NDLI: Experiments on Remelting and Solidification of Molten Metal Droplets Deposited in Vertical Columns

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Fang, M. Chandra, S. Park, C. B.
Copyright Year	2005
Abstract	Experiments were done to determine conditions under which vertical columns could be built by metal droplets landing sequentially on top of each other. Molten tin droplets (0.6 mm diameter) were deposited using a pneumatic droplet generator on an aluminum substrate. The primary parameters varied in experiments were those found to most affect bonding between droplets: droplet temperature (250°C to 345°C), substrate temperature (60°C to 200°C) and deposition rate (1 Hz to 15 Hz). At lower deposition rates the substrate cooled down too much to induce remelting whereas at higher rates the tip of the column remained liquid and surface tension forces pulled it into a spherical mass. Assuming one-dimensional conductive heat transfer in a column a simple analytical model was developed to calculate the temperature at the tips of the column. It predicts that deposition frequency should be decreased as column height increases to hold the tip temperature constant. Droplet coalescence was best achieved when the tip temperature of a column was maintained at the melting point of the metal. Columns fabricated following the deposition frequency predicted by the model show good bonding between droplets and uniform diameter.
Sponsorship	Heat Transfer Division and Electronic and Photonic Packaging Division
Starting Page	461
Ending Page	466
Page Count	6
File Format	PDF
ISBN	0791847322
DOI	10.1115/HT2005-72421
e-ISBN	0791837629
Volume Number	Heat Transfer: Volume 2
Conference Proceedings	ASME 2005 Summer Heat Transfer Conference collocated with the ASME 2005 Pacific Rim Technical Conference and Exhibition on Integration and Packaging of MEMS, NEMS, and Electronic Systems
Language	English
Publisher Date	2005-07-17
Publisher Place	San Francisco, California, USA
Access Restriction	Subscribed
Subject Keyword	Remelting Droplet–based manufacturing Droplet deposition Metals Drops Solidification
Content Type	Text
Resource Type	Article

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