Abstract
The authors made an automatic temperature cycle repeater (ATCR), which could repeat the successive heating and cooling procedure of a metal Berthelot tube over the appropriate temperature range (temperature cycle) required for the generation of negative pressure. By operating the ATCR, they observed trends in negative pressure for water contained in a stainless steel tube, which enabled them to study the effect of the degassing pretreatment of the sealing material. Using a plug made from Ni degassed at 500 degrees C for 30 h under a vacuum of 10-6 Torr, the negative pressure was raised to -125 bar at 47 degrees C after a total of 3800 temperature cycles, which is the highest level ever reported for water in a metal tube; it is notable because it was raised for about a gram of water in contact with rough metal surfaces. The result supports the working assumption that the generation of a high negative pressure in a metal tube is limited by the supply of gas from sources in the bulk to crevices on the surface. The generally accepted gas-trapping crevice model should be supplemented with this working assumption.
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