Influence of the Morphology and Particle Size on the Processing of Bronze 90/10 Powders by Metal Injection Moulding (MIM)

José M. Contreras; Antonia  Jiménez-Morales; José Manuel Torralba

doi:10.4028/www.scientific.net/MSF.534-536.365

Paper Titles

Effect of Particle Size in Feedstock Properties in Micro Powder Injection Molding
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Effect of Residual Carbon on the Microstructure Evolution during the Sintering of M2 HSS Parts Shaping by Metal Injection Moulding Process
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Fabrication of Ti-6Al-7Nb Alloys by Metal Injection Molding
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Gas Nitriding Mechanism in Titanium Powder Injection Molded Products
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Influence of the Morphology and Particle Size on the Processing of Bronze 90/10 Powders by Metal Injection Moulding (MIM)
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Innovations in Micro Metal Injection Molding Process by Lost Form Technology
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Metal and Ceramic Micro Components Made by Powder Injection Molding
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Metal Injection Molding Process of Mo₂FeB₂ Boride Base Cermets
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Micro Metal Injection Molding Using Hybrid Micro/Nano Powders
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Influence of the Morphology and Particle Size on the Processing of Bronze 90/10 Powders by Metal Injection Moulding (MIM)

Abstract:

The MIM technology is an alternative process for fabricating near net shape components that usually uses gas atomised powders with small size (< 20 μm) and spherical shape. In this work, the possibility of changing partially or totally spherical powder by an irregular and/or coarse one that is cheaper than the former was investigated. Different bronze 90/10 components were fabricated by mixing three different types of powder: gas atomised spherical powder (usual MIM powder < 22 μm) and two water atomised irregular powders (size < 35 μm and < 140 μm). The blends were made by using only two types of powder in each mixture with the following volume proportions (100/0, 67/33, 33/67, 0/100). The influence of the particle size and shape on the powder packing density and sintering stage was analyzed through the apparent density of the powder blends, as well as, densification, hardness and porosity of the sintered parts. The addition of irregular and/or coarse powder was found to affect the moulding process, although good densifications and hardnesses were obtained in the sintering step. Therefore it could be a promising way to diminish production costs in this technology.