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Co-Sintering of Titanium/Stainless Steel Bi-Material Parts Produced by 2C-MIM

  • : Mulser, M1
  • : 1Fraunhofer IFAM Bremen
  • : PDF Download
  • : 2012

Abstract

Two-component metal injection moulding (2C-MIM) allows producing functionally graded metal parts. The quality of the interface after co-sintering is the crucial factor for intact parts after processing. The material combination of titanium with stainless steel reveals challenges due to limitations in the sintering temperature. In this study, pure titanium and Ti-6Al-4V MIM parts were joined to the stainless steels 316L and 17-4PH during sintering. The interface was characterized by optical microscopy and EDX line scans. Although the stainless steels were not sintered to sufficient density, the results show bonding of the samples after co-sintering. A diffusion layer was noticed that shows diffusion of the alloying elements from the steel into the titanium. It is expected that the mismatch in sintering shrinkage can be further balanced by adjusting the sintering temperature and the particle size of the powders.
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