Process Parameters Used in Macro/Micro Powder Injection Molding: An Overview

Basir, Al; Sulong, Abu Bakar; Jamadon, Nashrah Hani; Muhamad, Norhamidi; Emeka, Ukwueze Bonaventure

doi:10.1007/s12540-020-00767-w

Cited by 23 publications

(26 citation statements)

References 137 publications

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“…The manner of changes in viscosity in terms of shear rate in Figure 5 shows that for all samples viscosity drops with an increase in the shear rate. This behavior, which is called pseudoplastic manners, is ultimate for manufacturing pieces using the CIM process 17–21 …”

Section: Resultsmentioning

confidence: 99%

“…The important point is the yield stress of the feed, the value of which decreases upon temperature elevation. According to studies, 17–21 in identical binder systems, the yield stress of the feed depends on temperature, grain size, and a volumetric fraction of the powder. For example, Sardarian et al 6,23 .…”

Section: Resultsmentioning

confidence: 99%

“…This behavior, which is called pseudoplastic manners, is ultimate for manufacturing pieces using the CIM process. [17][18][19][20][21] The viscosity of such mixture drops increases in shear rate and easily takes the shape of the mold. The relationship between viscosity and shear rate for pseudoplastic fluids of feeds is defined as the following relation 21 :…”

Section: F I G U R Ementioning

confidence: 99%

“…The important point is the yield stress of the feed, the value of which decreases upon temperature elevation. According to studies, [17][18][19][20][21] in identical binder systems, the yield stress of the feed depends on temperature, grain size, and a volumetric fraction of the powder. For example, Sardarian et al 6,23 in a binder system (91% wax paraffin-6% beeswax-3% oleic acid) similar to the binder system of the present research (94% wax paraffin-4% beeswax-2% oleic acid), using alumina powder with the size of 2 μm, obtained the yield stress of 2-53 Pa.…”

Section: F I G U R Ementioning

confidence: 99%

See 3 more Smart Citations

Investigation of nanosized alumina‐binder feedstock rheology for ceramics injection molding (CIM) and survey spark plasma sintering of output green body to obtain transparent alumina

Kallemasih

Loghman-Estarki

Mansouri

et al. 2022

Int J Applied Ceramic Tech

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The purpose of this work is to optimize the feed containing alumina-binder nanoparticles for ceramics injection molding to create transparent alumina parts.In this research, two Alumina with and without MgO as sintering aid fabricated via the spark plasma sintering method. Feed fluidity, fracture toughness, density, IR, and visible transmission of SPSed bodies of the sintered pieces were measured. Furthermore, a pin on the disc test was used on the disk to examine the alumina friction coefficient. The results of feed rheology showed that the sample prepared at 90 • C had the best conditions as a pseudoplastic fluid for the ceramic injection molding (CIM) method. The results showed that a combination of CIM and spark plasma sintering (SPS) methods cause more visible transmission than conventional SPS of alumina nanopowder. Also, the fracture toughness and hardness of as-obtained transparent alumina were in the range of 3.6 MPa m 0.5 and 20.1 MPa, respectively. The wear rate of the as-obtained transparent sample (4.5 × 10 −7 mm 3 /N m) was proportional to the alumina grain size (1-4 μm).

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: F I G U R Ementioning

confidence: 99%

Section: F I G U R Ementioning

confidence: 99%

See 2 more Smart Citations

Investigation of nanosized alumina‐binder feedstock rheology for ceramics injection molding (CIM) and survey spark plasma sintering of output green body to obtain transparent alumina

Kallemasih

Loghman-Estarki

Mansouri

et al. 2022

Int J Applied Ceramic Tech

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“…[5,6]. PIM can also be used to produce both dense and porous materials in addition to macro and micro sized components depending on the specific requirement of each application [7,8].…”

Section: Introductionmentioning

confidence: 99%

Preparation of feedstock containing water-soluble binder for powder injection moulding of silver

AUMNATE¹,

Nawaukkaratharnant

Chuankrerkkul

2022

J Met Mater Miner

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Feedstock for powder injection moulding of silver was prepared using water-soluble binder composed of polyethylene glycol (PEG) and polyvinyl butyrol (PVB). Silver powders with particle size in range of 1 μm to 20 μm can be mixed with PEG/PVB binder system to form feedstocks having powder loadings of 42 vol% and 45 vol%. PEG can be removed using water leaching method while PVB can be removed by thermal debinding. Specimens retained their shapes during debinding and after debinding. Components fabricated with relatively higher powder loading resulted in higher density with lower porosity. Density of specimens containing powder loading of 42 vol% and 45 vol% and heated at 700℃ is about 43% and 46% of the theoretical value, respectively. Therefore, it can be further developed for porous materials applications.

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Effect of Sintering Temperature on Microstructure and Mechanical Properties of Fe–4Ni–0.8Mo–0.6C Steel Small‐Module Gears Fabricated by Micrometal Injection Molding

Liao

Li³

et al. 2023

steel research int.

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With the vigorous development of miniaturization, a series of microsystem technologies emerge and play an increasingly paramount role. The demand for microcomponents such as microgears, microreactors, micromedical devices, and microfluidic devices is also increasing rapidly. [1][2][3] These microcomponents exhibit great potential for applications in aeronautics, automotive, consumer electronics, chemical, environmental analysis, and medical technology. [4,5] The development of microsystem technology requires components with sizes or features in the micrometer range. Existing manufacturing processes, such as microlaser ablation and lithographic process, are limited in terms of yield and/or materials. In addition, the traditional machining technology has the problem of low production efficiency and silicon etching has the problem of high cost. [6][7][8] Micro-metal injection molding (micro-MIM), rapidly developed from MIM, is a net or near-net manufacturing technology for preparing 3D complex metal parts, which can meet the requirements of microsystem technology. [9] It completely meets the requirement of high-cost performance and becomes the most potential preparation technology for the mass production of microworkpieces. [10] The major processing steps in micro-MIM technology are similar to MIM, which include the preparation of feedstock by mixing a thermoplastic binder with metal powder, injection molding into the required shape, and debinding to remove the binder system and sintering. [11] However, some injection molding requirements for micro-MIM are different from those used for MIM. To facilitate the manufacture of microstructure, the powder particle size must be fine enough. The specific surface area of fine powder is increased, and the binder with low viscosity but sufficient strength is needed to facilitate the microinjection molding and avoid the damage of green parts during demolding. At the same time, because the microinjection molding cavity is micron, it puts forward higher requirements for the

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Process Parameters Used in Macro/Micro Powder Injection Molding: An Overview

Cited by 23 publications

References 137 publications

Investigation of nanosized alumina‐binder feedstock rheology for ceramics injection molding (CIM) and survey spark plasma sintering of output green body to obtain transparent alumina

Investigation of nanosized alumina‐binder feedstock rheology for ceramics injection molding (CIM) and survey spark plasma sintering of output green body to obtain transparent alumina

Preparation of feedstock containing water-soluble binder for powder injection moulding of silver

Effect of Sintering Temperature on Microstructure and Mechanical Properties of Fe–4Ni–0.8Mo–0.6C Steel Small‐Module Gears Fabricated by Micrometal Injection Molding

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