Experimental analysis and numerical simulation of sintered micro-fluidic devices using powder hot embossing process

Sahli, Mohamed; Mamen, Belgacem; Ou, Huibin; Gelin, Jean‐Claude; Barrière, Thierry; Assoul, Mohamed

doi:10.1007/s00170-018-2509-5

Cited by 11 publications

(10 citation statements)

References 51 publications

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“…The density of the final parts produced by powder hot embossing ranged from 93% [20] to 98.2% [56]. This density strongly depends on a good practice of debinding and sintering, being also dependent on different parameters such as powder loading.…”

Section: Final Partsmentioning

confidence: 99%

“…It has been demonstrated that the density has increased significantly (from 96% to 97.8%) with the increase in sintering temperature (1200-1360 • C) in samples produced with a SAE 316L stainless steel feedstock [23]. Another study [56] analyzed the effect of different powder loadings (PL of 60, 62 and 64 vol.%) and showed that feedstocks with higher power loadings lead to parts with higher density. In the same study, it was also demonstrated that sintering kinetics affects the density of the final parts since higher kinetics, caused by the thermal shock resulting from a higher heating rate, decreases porosity faster and, in turn, increases density.…”

Section: Final Partsmentioning

confidence: 99%

See 1 more Smart Citation

Development of Metal Powder Hot Embossing: A New Method for Micromanufacturing

Sequeiros

Emadinia

Vieira

et al. 2020

Metals

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Hot embossing is a small-scale, low-cost processing technology that can deliver products to the market in a short time. This microreplication technology is well established to produce polymeric components and has applications in several industrial sectors. The use of micropowder hot embossing in the production of metal components is an emerging and challenging process that, when compared to other typical technologies, brings some economic advantages in a volatile market with an increasing tendency to manufacture customized products. The main objective of this review is to analyze the potential of powder hot embossing and its developments in the production of metallic microparts/components. This technology requires four distinct steps: (1) production feedstock (preparation of mixtures), (2) hot embossing (shape forming), (3) debinding and (4) sintering. These steps are interrelated and influence the characteristics of the final metallic microparts. This study summarizes the approaches implemented for the use of different metallic powders and polymeric binder systems for the preparation of the feedstock, the mold materials and the critical conditions tested in the embossing step to produce green parts, and the production of the final parts through the application of debinding and sintering. Powder hot embossing is a viable replication technology that allows the production of new metallic microcomponents, contributing to the global scientific effort of miniaturizing manufacturing process, equipment and products. The merit of powder hot embossing for industrialization needs further development to assert itself in the market and compete with other micromanufacturing techniques.

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Section: Final Partsmentioning

confidence: 99%

Section: Final Partsmentioning

confidence: 99%

Development of Metal Powder Hot Embossing: A New Method for Micromanufacturing

Sequeiros

Emadinia

Vieira

et al. 2020

Metals

View full text Add to dashboard Cite

show abstract

“…The structural damages can be predicted using this software. Meanwhile, the processing parameters during the demolding step can also be optimized 80,[141][142][143][144][145][146][147] to reduce the possible damages caused by the demolding force. The simulation methodology of macroscopic simulations can be summarized as follows:…”

Section: Review Papermentioning

confidence: 99%

Development and Application of Hot Embossing in Polymer Processing: A Review

Sun¹,

Zhuang²,

Liu³

et al. 2019

ES Mater.Manuf.

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Hot embossing of polymer materials is a promising technology for the fabrication of high quality and precision patterns on the micro/nanoscales. There are three basic forms of hot embossing including, plate-to-plate (P2P), roll-to-plate (R2P), and roll-to-roll (R2R) hot embossing. It also can be divided into isothermal and non-isothermal hot embossing according to the different temperature control modes of polymer substrates and structured molds. This review reports recent progress made of hot embossing methods in polymer processing and the efforts to shorten its processing period for commercial applications. Research and innovations in simulation of hot embossing process and mold fabrication are also comprehensively summarized. Within this review, microfluidics, light guide plate (LGP), and other novel applications of hot embossing are systematically cataloged. Finally, challenges and future trends of hot embossing in polymer processing are presented and forecasted.

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“…In the last decade, the optimisation of this new replicative process for metallic powder remains an objective of the research. Several scientific studies address the control of the main factors determining the quality of hot embossing parts, such as shaping process parameters (temperature, pressure, and time), rheological properties, and die surface finishing [7][8][9][10][11][12][13][14]. Hot embossing and micro hot embossing techniques can be carried out in the laboratory using a relatively unsophisticated hot press [15].…”

Section: Introductionmentioning

confidence: 99%

“…The micro metal powder hot embossing technology requires five steps, as follows: 1materials selection (powder and binders); 2mixing (feedstocks production); 3hot embossing (shape forming applying temperature and pressure for a time); 4debinding; 5 sintering. These steps are correlated, and each stage's variables interact and have a prominent role in the final properties of metal parts [5,[7][8][9][10][11][12][13][14][15]. A few previous studies shed some light on the successful application of metal powder embossing: feedstocks for PIM are suitable to micro metal powder hot embossing [5]; soft dies (silicone rubber dies) are appropriate to replicate features with high quality [7]; the three fundamental shaping parameters (temperature, pressure, and time) are interrelated and are all critical [5,[7][8][9][10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Micro metal powder hot embossing: influence of binder on austenitic stainless steel microparts replicability

Sequeiros

Vieira

2021

Powder Metallurgy

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Micro hot embossing is a well-established technology to produce polymer microdevices and parts. This technology on metal powder/binder feedstocks is an innovator challenge that fits into the sustainable circular economy, being excellent for small series production of precision metallic parts. The powder hot embossing technology is integrated into processes denominated SDS (shaping, debinding, and sintering). This study presents the feasibility of replicating the die features into metallic parts by comparing two binders (Lc and M1). A new binder involves optimising critical parameters during hot embossing to ensure the replication of microdetails and the quality of metallic parts. Comparing the two binders, Lc contributes to the best precision of geometric details, and M1 improves surface quality. The study shows that hot powder embossing is a promising process to manufacture metallic parts with high precision and high-quality geometrical features on a microscale.

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Experimental analysis and numerical simulation of sintered micro-fluidic devices using powder hot embossing process

Cited by 11 publications

References 51 publications

Development of Metal Powder Hot Embossing: A New Method for Micromanufacturing

Development of Metal Powder Hot Embossing: A New Method for Micromanufacturing

Development and Application of Hot Embossing in Polymer Processing: A Review

Micro metal powder hot embossing: influence of binder on austenitic stainless steel microparts replicability

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