Effect of polypropylene as the backbone of MIM feedstock on the micro-structural phase constituents, mechanical and rheological properties of 4605 low alloy steel compacts

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

doi:10.1080/00325899.2019.1701812

Cited by 10 publications

(5 citation statements)

References 30 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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“…In contrast to PIM, where the feedstock is often supplied as granules [ 14 ], feedstock in the form of filament is required. FFF equipment installation expenses are significantly less than those for PIM equipment [ 15 ].…”

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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“…The 65 vol% of powder loading was selected finally. Momeni et al [18] also studied the effect of polypropylene (PP) as a second component on the properties of 4605 low-alloy steel compacts. A wax-based binder system was used and different contents of PP (20, 24, 28 mass %) were added.…”

Section: Introductionmentioning

confidence: 99%

Effect of Polyvinylpyrrolidone Content on Pure Titanium Injection Molding

Zhang,

Li,

et al. 2023

Crystals

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In water-soluble binder systems, polyethylene glycol (PEG) and polymethylmethacrylate (PMMA) are often used as primary and secondary components. The PEG/PMMA binder system is clean and environmentally friendly, but the discrepancy between the crystallization temperature of PEG and the glass transition temperature of PMMA leads to the generation of pores in the feedstock. The solidification pores have an adverse impact on the final mechanical properties of the samples. Polyvinylpyrrolidone (PVP), as a crystallization inhibitor, can inhibit the formation of porosity. In this study, spherical titanium powder with a diameter of less than 45 μm was used as metal powder; the binder system consisted of PEG, PMMA and SA. Different increments of PVP (0, 10%, 20%, 30 wt.%) were added to the PEG/PMMA binder system. The uniformity of the feedstock and the open channels generated after debinding were observed using SEM. The pores’ condition before and after debinding was studied using Micro CT, and the mechanical properties of the samples were also detected. By comparing the macroscopic and microscopic morphologies of the injected samples and mechanical properties of the sintered samples, it was found that a PVP content of 20 wt.% resulted in the best properties.

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Effect of polypropylene as the backbone of MIM feedstock on the micro-structural phase constituents, mechanical and rheological properties of 4605 low alloy steel compacts

Cited by 10 publications

References 30 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

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

Effect of Polyvinylpyrrolidone Content on Pure Titanium Injection Molding

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