2001 (and backfills for previous years) / DB reference years
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Author Orme-M; Courter-J; Liu-Q; Zhu-J; Smith-R; Dept. of Mech. and Aerospace Eng. University of California, Irvine CA 92697-3975, United States
Source Materials-Research-Society-Symposium-Proceedings. v 624 2000, p 17-22; Materials Development for Direct Write Technologies. San Francisco, CA, United States Conf dates: 20000424-20000426; Materials-Research-Society-Symposium-Proceedings
Abstract The formation of highly uniform charged molten metal droplets from capillary stream break-up has recently attracted significant industrial and academic interest for applications requiring high-speed and high-precision deposition of molten metal droplets such as direct write technologies. Exploitation of the high droplet production rates intrinsic to the phenomenon of capillary stream break-up and the unparalleled uniformity of droplet sizes and speeds attained with proper applied forcing to the capillary stream make many new applications related to the manufacture of electronic packages, circuit board printing and rapid prototyping of structural components feasible. Recent research results have increased the stream stability with novel acoustic excitation methods and enable ultra-precise charged droplet deflection. Unlike other modes of droplet generation such as Drop-on-Demand, droplets can be generated at rates typically on the order of 10,000 to 20,000 droplets per second (depending on droplet diameter and stream speed) and can be electrostatically charged and deflected onto a substrate with a measured accuracy of plus or minus 12.5 mum. Droplets are charged on a drop-to-drop basis, enabling the direct writing of fine details at high speed. New results are presented in which fine detailed patterns are "printed" with individual molten metal solder balls, and issues relevant to the attainment of high quality printed artifacts are investigated. 11 Refs. (Auth abstract) XX