Low volatility slurry for emission mix powder

A mercury vapor discharge lamp comprising a light-transmissive glass envelope, an electrode disposed within said glass envelope to provide a discharge, a phosphor layer coated adjacent an inner surface of said envelope, a fill gas of mercury and an inert gas sealed inside said envelope, and a rare earth oxide layer substantially uniformly disposed over a surface of said electrode, said oxide layer being formed from an emission mix slurry, said slurry comprising 20-50 wt. % suspension medium and 50-80 wt. % carbonate powder as suspended solids, said suspension medium being selected from the group consisting of (a) organic materials having a vapor pressure of less than 0.1 mm Hg at 20° C., and (b) water, said electrode having a secondary coiling, said secondary coiling having a secondary length, said oxide layer being coated on said secondary coiling and having a coating weight of 0.2-0.6 mg/mm along said secondary length, said coating weight being substantially uniform over said secondary coiling along said secondary length.

An emission mix slurry for coating onto a fluorescent lamp electrode, said slurry comprising 20-50 wt. % suspension medium and 50-80 wt. % carbonate powder as suspended solids, said suspension medium being selected from the group consisting of organic materials having a vapor pressure of less than 0.1 mm Hg at 20° C.

An emission mix slurry for coating onto a fluorescent lamp electrode, said slurry comprising 20-50 wt. % suspension medium and 50-80 wt. % carbonate powder as suspended solids, said suspension medium being deionized water.

An emission mix slurry for coating onto a fluorescent lamp electrode, said slurry comprising 20-50 wt. % suspension medium and 50-80 wt. % carbonate powder as suspended solids, said suspension medium being selected from the group consisting of (a) organic materials having a vapor pressure of less than 0.1 mm Hg at 20° C., and (b) water, said carbonate powder comprising a mixture of calcium carbonate, barium carbonate and strontium carbonate, the ratio of calcium carbonate:barium carbonate:strontium carbonate in said carbonate powder being about 50:40:10 or about 50:30:20 by weight.

An emission mix slurry for coating onto a fluorescent lamp electrode, said slurry comprising 20-50 wt. % suspension medium and 50-80 wt. % carbonate powder as suspended solids, said suspension medium being selected from the group consisting of (a) organic materials having a vapor pressure of less than 0.1 mm Hg at 20° C., and (b) water, said carbonate powder comprising barium carbonate, strontium carbonate, calcium carbonate and zirconium carbonate, the ratio of barium carbonate:strontium carbonate:calcium carbonate:zirconium carbonate being 59:22.3:15.1:3.6 by weight.

A mercury vapor discharge lamp comprising a light-transmissive glass envelope, an electrode disposed within said glass envelope to provide a discharge, a phosphor layer coated adjacent an inner surface of said envelope, a fill gas of mercury and an inert gas sealed inside said envelope, and a rare earth oxide layer substantially uniformly disposed over a surface of said electrode, said oxide layer being formed from an emission mix slurry, said slurry comprising 20-50 wt. % suspension medium, and greater than 50 wt. % and not more than 80 wt. % carbonate powder as suspended solids, said suspension medium being selected from the group consisting of (a) organic materials having a vapor pressure of less than 0.1 mm Hg at 20° C., and (b) water.