Investigating the Effect of Stearic Acid on the Mechanical, Rheological, and Microstructural Properties of AISI 4605 Feedstock for Metal Injection Molding Process

Momeni, Vahid; Askari, Ali; Allaei, Mohammad Hossein; Zangi, Hadi

doi:10.1007/s12666-021-02282-x

Cited by 15 publications

(5 citation statements)

References 27 publications

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“…It could be inferred that both types of failure have occurred. This discrepancy is related to the microstructure difference [44,45]. Due to a change in the carbon content of the samples, in some cases, the brittle iron carbide phase (Fe3C) has developed mainly at the grain boundary, reducing elongation and altering the failure process (change the microstructure from hypo eutectoid to hypereutectoid).…”

Section: Resultsmentioning

confidence: 99%

Metal Injection Molding of Low Alloy Steel by Using a Palm Stearin/HDPE Binder System

Momeni

2022

KEM

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Metal injection molding (MIM) is a proven technology for fabricating complex geometry and low-cost components. The binder system formulation and powder loading are the key parameters affecting the final properties of the manufactured parts in this process. This study investigates the influence of palm stearin (PS) content in a PS/High-Density Polyethylene (HDPE) binder system for three powder loadings of 60, 65, and 70 Vol.%. The manufactured feedstocks are characterized using scanning electron micrograph (SEM), thermo gravimetric analysis (TGA), and differential scanning calorimeter (DSC), rheological and mechanical tests. The results show that PS enhances mechanical properties at increased powder loading. In addition, residual carbon following changing the PS percentages has a significant role in determining the final characteristics of parts. Findings demonstrated that PS could drastically alter the rheological behavior, a crucial criterion for optimizing the feedstock formulation in the MIM process.

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Section: Resultsmentioning

confidence: 99%

Metal Injection Molding of Low Alloy Steel by Using a Palm Stearin/HDPE Binder System

Momeni

2022

KEM

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“…Ali et al 17 found that adding 0.2vol% stearic acid (SA) or oleic acid in the wax-based binder system is enough to produce the effect of the surface modifier and significantly improve the fluidity of the feedstock. Momeni et al 18 found that in the process of 4605 low-alloy steel powder injection molding, with the continuous increase of surfactant SA, the feedstock showed higher sensitivity to the shear rate. When the amount of SA was 9 vol%, the mechanical properties of the feedstock reached the best.…”

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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“…Binders are multi-component combinations of several polymers and additives that play a significant role in the SDS processing of components [ 3 ]. It has been shown that just one component modification in the binder system may significantly alter feedstock characteristics [ 4 , 5 ]. After the preparation of the feedstock, green parts with the desired shape are produced by injection molding or 3D printing [ 6 ].…”

Section: Introductionmentioning

confidence: 99%

Effects of Different Polypropylene (PP)-Backbones in Aluminium Feedstock for Fused Filament Fabrication (FFF)

et al. 2023

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The current study presents the effect of the backbone as an important binder component on the mechanical, rheological, and thermal properties of Aluminium (Al) alloy feedstocks. A thermoplastic elastomer (TPE) main binder component was blended with either polypropylene (PP), grafted-maleic anhydride-PP (PPMA), or grafted-maleic anhydride-PPwax (PPMAwax) plus PP, as the backbone. Differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) tests were performed to investigate the thermal properties of binder systems and feedstocks. Fourier-transform infrared (FTIR) spectroscopy was used to study the chemical interaction between the binder and the Al alloy. After making feedstock filaments, tensile tests, scanning electron microscopy (SEM), and fused filament fabrication (FFF) printing were done. The results showed that although the PP printability was acceptable, the best mechanical properties and printed quality can be achieved by PPMA. TGA test showed that all binder systems in the feedstocks could be removed completely around 500 °C. From FTIR, the possibility of chemical reactions between Al alloy particles and maleic anhydride groups on the grafted PP backbone could explain the better dispersion of the mixture and higher mechanical properties. Tensile strength in PP samples was 3.4 MPa which was improved 1.8 times using PPMA as the backbone.

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Investigating the Effect of Stearic Acid on the Mechanical, Rheological, and Microstructural Properties of AISI 4605 Feedstock for Metal Injection Molding Process

Cited by 15 publications

References 27 publications

Metal Injection Molding of Low Alloy Steel by Using a Palm Stearin/HDPE Binder System

Metal Injection Molding of Low Alloy Steel by Using a Palm Stearin/HDPE Binder System

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

Effects of Different Polypropylene (PP)-Backbones in Aluminium Feedstock for Fused Filament Fabrication (FFF)

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