Development of a feedstock formulation based on polypropylene for micro-powder soft embossing process of 316L stainless steel micro-channel part

Sahli, Mohamed; Gelin, Jean‐Claude

doi:10.1007/s00170-013-5170-z

Cited by 14 publications

(18 citation statements)

References 11 publications

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“…The DSC curve measured during heating an endothermic peak of fusion at 164°C with an enthalpy of fusion of was . The temperature and enthalpy of fusion suggest a 35% crystalline polypropylene (PP) when compared to the enthalpy of fusion of 100% crystalline PP (198 J/g) [46], [47]. Curves similar to the one for PP were also found by TGA analyses [46], with a huge mass loss from 350 to 500 °C with 12% residual mass in form of a powder containing the inorganic filler material.…”

Section: Surface Layer Analysis a Metallic Surfacesmentioning

confidence: 84%

Quantitative and representative adherence assessment of coated and uncoated concrete-formwork

Spitz

Coniglio

Mansori

et al. 2018

Surface and Coatings Technology

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Section: Surface Layer Analysis a Metallic Surfacesmentioning

confidence: 84%

Quantitative and representative adherence assessment of coated and uncoated concrete-formwork

Spitz

Coniglio

Mansori

et al. 2018

Surface and Coatings Technology

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“…Two component binder systems were used to prepare the powder-binder feedstock consisting of low density polyethylene (PE 520) and ethylenebistearamide (WC). The theoretical mixture density is a linear function of the volume fraction of solids and could be represented by the following relationships [15], [17][18]:…”

Section: Materials and Experimental Proceduresmentioning

confidence: 99%

“…The aim of this study is to investigate the influence of process variables on the debinding of injection molded pieces by melt wicking; where thermal wicking (capillary flow) is used to remove the binder. Carbonyl iron steel, Nickel aluminide, and 316L stainless powders are used in this study, which are known for their good mechanical properties, corrosion resistance, and behavior suitable for a wide range of applications [17].…”

Section: Introductionmentioning

confidence: 99%

Comparative study of different alloys during thermal debind-ing of powder injection molded parts

El-Garaihy

Nassef

El-Hadek

2016

IJET

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Powder injection molding (PIM) is an interesting technique and address of research, in which a thermoplastic polymeric material is used to form the powder into the desired shape in a closed die. Binders have a crucial importance in the powder metallurgy technology as they play a vital role to provide efficient powder agglomeration and/or lubrication during shaping. At the same time, they have to be easily removed from the compacts during initial stages of sintering, using debinding process, without any damaging effect for the base material. Thermal debinding is a vital process requiring somewhat elevated temperatures to remove binder from the compact. In the current study, an investigation has been made about the effect of process variables on the debinding of injection molded pieces, by melt wicking. The debinding process was performed at temperatures ranging from 160-up to-200°C for a time duration varying from 1-up to-27 hours. All powders used in injection molding feedstock have an inherent packing porosity. Several types of alloy powders (Carbonyl iron steel, Nickel aluminide, and 316L stainless powders), with various size distributions, particle shapes, and materials are adopted to define the influence on binder incorporation resulted from this inherent porosity. Results revealed that the increase of debinding time or decrease in the wicking powder (alumina) particle size lead to an increase in the thickness of the adhered layer of alumina. When the wicking powder is very fine (0.3 m) or has a wide particle size range (<10 m), it becomes more dense and its debinding efficiency is decreased. At high debinding temperatures (200 °C) the rate of binder evaporation and removal increased, which leads to decreasing the cohesion of the samples yielding a shape distortion. In addition, the effect of the wicking powder (Al 2 O 3 ) sizes and debinding time on the binder weight loss percentage after debinding process for FeOX, Ni 3 Al, and 316L has been investigated.

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“…Soft micromolding techniques are a series of net-shape and cost-effective methods for fabricating metal and ceramic microcomponents [14][15][16][17]. In soft micromolding techniques, polydimethylsiloxane (PDMS) is often used to replicate microstructures from an original master to form negative micromolds, which are then filled by slurries and dried to form green microcomponents and are subsequently sintered to obtain the final microcomponents.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of iron-nickel alloy microcomponents by centrifuge-assisted micromolding

Zhou

Guo

2015

Int J Adv Manuf Technol

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Iron-nickel alloys exhibit lots of attractive properties, such as magnetic and conductivity properties, as well as excellent corrosion resistance. These properties make them suitable for making microcomponents. This paper presents the fabrication of iron-nickel alloy microcomponents (microchannel, microwell, micromixer, and microgear) from an ethanol-based composite slurry by centrifuge-assisted micromolding. Polydimethylsiloxane (PDMS) molds were replicated from microstructured silicon masters. A stable ethanol-based iron-nickel composite slurry with a high solid content of 85 wt% was prepared and filled into the PDMS molds by the aid of centrifugation. After drying, green microcomponents were demolded and followed by sintering in hydrogen atmosphere. Sintering profile was established by TGA. The green and sintered microcomponents had good shape retention and were free of cracks. The highest density of the microcomponents (97.3 RD%) was achieved at 1070°C; the corresponding microhardness and Young's modulus were 167.8 HV and 175.4 GPa, respectively. The linear shrinkage increased with sintering temperature and the maximum value was about 12.5 %.

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Development of a feedstock formulation based on polypropylene for micro-powder soft embossing process of 316L stainless steel micro-channel part

Abstract: . Development of a feedstock formulation based on polypropylene for micro-powder soft embossing process of 316L stainless steel micro-channel part.

Cited by 14 publications

References 11 publications

Quantitative and representative adherence assessment of coated and uncoated concrete-formwork

Quantitative and representative adherence assessment of coated and uncoated concrete-formwork

Comparative study of different alloys during thermal debind-ing of powder injection molded parts

Fabrication of iron-nickel alloy microcomponents by centrifuge-assisted micromolding

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