Method of producing a reflection layer for high-pressure discharge lamps.

摘要

Reflective coating is produced on the ends of a high pressure discharge lamp vessel using a suspension comprising (by wt.) 0.5-5% highly dispersed pyrogenic silica alumina mixt., 0-5% acetic acid, 0-1% boric acid, 24-55% water and balance zirconia. The mixt. pref. contains 0-30 (16) wt.% alumina. Pref. the suspension comprises 1.5% silica alumina mixt., 1.4% acetic acid, 0.2% boric acid, 59.4% zirconia and 37.5% water. The coating is pref. produced by pre-heating the discharge vessel to 250 deg.C, spraying the suspension onto the ends of the vessel and sintering the coating by successive heating to 1000 deg.C, e.g. for 120s.