To provide an electrode assembly wherein the leakage of a discharging gas is suppressed, and an electrode comprising a metal sintered body containing a refractory metal and a lead wire comprising the refractory metal are welded to each other with a high mechanical strength.
The electrode assembly (4) has an electrode (1) comprising a metal sintered body, a lead wire (2) joined to a bottom portion (1a) of the electrode (1), and a fillet portion (3) provided in the periphery of the joining portion of the electrode (1) to the lead wire (2) and for joining the electrode (1) to the lead wire (2). The electrode (1) contains refractory tungsten particles (W) dispersed in the base material of the metal sintered body and contains a nickel powder (Ni) having a lower melting point than that of the tungsten particles (W) which adheres intimately to the tungsten particles (W) as the carrying material of the tungsten particles (W). The lead wire (2) is made of the same metal as the tungsten particles (W). The fillet portion (3) has a metal organizing structure wherein tungsten particles (W) comprising the same metal as the tungsten particles (W) of the electrode (1) are dispersed in a base material comprising the same metal as the nickel powder (Ni) contained inside the electrode (1).
HAYASHI YUICHIRO
BABA MASAHIKO
