GLASS CERAMIC COATING BASED ON ORGANO-YTTRIUM OXANE ALUMOXANE SILOXANES AND METHOD OF OBTAINING THEREOF Russian patent published in 2014 - IPC C04B41/87 

FIELD: chemistry.

SUBSTANCE: invention relates to a method of obtaining protective high-temperature anti-oxidation coatings with a composition Y₂O₃-Al₂O₃-SiO₂ on carbide-silicon fibres. A glass ceramic coating is based on organo-yttrium oxane alumoxane siloxanes of general formula: [(R**O)_sY(OH)_tO_r]_k·[Al(OR)₁(OR*)_x(OH)_zO_y]_m·[SiR***₂O]_g, where k, m, g=3-12; s+t+2r=3; 1+x+2y+z=3; R - C_nH_2n+1, n=2-4; R* - C(CH₃)=CHC(O)C_nH_2n+1, C(CH₃)=CHC(O)OC_nH_2n+1; R** - C(CH₃)=CHC(O)CH₃,R*** - OC₂H₅, CH₃, CH₂=CH, and a solvent with the following ratio of components, wt %: organo-yttrium oxane alumoxane siloxane 2-4; solvent - the remaining part to 100. Each layer of the polymer coating is subjected to drying in air and wet atmospheres at room temperature for 1.5-3 hours. After that fibres with the hardened coatings are thermally processed in air medium at a temperature of 1500°C with 30-180 min exposure. The thickness of the coating varies from 0.4 to 2 mcm depending on the number of layers, applied on the carbide-silicon fibres.

EFFECT: reduction of the coating viscosity

2 cl, 2 tbl, 1 dwg