In MIM, fine metal powders are mixed with a binder and injected into molds, similar to plastic injection molding. After molding, the binder is removed from the part, and the compact is sintered to almost full density. The obstacle to sinter bonding a MIM part to a conventional (solid) substrate lies in the sinter shrinkage of the MIM part, which can be up to 20%, meaning that the MIM part shrinks during sintering, while the conventional substrate maintains its dimensions. This behavior would typically inhibit bonding and/or cause cracking and deformation of the MIM part. A structure of micro features molded onto the surface of the MIM part allows for shrinkage while bonding to the substrate. The micro features tolerate certain plastic deformation to permit the shrinkage without causing cracks after the initial bonds are established. In a first series of tests, bond strengths of up to 80% of that of resistance welds have been achieved. This paper describes how the authors developed their proposed method of sinter bonding and how they accomplished effective sinter bonds between MIM parts and solid substrates.
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ASME 2011 International Manufacturing Science and Engineering Conference
June 13–17, 2011
Corvallis, Oregon, USA
Conference Sponsors:
- Manufacturing Engineering Division
ISBN:
978-0-7918-4430-4
PROCEEDINGS PAPER
Micro Feature Enhanced Sinter Bonding of Metal Injection Molded (MIM) Parts to Solid Substrate Available to Purchase
Thomas Martens,
Thomas Martens
Clemson University, Greenville, SC
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Laine Mears
Laine Mears
Clemson University, Greenville, SC
Search for other works by this author on:
Thomas Martens
Clemson University, Greenville, SC
Laine Mears
Clemson University, Greenville, SC
Paper No:
MSEC2011-50129, pp. 17-24; 8 pages
Published Online:
September 14, 2011
Citation
Martens, T, & Mears, L. "Micro Feature Enhanced Sinter Bonding of Metal Injection Molded (MIM) Parts to Solid Substrate." Proceedings of the ASME 2011 International Manufacturing Science and Engineering Conference. ASME 2011 International Manufacturing Science and Engineering Conference, Volume 1. Corvallis, Oregon, USA. June 13–17, 2011. pp. 17-24. ASME. https://doi.org/10.1115/MSEC2011-50129
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