Water based processing of iron powder utilising starch consolidation

Romano, Patricia Silvia; Lyckfeldt, Ola; Khraisat, Walid

doi:10.1179/003258905x37576

Cited by 5 publications

(3 citation statements)

References 4 publications

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“…In powder metallurgy, there is a method to form a porous material using starch as the carrying fluid and the consolidator. It is the method to consolidate iron powder using starch 19) . Water-based processing for metal powder using organic additives was critical regarding the oxygen/carbon content and the consequences for the sintering performance and ultimate material properties.…”

Section: Introductionmentioning

confidence: 99%

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Fabrication of a Lotus-type Porous Material to be Applied in Heat Pipe Wick

Supriadi¹,

Putra²,

Ariantara³

et al. 2021

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There are high demands on a state of the art technology in the field of heat pipes, especially in capillary pumping performance. Previous studies concluded that a biomaterial had a superior performance as a material for the capillary wick. However, it was followed by consequences of harnessing the ecosystem. A new material that mimics a lotus stem and exceeds the performance of a coral will be a necessity. It is projected that Lotus-Type Porous Material (LTP) can outperform a coral performance as wick material. The lotus-type porous material was fabricated with a slip casting process using a starch binder and copper powder. A nylon wire was employed as the aligned pore former. To remove moisture after the slip casting process, we used a freeze-drying technique. Densification and consolidation of copper powder were carried out with the sintering process. The performance of the lotus-type porous material was characterized in order to get a capillary pumping coefficient. We analyzed the pore using an SEM and X-ray 3D Scan. The result showed that an excellent capillary pumping performance could be achieved using the lotus-type porous material. We also confirmed these phenomena using an SEM and xray 3D scan analysis. It is concluded that lotus-type porous material performs excellent fluid transport capability.

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Section: Introductionmentioning

confidence: 99%

“…They had difficulties in removing the trapped air during the mold filling because of the viscosity of the starch solution. A fabrication of High-Speed Steel with high hardness and bending strength could be achieved using starch as a binder 19) . Starch used as a binder material could be employed in a Metal Injection Molding process 20) .…”

Section: Introductionmentioning

confidence: 99%

Fabrication of a Lotus-type Porous Material to be Applied in Heat Pipe Wick

Supriadi¹,

Putra²,

Ariantara³

et al. 2021

Evergreen

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“…[18][19][20] To obtain a high shaped density, it is important to reach as high solids loading as possible, but in the meantime, too high viscosity would obstruct the mold filling or air removal at shaping. The suitable solids loading has to be defined for each specific powder by rheological measurements, which are not included in this article but can be found elsewhere.…”

Section: Introductionmentioning

confidence: 99%

Starch Consolidation as a New Process for Manufacturing Powder Metallurgy High-Speed Steels

Romano

Velasco

Torralba

2007

Metall Mater Trans A

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The development of a new method called ''starch consolidation,'' suitable for the production of powder metallurgy (P/M) high-speed steel (HSS) components has been studied. Samples have been consolidated using 1.5, 3.5, and 5 vol pct starch and up to 60 vol pct powder. The high solid loading was achieved by stabilizing the repulsive forces with a small addition (0.01 wt pct) of a dispersant (polyacrylic acid) that resulted in accurate fluidity and consolidation of the prepared slurries. After shaping of the samples, the bending strength of the green bodies was evaluated. Debinding cycles were optimized by comparing carbon and oxygen content in argon, in N 2 -5H 2 , and in pure hydrogen. The three atmospheres showed no significant differences in carbon elimination. To determine the influence of H 2 in a nitrogen-rich atmosphere during sintering, tests were performed at 1230°C in a N 2 -5H 2 and in a nitrogen atmosphere. Pure nitrogen resulted in a microstructure formed by smaller carbides. Heat treatments were performed on the samples with the compositions that gave the best combination of properties. A hardness of 800 HV and a bending strength of 1475 MPa were obtained.

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