Effect of 17-4PH stainless steel powders interaction on feedstocks

Ma, Haihong; Li, Shuo; Jin, Zhesheng; Tian, Yiwen; Ren, Fengmei; Zhou, Zhengfa; Xu, Weibing

doi:10.1016/j.powtec.2020.05.106

Cited by 4 publications

(4 citation statements)

References 31 publications

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“…Therefore, CTHP-m and ETHP-m was more tightly packed through reaction so that some binder between powders released as shown in figure 7, and the close combination of powders reduced the contact area between the powder and the binder [36], thereby reducing the flow friction of powders in binder, and the flowability of feedstock increased. In our previous study [37], the interaction between powders improved the fluidity of the feedstock. However, the silicon element in the surface treatment agent may not be conducive to the sintering process of the products.…”

Section: Feedstock Propertiesmentioning

confidence: 84%

Effect of interaction from the reaction of carboxyl/epoxy hyperbranched polyesters on properties of feedstocks for metal injection molding

Chen

Zhou

et al. 2022

Mater. Res. Express

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The purpose of this study is to improve the properties of the feedstocks and shape retention of debinded parts by the reaction between 17-4PH stainless steel powders. Carboxyl-terminated hyperbranched polyester (CTHP) and epoxy-terminated hyperbranched polyester (ETHP) were used to treat the powders, and termed as CTHP-m and ETHP-m with carboxyl and epoxy group, respectively. Comparing with pristine, CTHP-m and ETHP-m, feedstock prepared from equal amount of CTHP-m and ETHP-m (CTHP-m/ETHP-m) possessed more excellent properties. The experimental results showed that the critical solids loading, flexural modulus, density and melt flow index of CTHP-m/ETHP-m feedstock were 63.8 vol.%, 2800 Mpa, 5.06 g/cm3 and 62 g/10min, respectively, which were obviously higher than that of others. Also, the shape retention of CTHP-m/ETHP-m debinded parts was the best of all the samples. The improved properties of CTHP-m/ETHP-m feedstock were attributed to the powder interaction between CTHP-m and ETHP-m formed by the chemical reaction between epoxy and carboxyl group.

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Section: Feedstock Propertiesmentioning

confidence: 84%

Effect of interaction from the reaction of carboxyl/epoxy hyperbranched polyesters on properties of feedstocks for metal injection molding

Chen

Zhou

et al. 2022

Mater. Res. Express

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“…This stable/unstable transition defines the CSL which appears at 51% for the F1 composite and 47% for F2. The optimum volume fraction can be chosen as the CSL, but as with Ma et al [41], a value of 1 vol.% below the CSL is chosen in this work to ensure safe homogeneous mixing.…”

Section: Determination Of the Csl With Continuously Increasing Powder...mentioning

confidence: 99%

Highly loaded magnetocaloric composites by La(Fe,Si)13H powder dedicated to extrusion-based additive manufacturing applications

et al. 2023

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“…With the increase of the volume fraction of smaller powder particles and the relative regularization of particle shape, the critical powder loading capacity increases. Ma et al 14 mixed the feedstock of the 17-4PH powder modified by 3-Aminopropyltriethoxysilane(KH550) and 3-Glycidoxypropyltrimethoxysilane(KH560) and wax-based binder, respectively. The results show that the interaction between powders can improve the green density, and shape retention of the part after thermal debinding.…”

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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Effect of 17-4PH stainless steel powders interaction on feedstocks

Cited by 4 publications

References 31 publications

Effect of interaction from the reaction of carboxyl/epoxy hyperbranched polyesters on properties of feedstocks for metal injection molding

Effect of interaction from the reaction of carboxyl/epoxy hyperbranched polyesters on properties of feedstocks for metal injection molding

Highly loaded magnetocaloric composites by La(Fe,Si)13H powder dedicated to extrusion-based additive manufacturing applications

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

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