Abstract: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 manufactu… Show more
“…The polymer sheet is continuously passed through the rollers as shown in Figure . Hot embossing is a small-scale, low-cost processing technology that can deliver products to the market in a short time . The major challenge is to ensure complete filling of the cavity on the embossing tool with the work material to achieve the maximum accuracy …”
Understanding fluid flow characteristics in porous medium,
which
determines the development of oil and gas oilfields, has been a significant
research subject for decades. Although using core samples is still
essential, micro/nanofluidics have been attracting increasing attention
in oil recovery fields since it offers direct visualization and quantification
of fluid flow at the pore level. This work provides the latest techniques
and development history of micro/nanofluidics in oil and gas recovery
by summarizing and discussing the fabrication methods, materials and
corresponding applications. Compared with other reviews of micro/nanofluidics,
this comprehensive review is in the perspective of solving specific
issues in oil and gas industry, including fluid characterization,
multiphase fluid flow, enhanced oil recovery mechanisms, and fluid
flow in nano-scale porous media of unconventional reservoirs, by covering
most of the representative visible studies using micro/nanomodels.
Finally, we present the challenges of applying micro/nanomodels and
future research directions based on the work.
“…The polymer sheet is continuously passed through the rollers as shown in Figure . Hot embossing is a small-scale, low-cost processing technology that can deliver products to the market in a short time . The major challenge is to ensure complete filling of the cavity on the embossing tool with the work material to achieve the maximum accuracy …”
Understanding fluid flow characteristics in porous medium,
which
determines the development of oil and gas oilfields, has been a significant
research subject for decades. Although using core samples is still
essential, micro/nanofluidics have been attracting increasing attention
in oil recovery fields since it offers direct visualization and quantification
of fluid flow at the pore level. This work provides the latest techniques
and development history of micro/nanofluidics in oil and gas recovery
by summarizing and discussing the fabrication methods, materials and
corresponding applications. Compared with other reviews of micro/nanofluidics,
this comprehensive review is in the perspective of solving specific
issues in oil and gas industry, including fluid characterization,
multiphase fluid flow, enhanced oil recovery mechanisms, and fluid
flow in nano-scale porous media of unconventional reservoirs, by covering
most of the representative visible studies using micro/nanomodels.
Finally, we present the challenges of applying micro/nanomodels and
future research directions based on the work.
“…Other characteristics of ASS powder are summarised in Table 1. The powder characteristics are important since they influence the rheology of the feedstocks, which, in turn, affects the process parameters of powder hot embossing, similarly to what occurred with the PIM process [16]. Figure 1 SAE 316L powder characteristics.…”
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.
“…The filaments used in metal-based ME result from the extrusion of feedstock, a mixture of metallic powders combined with a specific concentration of a polymeric binder system, in the correct proportions (usually 60% metallic and 40% polymer feedstocks). The purpose of the mixture, similar to metal hot embossing and metal injection molding (MIM), is to disperse the metal powder in the binder, avoiding internal porosity and agglomeration, which enables a homogeneous biphasic mixture (Sequeiros et al 2020;Singh et al 2019b;Gonzalez-Gutierrez et al 2018b). The powder characteristics influence the filament's rheological behavior in its production and metal ME processes.…”
Section: Introductionmentioning
confidence: 99%
“…The optimization of debinding depends on the characteristics of the binder system and components. Several debinding techniques exist, like solvent debinding, catalytic treatment, thermal treatment, or a combination of two or more (Sequeiros et al 2020). The objective of debinding is to gradually remove the binder materials to keep the manufactured components' shape (Singh et al 2019b).…”
Section: Introductionmentioning
confidence: 99%
“…The objective of debinding is to gradually remove the binder materials to keep the manufactured components' shape (Singh et al 2019b). Brown parts, designation after debinding, require a graduate removal of binder to avoid defects (Sequeiros et al 2020;Gonzalez-Gutierrez et al 2018b) and shape loss due to the removal of the binder. Poor debinding conditions can impact the components' porosity since carbon residues can influence the sintering process, promoting bloating, blistering, surface cracking, and large internal voids, which will increase the difficulty of achieving a highly dense component (Gonzalez-Gutierrez et al 2018a).…”
Additive manufacturing (AM) is one of the most trending technologies nowadays, and it has the potential to become one of the most disruptive technologies for manufacturing. Academia and industry pay attention to AM because it enables a wide range of new possibilities for design freedom, complex parts production, components, mass personalization, and process improvement. The material extrusion (ME) AM technology for metallic materials is becoming relevant and equivalent to other AM techniques, like laser powder bed fusion. Although ME cannot overpass some limitations, compared with other AM technologies, it enables smaller overall costs and initial investment, more straightforward equipment parametrization, and production flexibility.This study aims to evaluate components produced by ME, or Fused Filament Fabrication (FFF), with different materials: Inconel 625, H13 SAE, and 17-4PH. The microstructure and mechanical characteristics of manufactured parts were evaluated, confirming the process effectiveness and revealing that this is an alternative for metal-based AM.
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