High pressure arc discharge lamp having barium hafnate impregnat

Details High pressure arc discharge lamp having barium hafnate impregnat High pressure arc discharge lamp having barium hafnate impregnat

1995-05-05

1996-08-27

Horabik, Michael

Electric lamp and discharge devices

With gas or vapor

Having electrode of alkali, alkaline or rare earth material

313633, 313346R, 313491, 313311, 252521, 445 51, H01J 1704, H01J 61073

Patent

active

055504310

ABSTRACT:
An electron emitting, barium hafnate material for arc discharge lamp electrodes is manufactured by the method comprising the steps of: forming a mixture of barium carbonate and hafnium oxide in a 48 to 52 mole ratio; adding the mixture to a suitable carrier to form a slurry; ball milling the slurry for about 2 hours to form a powder mix; drying the powder mix; firing the dried powder mix in air at about 1500.degree. C. for about 22 hours to produce a product; and vibration milling the product in methanol with zirconia media to produce the barium hafnate. The latter material is then preferably vacuum impregnated into a tungsten electrode and hydrogen fired to produce a single phase barium oxide/hafnium oxide compound.

REFERENCES:
patent: 2843801 (1958-07-01), Krefft
patent: 3886391 (1975-05-01), Koury et al.
patent: 4044276 (1977-08-01), Keeffe et al.
patent: 5111108 (1992-05-01), Goodman et al.
patent: 5138224 (1992-08-01), Goldburt et al.

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