NDLI: Building Vertical Walls by Deposition of Molten Metal Droplets

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 conducted to determine conditions under which good metallurgical bonding was achieved in vertical walls composed of multiple layers of droplets that were fabricated by depositing tin droplets layer by layer. Molten tin droplets (0.75 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 on different layers: droplet temperature (varied from 250°C to 325°C) and substrate temperature (varied from 100°C to 190°C). Considering the cooling rate of droplet is much faster than the deposition rate previous deposition layer cooled down too much that impinging droplets could only remelt a thin surface layer after impact. Assuming that remelting between impacting droplets and the previous deposition layer is a one-dimensional Stefan problem with phase change an analytical solution can be found and applied to predict the minimum droplet temperature and substrate temperature required for local remelting. It was experimentally confirmed that good bonding at the interface of two adjacent layers could be achieved when the experimental parameters were such that the model predicted remelting.
Sponsorship	Heat Transfer Division
Starting Page	325
Ending Page	330
Page Count	6
File Format	PDF
ISBN	0791842223
DOI	10.1115/IMECE2005-82006
e-ISBN	0791837696
Volume Number	Heat Transfer, Part B
Conference Proceedings	ASME 2005 International Mechanical Engineering Congress and Exposition
Language	English
Publisher Date	2005-11-05
Publisher Place	Orlando, Florida, USA
Access Restriction	Subscribed
Subject Keyword	Remelting Droplet - based manufacturing Droplet deposition Metals Drops
Content Type	Text
Resource Type	Article

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