Low temperature powder injection molding of iron micro-nano powder mixture

You, Woo-Kyung; Choi, Jin Nam; Yoon, Su-Min; Lee, Jai-Sung

doi:10.1016/j.powtec.2012.05.016

Cited by 55 publications

(38 citation statements)

References 25 publications

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“…In order to obtain a dense tungsten body, a conventional MIM process for net-shaped tungsten-based composites demands a multicomponent binder system for liquid binder mixing and sintering temperatures over 2000°C [13][14][15][16][17][18][19]. A multi-component binder system is commonly used to maintain the shape of a molded part while each binder component is gradually eliminated during the debinding process by their various molecular weights.…”

Section: Introductionmentioning

confidence: 99%

“…A multi-component binder system is commonly used to maintain the shape of a molded part while each binder component is gradually eliminated during the debinding process by their various molecular weights. Various multi-component binder systems have been reported for the MIM process [13][14][15][16][17][18]. As previously mentioned, common liquid binder mixing has to be performed at temperatures over 100°C.…”

Section: Introductionmentioning

confidence: 99%

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Fabrication of tungsten-based composites by solid binder mixing and sintering

Suh

Shin

2015

Powder Technology

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Fabrication of tungsten-based composites by solid binder mixing and sintering

Suh

Shin

2015

Powder Technology

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“…However, as component size is gradually decreasing, micro-powder can no longer satisfy the requirements of dimensional accuracy or surface roughness [8,9]. Thus, investigations of MIM, HIP and sintering processes with nano-powder have been actively performed [10][11][12][13]. However, if only nano-powder is used, the particle size is very small, and the surface area is large.…”

Section: Introductionmentioning

confidence: 99%

“…Recent investigations have reported that the enhancement of MIM characteristics and the use of a bimodal-type powder mixture, including a micro-nano-powder, are closely related in Cu, Fe and W systems [10][11][12][13]. If MIM products are prepared from mixtures of micro-and nano-powders, molding properties can be improved due to the solid binder effect of the nano-particles; the sintered density will increase due to a nano-powder effect located among the micro-powders, and the grain growth will also be suppressed [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

“…If MIM products are prepared from mixtures of micro-and nano-powders, molding properties can be improved due to the solid binder effect of the nano-particles; the sintered density will increase due to a nano-powder effect located among the micro-powders, and the grain growth will also be suppressed [10][11][12]. Surface roughness, an important characteristic of MIM products, can also be improved, and ideally, isostatic shrinkage will be realized [11,13].…”

Section: Introductionmentioning

confidence: 99%

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Control of the Nano-Particle Weight Ratio in Stainless Steel Micro and Nano Powders by Radio Frequency Plasma Treatment

Yang

Kim

Hur

et al. 2015

Metals

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This study describes how to make stainless steel hybrid micro-nano-powders (a mixture of micro-powder and nano-powder) using an in situ one-step process via radio frequency (RF) thermal plasma treatment. Nano-particles attached to micro-powders were successfully prepared by RF thermal plasma treatment of stainless steel powder with an average size of 35 μm. The ratio of nano-powders is estimated with a two-dimensional fluid simulation that calculates the temperature profile influencing the rate of surface evaporation. The simulation is conducted to determine the variation of the input power and the distance from the plasma torch to the feeding nozzle. It was demonstrated experimentally that the nano-powder ratio in the micro-nano-powder mixture can be controlled by adjusting the feeding rate, plasma power, feeding position and quenching effect during plasma treatment. The ratio of nano-particles in the micro-nano-powder mixture was controlled in a range from 0.1 (wt. %) to 30.7 (wt. %).

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Direct Fabrication of Metallic Microgear via Electrohydrodynamic Inkjet 3D Printing

2020

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Microgear is used to transmit power and motion. It is one of the key elements in various microdevices which have been successfully implanted with a wide range of application areas such as microfluidic, medical equipment, and biotechnology. A variety of techniques have been developed to realize both light‐weight and high‐strength microgear manufacturing. However, those techniques often contain hazard substances with many complex procedures. Extreme conditions such as ultrahigh temperature and pressure are also often required. Herein, a direct fabrication of a metallic microgear using electrohydrodynamic inkjet 3D printing with silver nanoparticles (Ag‐NPs) is demonstrated. Both printing resolution and microgear surface morphology are enhanced by controlling printing parameters such as dot diameter and pitch. The microgear with excellent surface finish can be obtained. Its teeth face has an average surface roughness (Ra) of 200 nm after optimization of the printing condition. After the printing process, a post‐thermal curing process with different curing temperatures is conducted to improve its mechanical properties. Finally, the printed microgear has a hardness of 210 MPa and yield stress over 200 MPa due to Ag‐NP aggregation during thermal curing.

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Low temperature powder injection molding of iron micro-nano powder mixture

Cited by 55 publications

References 25 publications

Fabrication of tungsten-based composites by solid binder mixing and sintering

Fabrication of tungsten-based composites by solid binder mixing and sintering

Control of the Nano-Particle Weight Ratio in Stainless Steel Micro and Nano Powders by Radio Frequency Plasma Treatment

Direct Fabrication of Metallic Microgear via Electrohydrodynamic Inkjet 3D Printing

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