GLASS-CERAMIC COATING FOR VANADIUM AND ITS ALLOYS Russian patent published in 1997 - IPC

FIELD: ceramics. SUBSTANCE: coating has the following components, wt. -%: glass frit 60-90; filling agent 10-40; Filling agent: at least one oxide of the group: ZrO₂, V₂O₃, Al₂O₃, and glass frit has the following components, wt. -%: silicon oxide SiO₂, 30-50; barium oxide BaO, 20-35; calcium oxide CaO, 3-10; aluminium oxide Al₂O₃, 2-5; boron oxide B₂O₃, 3-7.5; titanium oxide TiO₂, 1-6; sodium oxide Na₂O, 2-8; zirconium oxide ZrO₂, 0.5-3; yttrium oxide V₂O₃, 0.5-3. Coating properties: cohesion strength with backing is above 200 kg/cm²; CTR is (9.0-9.7) x 10^-6 1/degree; microhardness is 790 ± 10 kg/mm²; thermostability at 600-20 C is above 400 cycles; roasting range is 1080-1200 C. EFFECT: improved quality and properties of coating. 4 tbl