| 摘要 |
Composition for producing highly refractive coatings by vacuum vapor deposition comprises a sintered mixture of: (1) lanthanum oxide (La2O3) (10-65 wt.%); and (2) a combination of titanium (Ti) and titanium dioxide (TiO2) with an oxygen:titanium atomic ratio of 1.5-1.8 (35-90 wt.%). Independent claims are included for the following: (i) a process for producing (I) comprises preparing a homogeneous mixture of TiO2, Ti and La2O3, granulating the mixture to a particle size of 1-4 mm and sintering the product under vacuum; (ii) a process for producing an optical coating on a substrate comprises: (a) cleaning and drying the substrate and fixing it on a holder in a vapor deposition unit; (b) evacuating the unit down to 10<-5> mbar, heating the substrate to 280-310 degrees C; (c) admitting oxygen into the unit until the pressure is 1-2 x 10<-4> mbar; (d) melting (I) in a screened-off electron beam vaporizer attached to the unit and heating (I) to its vaporization temperature of 2200-2300 degrees C; and (e) opening the screen to coat the substrate with (I) to a predetermined thickness. |
