Rheological Characterization of Powder Mixture Including a Space Holder and Its Application to Metal Injection Molding

Park, Sang June; Kim, Dongyeong; Lin, Dongguo; Park, Seong Jin; Ahn, Seokyoung

doi:10.3390/met7040120

Cited by 9 publications

(7 citation statements)

References 14 publications

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“…This material is commonly used in the chemical industries and marine industries [3][4][5]. In order to decrease the cost for post-processing, 316L SS has been produced by many advanced net shape fabrication technologies, including selective laser melting (SLM) [6], and metal injection molding (MIM) [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

“…Metal injection molding of 316L SS is an attractive net shape fabrication method due to its capability of mass production of parts with complex shapes [7][8][9], which has been extensively investigated by many researchers. The effect of debinding temperatures on the microstructure and mechanical properties of 316L SS was investigated by Amin et al [10].…”

Section: Introductionmentioning

confidence: 99%

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On the Microstructures and Fatigue Behaviors of 316L Stainless Steel Metal Injection Molded with Gas- and Water-Atomized Powders

Zhang

Feng

et al. 2018

Metals

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316L stainless steel samples are fabricated by metal injection molding using water-atomized and gas-atomized powder with different oxygen contents. The influences of oxygen on the microstructural evolution and fatigue properties of the samples are investigated. The oxygen tends to react with Mn and Si to form oxide particles during sintering. The oxides hamper the densification process and result in decreased sintered density. Moreover, their existence reduces the Mn and Si dissolving into the base metal and compromises the solution strengthening effect. The oxides lead to stress concentration in the tensile and fatigue tests and become the initiation sites of fatigue cracks. After sintering, the samples made from the gas-atomized powder have a much lower oxygen content compared to those made from the water-atomized powder, therefore, exhibiting much better mechanical properties. The tensile strength, yield strength and the elongation of the samples made from the gas-atomized powder are 560 MPa, 205 MPa, and 58%, respectively. Their fatigue lives are about one order of magnitude longer than the samples made from water-atomized powder, and also longer than those fabricated by powder metallurgy and selective laser sintering which were reported in other studies.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

On the Microstructures and Fatigue Behaviors of 316L Stainless Steel Metal Injection Molded with Gas- and Water-Atomized Powders

Zhang

Feng

et al. 2018

Metals

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“…The difference between the CPVC value of the 316L in this study and related studies, using similar PSD, which reported values close to 66% [7,14,17,19], can be attributed to the use of different binder type or processing conditions (mixing temperature or speed). The influence of these differences is seen in a related study in which a CPVC of 61% was reported for a 316L stainless-steel powder [20].…”

Section: Optimization Process: Effects Of Powder Typementioning

confidence: 91%

Feedstocks of Aluminum and 316L Stainless Steel Powders for Micro Hot Embossing

Emadinia

Vieira

2018

Metals

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In metal powder, shaping the preparation and characterization of the feedstock is an aspect commonly recognized as fundamental. An optimized composition is required to ensure the successful shaping of the feedstock. In this study, a commercial binder system, pure aluminum and 316L austenitic stainless-steel powders were used for micro hot embossing. The optimization process revealed that powder characteristics such as shape and the stability of the torque mixing, were important parameters. Manipulating the feedstock composition by adding multi-walled carbon nanotubes or stearic acid or using a higher powder concentration considerably influenced the torque mixing values. The steady state of torque mixing was achieved for all feedstocks. This torque behavior indicates a homogeneous feedstock, which was also confirmed by microscopic observations. Nevertheless, an extruding process was required for greater homogeneity of the aluminum feedstocks. The presence of the carbon nanotubes increased the homogeneity of green parts and reduced microcrack formation. The roughness was essentially dependent on the feedstock composition and on the plastic deformation of the elastomer die. Shaping the prepared feedstocks (with or without carbon nanotube) was achieved by the optimized powder concentrations and it did not increase by the stearic acid addition.

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“…3 The parts have high precision, excellent mechanical properties, large-scale, fast and efficient production, and it has been applied in many fields. 4,5,6 A key problem in MIM is how to improve the shape retention or dimensional stability of the final product. This is the result of comprehensive factors, which are significantly affected not only by critical powder loading, feedstock uniformity, and rheological properties but also by the interface bonding strength between powder and binder and the mechanical strength of green parts.…”

Section: Introductionmentioning

confidence: 99%

Effect of surface modification of metal powders (by aluminum stearate) on the properties of metal injection molding feedstock

Ma,

Fang,

Zhou

et al. 2024

Powder Metallurgy

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Metal injection molding (MIM) is a net-forming technology for manufacturing miniature metal parts, which can improve the manufacturing accuracy of complex-shaped parts. In this study, aluminum stearate was used to modify the 17-4PH stainless steel powder, the binder was composed of (PMMA) and (PEG) with the volume ratio of 7:3. The effects of aluminum stearate surfactant amount on the feedstock viscosity, water debinding rate and thermal debinding shape were studied. The results showed that the coating of aluminum stearate breaks the agglomeration between the powders and decreases the viscosity of the feedstock. When the addition of aluminum stearate was 0.6wt% of the powder mass, the melt index, density and flexural modulus of the feedstock were 81.5 g/10 min, 5.44 g/cm3, and 1643Mpa, respectively, and the thermal debinding shape retention was the best of all debinded parts. However, too much aluminum stearate makes the feedstocks thicker and the green part weaker.

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Rheological Characterization of Powder Mixture Including a Space Holder and Its Application to Metal Injection Molding

Cited by 9 publications

References 14 publications

On the Microstructures and Fatigue Behaviors of 316L Stainless Steel Metal Injection Molded with Gas- and Water-Atomized Powders

On the Microstructures and Fatigue Behaviors of 316L Stainless Steel Metal Injection Molded with Gas- and Water-Atomized Powders

Feedstocks of Aluminum and 316L Stainless Steel Powders for Micro Hot Embossing

Effect of surface modification of metal powders (by aluminum stearate) on the properties of metal injection molding feedstock

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