Patent ID: 7819303

Claim:
A method for airtightly joining a hollow tube made of a reinforced platinum with a flange made of non-reinforced platinum or a non-reinforced platinum alloy, which is a method for airtightly joining the outer periphery of a hollow tube made of a reinforced platinum produced by dispersing metal oxides in platinum or a platinum alloy, with a flange made of non-reinforced platinum or a non-reinforced platinum alloy, the method comprising shrink-fitting a ring made of non-reinforced platinum or a non-reinforced platinum alloy to the outer periphery of the hollow tube of reinforced platinum; heating the hollow tube to which the ring is shrink-fit at from 1,150 to 1,450° C. for from 1 to 10 hours; welding the flange made of non-reinforced platinum or a non-reinforced platinum alloy to the outer periphery of the ring.