Supercritical carbon dioxide debinding in metal injection molding (MIM) process

Yong Ho Kim, Youn Woo Lee, Jong Ku Park, Chang Ha Lee, Jong Sung Lim

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6 Citations (Scopus)

Abstract

The conventional debinding process in metal injection molding (MIM) is critical, environmentally unfriendly and time consuming. On the other hand, supercritical debinding is thought to be an effective method appropriate for eliminating the aforementioned inconvenience in the prior art. In this paper, supercritical debinding is compared with the conventional wicking debinding process. The binder removal rates in supercritical C02 have been measured at 333.15 K, 348.15 K, and 358.15 K in the pressure range from 20 MPa to 28 MPa. After sintering, the surface of the silver bodies were observed by using SEM. When the supercritical C02 debinding was carried out at 348.15 K, all the paraffin wax (71 wt% of binder mixture) was removed in 2 hours under 28 MPa and in 2.5 hours under 25 MPa. We also studied the cosolvent effects on the binder removal rate in the supercritical CO 2 debinding. It was found that the addition of non-polar cosolvent (;;-hexane) dramatically improves the binder removal rate (more than 2 times) for the paraffin wax-based binder system.

Original languageEnglish
Pages (from-to)986-991
Number of pages6
JournalKorean Journal of Chemical Engineering
Volume19
Issue number6
DOIs
Publication statusPublished - 2002 Nov

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All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)

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