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Two-dimensional simulation of mass transport in polymer removal from a powder injection molding compact by thermal debinding

Published online by Cambridge University Press:  31 January 2011

Ying Shengjie ,
Y. C. Lam ,
S. C. M. Yu  and
K. C. Tam
Ying Shengjie
Affiliation:
School of Mechanical and Production Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798
Y. C. Lam
Affiliation:
School of Mechanical and Production Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798
S. C. M. Yu
Affiliation:
School of Mechanical and Production Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798
K. C. Tam
Affiliation:
School of Mechanical and Production Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798
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Abstract

Two-dimensional simulation of thermal debinding in powder injection molding based on mass and heat transfer in deformable porous media is proposed. The primary mechanisms of mass transport, i.e., liquid flow, gas flow, vapor diffusion, and convection, as well as the pyrolysis of polymers, and their interactions, are included in the model. The simulated results revealed that polymer removal process is primarily affected by liquid flow, which is mainly dominated by pressure-forced flow rather than capillary-driven flow. A significant phenomenon, enrichment with liquid polymer in the outer surface regions of the compact, is explained.

Type
Articles
Information
Journal of Materials Research , Volume 16 , Issue 8 , August 2001 , pp. 2436 - 2451
Copyright
Copyright © Materials Research Society 2001

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