銅電析皮膜の性質におよぼす超音波照射の影響

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It was estimated that the ultrasonic effects were cavitation effects (jet flow, water hammer pressure by the jet flow and shock wave pressure), and it was demonstrated which of these effects was the most pronounced in the case of copper electrodeposited from cupric-EDTA solution. Generally, the radius at which bubbles collapse is about 1/30 of the initial radius, so jet flow rate was estimated at 120ms-1 and water hammer pressure at 200MPa. However, since bubble collapse was random, many jet flows were offset. The authors estimated the speed of most jet flows at 1∼2ms-1. Shock weve pressure was estimated at 1GPa or more, but since the actual electrode surface and received shock wave pressure locally, or simultaneously at random locations, the authors estimated that shock wave pressure was 1∼2MPa. The effects of ultrasound intensity, frequency, flow and hydrostatic pressure on current density, texture coefficient, hardness, particle size and surface morphology were also examined, and hints on the use of ultrasound in electrodeposition applications were obtained. Current efficiency was influenced mainly by the jet flow effect. The orientation and particle size of the crystals and hardness of film were influenced mainly by the water hammer pressure and shock wave pressure effects. The film became smoother as particles were collected in concavities by jet flows, and particles were compressed by water hammer and shock wave pressures. It was confirmed that the greater fineness of the crystals was due to shock wave pressure. The decrease in pin-holes was due to crystals being crushed or pushed into the pin-hole by water hammer pressure or shock wave pressure.
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銅電析皮膜の性質におよぼす超音波照射の影響

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