TUNGSTEN MATERIAL AND TUNGSTEN ELECTRODE MATERIAL FOR DISCHARGE LAMP

摘要

PROBLEM TO BE SOLVED: To provide a tungsten electrode material inexpensively capable of suppressing blackening phenomenon which influences the service life of a discharge lamp.;SOLUTION: In this electrode material, each element of Mg, Ca, Ba, Ti, Zr, Hf, V, Nb and Ta of 2a, 4a and 5a groups of the periodic table is 0.5 ppm or less, and the rest is tungsten except for the elements and other impurities.;COPYRIGHT: (C)2007,JPO&INPIT