Paper Title:
Fabrication of Lotus-Type Porous Metals by Continuous Zone Melting and Continuous Casting Techniques
  Abstract

Lotus-type porous metals with low thermal conductivity are fabricated by continuous zone melting technique, which possess directional elongated pores. The porous metals have been able to be fabricated through the conventional casting method by utilizing the solubility gap between solid and liquid in pressurized gas atmosphere. However, there is a shortcoming that the pores are coarsened in the part farther from the chill plate in the ingot. In order to overcome such a shortcoming, we developed the continuous zone melting technique and successfully produced the lotus-type porous metals with even low thermal conductivity such as stainless steel and superalloys. Furthermore, from the viewpoint of mass production with low cost, we invented novel ”continuous casting technique”. The molten metals dissolving gas are solidified continuously by passing through the mold cooled with chiller and thus, lotus-type porous metal plate as long as one meter was produced for short time. Sufficient uniformity of the porosity and pore size was obtained in such long porous ingots. This technique is prospective method for commercial mass production.

  Info
Periodical
Materials Science Forum (Volumes 539-543)
Main Theme
Edited by
T. Chandra, K. Tsuzaki, M. Militzer , C. Ravindran
Pages
187-192
DOI
10.4028/www.scientific.net/MSF.539-543.187
Citation
H. Nakajima, S. K. Hyun, J.S. Park, M. Tane, "Fabrication of Lotus-Type Porous Metals by Continuous Zone Melting and Continuous Casting Techniques", Materials Science Forum, Vols. 539-543, pp. 187-192, 2007
Online since
March 2007
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