relates to an improved composition of a suspension which may be used to provide improved thermal barrier coating as well as the porous protective heat-barrier from exposure to ambient coating, a process for preparing mentioned aqueous slurry and method for applying this suspension to the substrate. The composition of the aqueous suspension for the production of a porous thermo-barrier environmental protection coating comprises a first powder of an oxide material with a thermal conductivity below 5 W/(m⋅K), consisting of coarse particles having an average particle size of 5 μm to 60 μm, at least a portion of which has a closed porosity and which are heat-resistant and impermeable to gas and liquid, a second powder of an oxide material with a thermal conductivity below 5 W/(m⋅K), consisting of fine particles having an average particle size of 0.1 μm to 5 μm, wherein the average particle size of the second powder is at least 5 times smaller than the average particle size of the first powder, the elementary boron particle in an amount of 0.2 Up to 2.0% by weight, an aqueous inorganic binder suspending at least a portion of mentioned elementary boron particles, coarse particles and fine particles in the aqueous solution, the large particles with closed porosity that are heat resistant provide the coating with a non-destructive closed porous structure.

EFFECT: protective coating having thermal barrier properties and barrier properties against external conditions suitable for high temperature applications.

25 cl, 9 dwg, 1 tbl