Effects on trends in negative pressure of surface pre-treatments for the sealing plugs of a water-metal Berthelot tube system
作者： Y Ohde , K Hiro , M Ono , H Isono , H Watanabe
DOI: 10.1088/0022-3727/25/7/010
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摘要: Trends in negative pressure over a few thousand cavitation events have been investigated for Berthelot system comprising water/stainless steel/tube/sealing Ni plug order to study the effects and extents of surface pre-treatments sealing metal, polishing, etching, electroplating. The polishing etching separated two kinds nuclei on metal surface; gases trapped within pores (crevices) (i) surface, (ii) extending deep into bulk. latter, although much tougher, influenced at most. rise after total 1800 temperature cycles levelled off around -115 bar (-11.5 MPa) irrespective finishes plugs. Electroplated plugs gave poor increasing trends owing co-deposited hydrogen. Impurity did limit pressure. These results, together with those reported before, validated authors extended gas-trapping crevice model, is eventually limited by supply gas from sources bulk crevices.
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