1996 Fiscal Year Final Research Report Summary
Study on Cavity Filling, Debinding and Sintering Processes in Metal Injection Molding
| Project/Area Number |
07455286
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Material processing/treatments
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| Research Institution | Nagoya University |
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Principal Investigator |
NOMURA Hiroyuki Nagoya University, School of Engineering, Department of Materials Processing Engineering, Professor, 工学部, 教授 (60023272)
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| Co-Investigator(Kenkyū-buntansha) |
TAKITA Mitsuharu Nagoya University, School of Engineering, Department of Materials Processing Eng, 工学部, 講師 (20163355)
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| Project Period (FY) |
1995 – 1996
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| Keywords | Metal Injection Molding / Metal powder / Debinding / Sintering / Rheology / Net Shape Processing |
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| Research Abstract |
The study has been carried out on cavity filling, debinding and sintering processes in metal injection molding. In particular, theological behavior of metal powder sllurry and debinding characteristics are discussed and the results are obtained as follows :
Rheology of metal powder slurry Viscosity of slurry including SUS304 powder and organic binder is measured in the broad range of temperature and metal powder content. Viscosity is shown to depend on shear rate in slurry and slurry temperature. It is expressed as : eta=6.63gamma^<0.8921n(0.817Vf)>exp(3.57*10^3/T).
Debinding of injected material From the series of debinding experiments, binder elimination velocity is shown to be nearly equal between the injected green body and the binder melt. Namely binder gas diffusion is responsible for the debinding rate-determining process. Using one-dimensional diffusion equation, the diffusion constant of binder gas is estimated to be D=1.4*10^<-4>exp (-1800/T). In order to obtain desired debound compacts, 95-97% of binder content should be removed in the debinding process. Fundamental idea will be obtained on controlling diffusion of binder gas in order to optimize debinding process.
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