Binder System for Coarse Powders Processed by Metal Injection Molding (MIM)

A.P.G. Nogueira; Ricardo Machado; Paulo A.P. Wendhausen; Diego Fernando Portaluppi

doi:10.4028/www.scientific.net/MSF.591-593.169

Paper Titles

Structural Evaluation of Mechanically Alloyed Ti-Nb Powders
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Structural Evaluation of Ti-22.2Si-11.1B Powders Milled with PCA Addition
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The Influence of the Milling Media Environment on the Characteristics of a W-Cu Composite Powder
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Mechanical Activation of Nb75Al Powder Mixtures with Different Process Control Agents
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Binder System for Coarse Powders Processed by Metal Injection Molding (MIM)
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Viscosity Measuring Methods for Feedstocks Directly on Injection Molding Machines
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The Study of Prototypes of Dental Implants Obtained by the Titanium Powder Injection Molding Process: In Vivo Study
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Structure and Properties of Aluminum Matrix Composites Reinforced by Al₂O₃ Particles
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Fabrication of U₃Si₂ Powder for Fuels Used in IEA-R1 Nuclear Research Reactor
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Binder System for Coarse Powders Processed by Metal Injection Molding (MIM)

Abstract:

Research on determined alloys produced by metal injection molding has been done for cost reduction purposes through the use of powders with bigger particle size. However, regarding feedstock homogeneity, certain limitations are presented when coarse particles are used. For instance, homogeneity strongly influences rheological behavior of the feedstock and dimensional control of the sintered part. Therefore, the purpose of this work was to evaluate effectiveness of a modified binder system with the addition of a surfactant polymer which makes the feedstock more homogeneous. This study was carried out on a FeNiP alloy currently processed by MIM, where 50%wt of the iron powder was replaced with course powder having a particle size distribution of D90 less than 47 ,m. Effectiveness of binder systems using a Melt Flow Index (MFI) and the behavior of dimensional accuracy at sintered part were analyzed. Results showed more feedstock homogeneity and less dimensional deviation when a surfactant agent was used.