PURPOSE: To prevent the generation of non-condensable gas during operation and permit the operation stabilized for a long period of time by a method wherein a tube, having a strength ratio between oxygen and copper, which is lower than a specified value when the inner surface of the tube before operation is measured utilizing a X-ray microanalyzer, is employed.
CONSTITUTION: A copper tube for a heat pipe is received in a vessel capable of heating, evacuating and conducti.ng reducing gas for example, and evacuation is effected between 5kgf/cm2 from G-1×1O8 Torr with a sufficient time to remove adsorption gas in the tube. Then, reducing process is effected and the pipe is dried in the atmosphere of inert gas. In the tube material, processed in such a manner, the strength ratio between oxygen (O) and copper (Cu) becomes lower than 1.0×10-2 when the inner surface of the tube is measured utilizing a X-ray microanalyzer. According to this method, the generation of non-condensable gas upon operating a heat pipe can be prevented. Accordingly, a performance, stabilized for a long period of time, can be obtained.
SOTANI JIYUNJI
SATO KUNIYOSHI
TANAKA SUEMI
