Joamin Gonzalez-Gutierrez

Luxembourg Institute of Science and Technology (LIST) | LIST · Materials Research and Technology (MRT)

Polyamide 12 (PA12) nanocomposites based on halloysite nanotubes (HNTs) were obtained using a batch internal mixer or a twin-screw mini-compounder. In order to analyze the influence of HNTs dispersion on nanocomposite properties, morphological analysis (SEM and TEM) was combined with rheological and thermo-mechanical experiments. The linear viscoel...

Additive manufacturing (AM) is the fabrication of real three-dimensional objects from metals, ceramics, or plastics by adding material, usually as layers. There are several variants of AM; among them material extrusion (ME) is one of the most versatile and widely used. In MEAM, molten or viscous materials are pushed through an orifice and are selec...

Material extrusion‐based additive manufacturing (ME‐AM) is an emerging processing technique that is characterized by the selective deposition of thermoplastic filaments in a layer‐by‐layer manner based on digital part models. Recently, it has attracted considerable attention, as this technique offers manifold benefits over conventional manufacturin...

A special feedstock material consiting of a multicomponent binder and alumina powder has been developed for processing by material extrusion additive manufacturing. Using this novel material support structures for non-plasma catalytic degradation of tolune were produced. The support structure had 2 dimensional chanels and was coated with catalytic...

Metal material extrusion (MMEX) involves the systematic deposition of material layer by layer, followed by debinding and sintering to produce fully dense metallic parts. The feedstocks, initially comprising metal powder and a binder system, are pivotal in determining processability and final properties. This study utilized polylactic acid (PLA) as...

The applications of Nd-Fe-B-based magnets are experiencing significant diversification to achieve efficiency and miniaturization in different technologies. Metal injection molding (MIM) provides new opportunities to manufacture Nd-Fe-B magnets with high geometrical complexity efficiently. In this study, the impacts of the binder system composition...

In the realm of material innovation, the remarkable versatility of thermoplastic-based highly filled composites emerges as a pivotal advantage for fabricating metal parts, seamlessly integrating design flexibility. This study delves into the fusion of design and manufacturing, spotlighting the convergence of material extrusion additive manufacturin...

Additive manufacturing (AM) nowadays has become a supportive method of traditional manufacturing. In particular, the medical and healthcare industry can profit from these developments in terms of personalized design and batches ranging from one to five specimens overall. In terms of polymers, polyolefins are always an interesting topic due to their...

The current study presents the effect of the backbone as an important binder component on the mechanical, rheological, and thermal properties of Aluminium (Al) alloy feedstocks. A thermoplastic elastomer (TPE) main binder component was blended with either polypropylene (PP), grafted-maleic anhydride-PP (PPMA), or grafted-maleic anhydride-PPwax (PPM...

Triple-shape polymers can memorize two independent shapes during a controlled recovery process. This work reports the 4D printing of electro-active triple-shape composites based on thermoplastic blends. Composite blends comprising polyester urethane (PEU), polylactic acid (PLA), and multiwall carbon nanotubes (MWCNTs) as conductive fillers were pre...

Powder injection molding (PIM) is a well-known technique to manufacture net-shaped, complicated, macro or micro parts employing a wide range of materials and alloys. Depending on the pressure applied to inject the feedstock, this process can be separated into low-pressure (LPIM) and high-pressure (HPIM) injection molding. Although the LPIM and HPIM...

Material extrusion (MEX), specially fused filament fabrication (FFF), is the most widespread technology for additive manufacturing, mainly for polymers. MEX can also be used as part of the fabrication process to obtain metal specimens when metal-filled polymer feedstocks are used. Currently, many MEX printers and nozzle designs are available from d...

This work aims to better understand the type of thermoplastic binders required to produce highly loaded copper filaments that can be successfully printed via low-cost filament-based material extrusion (MEX). Compounding feedstock material with 55 vol.% of copper and three multi-component binder systems has been performed. The MEX behavior of these...

Within this work, we demonstrate in-situ alignment of the easy axis single-crystal magnetic particles inside a polymer matrix using fused filament fabrication. Two different magnetic materials are investigated: (i) Strontium hexaferrite inside a PA6 matrix, fill grade: 49 vol% and (ii) Samarium iron nitride inside a PA12 matrix, fill grade: 44 vol%...

The Project INEX-ADAM -Increasing Excellence in Advanced Additive Manufacturing (INEX-ADAM) is a 3-year European Union (EU) funded project to establish networking and synergy among the five research institutions through identification, planning and implementation of Additive Manufacturing (AM) research tracks. The project is coordinated by the Univ...

The development of parameters for a certain additive technology is the key to increase the number of materials that are processed as well as the applications. This chapter shows the details to take into account for the development of parameters for various technologies.

Four-dimensional printing technology, as a next-generation additive manufacturing method, enables printed objects to further change their shapes, functionalities, or properties upon exposure to external stimuli. The 4D printing of programable and deformable materials such as thermo-responsive shape-memory polymers (trSMPs), which possess the abilit...

3D printing (3DP) has emerged in recent years as a form of processing with many exciting aspects. Today, it finds use in the industrial sector as well as among private individuals and small manufacturers, bringing manufacturing closer to end users and helping to bring a multitude of ideas and innovations to life. In this scenario, Chemical Engineer...

Additive manufacturing finds more applications every day, especially in medical devices, ranging from models, tools, to implants. The fabricated parts have to withstand the mechanical loading applied during their lifetime. Hence, optimization of process parameters must be performed to reach the best performance of the manufactured part with the giv...

This study demonstrates metal fused filament fabrication (MF ³ ) as an alternative additive and highly flexible manufacturing method for free-form fabrication of high-performance alloys. This novel processing, which is similar to Metal injection molding (MIM), enables a significant reduction in manufacturing costs for complex geometries, since expe...

Nowadays, personalized medical implants are frequently produced through additive manufacturing. As all medical devices have to undergo specific washing and sterilization before application, the effects of a predefined cleaning routine that is available to the clinical institutes, washing with chemical agent and formaldehyde fumigation, on the mecha...

The most widely used 3D process, fused deposition modeling (FDM), has insufficient interlayer adhesion due to its layer-by-layer forming method. A support material is also essential for the hollow parts and cantilevers. Moreover, the polymer materials used have limited mechanical properties. These issues have restricted the application of FDM in hi...

Within this work, we demonstrate in-situ easy-axis alignment of single-crystal magnetic particles inside a polymer matrix using fused filament fabrication. Two different magnetic materials are investigated: (i) Strontium hexaferrite inside a PA6 matrix, fill grade: 49 vol% and (ii) Samarium iron nitride inside a PA12 matrix, fill grade: 44 vol%. In...

Fabrication of titanium components is very cost intensive, partly due to the complex machining and limited recyclability of waste material. For electrochemical applications, the excellent corrosion resistance of pure titanium is of high importance, whereas medium mechanical strength of fabricated parts is sufficient for such a use case. For smaller...

Material extrusion additive manufacturing (MEX) is a versatile technology for producing complex specimens of polymers, ceramics and metals. Highly-filled filaments composed of a binder system and a high-volume content of sinterable powders are needed to produce ceramic or metal parts. After shaping the parts via MEX, the binder is removed and the s...

Metal injection moulding of miniaturized devices demands unique feedstock materials and mould designs with high dimensional accuracy. In this work, the influences of the powder size and powder content of 17-4 PH stainless steel feedstock and the influence of mould design on the successful production of micro-scaled structures were investigated. Ni...

Functionally Graded Additive Manufacturing (FGAM) is a layered manufacturing process with which the material composition and organization can be achieved within a single volume to enable variable functionalities. In contrast to conventional manufacturing processes, FGAM can produce free-form structures with adaptable, site-specific properties at st...

Photopolymerization has undergone significant development in recent years. It enables fast and easy processing of materials with customized properties and allows precise printing of complex surface geometries. Nevertheless, photopolymerization is mainly applied to cure thin films since the low curing depth limits the fast production of large volume...

Indirect additive manufacturing for metal parts relies on the use of an organic binder that temporarily fixes metal particles during the fabrication process. After a three-dimensional object is produced layer-by-layer, the binder is removed, and the powder is sintered to obtain a metal part. Shaping technologies that can be used for indirect metal...

The Arburg Plastic Freeforming process (APF) is a unique additive manufacturing material jetting method. In APF, a thermoplastic material is supplied as pellets, melted and selectively deposited as droplets, enabling the use of commercial materials in their original shape instead of filaments. The medical industry could significantly benefit from t...

Within this paper, we are dealing with a mixture of thermoplastic polymer that is filled with inorganic fillers at high concentrations up to 60 vol.%. A high number of particles in the compound can substantially change the rheological behaviour of the composite and can lead to problems during processing in the molten state. The rheological behaviou...

Powder extrusion moulding (PEM) is a versatile and cost-effective technology for producing bi-dimensional shapes, (e.g. tubes and profiles) from metals, ceramics and cermets. PEM quality is affected by powder content; therefore, three highly-filled polymeric compounds containing 50, 55, 60 vol% tool steel powder were prepared and extruded to profil...

In the last few years, FFF gained increasing interest as a production method for metal and ceramic parts. Several scientific publications are showing the feasibility of FFF to produce metal and ceramic parts. In the market, filaments based on POM as the main binder component are available. Since the scientific publications do not deal with POM as a...

The fused filament fabrication (FFF) of ceramics enables the additive manufacturing of components with complex geometries for many applications like tooling or prototyping. Nevertheless, due to the many factors involved in the process, it is difficult to separate the effect of the different parameters on the final properties of the FFF parts, which...

Material extrusion (ME) systems offer end-users with a more affordable and accessible additive manufacturing (AM) technology compared to other processes in the market. ME is often used to quickly produce low-cost prototyping with the freedom of scalability where parts can be produced in different geometries, quantities and sizes. As the use of desk...

Additive manufacturing has been applied in many fields, but its layer-by-layer fabrication process leads to a weak inter-layer bond strength of printed parts, so it cannot meet the higher requirements for mechanical properties of the industry. At present, many researchers are studying the printing path planning method to improve the mechanical prop...

Consumer Fused Filament Fabrication (FFF) desktop 3D printers are used for prototyping, spare parts and even small-scale production, but produce parts with lower tensile strength than traditional manufacturing methods. High tensile continuous fibers increase filament composite strength, but poor fiber adhesion and pull-out are common weaknesses. Th...

The adhesion of the polymer to ceramic nanoparticles is a key aspect in the manufacturing of ceramic parts by additive manufacturing and injection molding, due to poor separation results in separation during processing. The purpose of this research is to investigate, by means of molecular dynamics simulations and experimental methods, the role of i...

Fused filament fabrication (FFF) combined with debinding and sintering could be an economical process for three-dimensional (3D) printing of metal parts. In this paper, compounding, filament making, and FFF processing of feedstock material with 55% vol. of 17-4PH stainless steel powder in a multicomponent binder system are presented. The experiment...

Thermoplastic filaments charged with powder can be used for the production of metallic and ceramic components by means of the Material Extrusion Additive Manufacturing method known as Fused Filament Fabrication (FFF). Using parts shaped by FFF, dense components can be obtained through the post-treatment processes of debinding and sintering. One of...

Fused Layer Modelling (FLM) is one out of several material extrusion (ME) additive manufacturing (AM) methods. FLM usually deals with processing of polymeric materials but can also be used to process metal-filled polymeric systems to produce metallic parts. Using FLM for this purpose helps to save costs since the FLM hardware is cheap compared to e...

Material extrusion additive manufacturing with filaments is also known as Fused Filament Fabrication (FFF). FFF is a versatile and popular technology that, when combined with debinding and sintering, can be used for the fabrication of functional metal and/or ceramic parts similar to Powder Injection Moulding (PIM). In order to produce filaments, th...

Employment of ready-to-press (RTP) powders are common in the field of hardmetal manufacture. Various grades of such powder products are available on the market for companies without an own production line for the granulation of powders. In our study we employed such RTP powders for compounding with polymers to prepare feedstock and prepared flexibl...

By using filaments comprising metal or ceramic powders and polymer binders, solid metal and ceramic parts can be created by combining low-cost fused filament fabrication (FFF) with debinding and sintering. In this work, we explored a fabrication route using a FFF filament filled with 316 L steel powder at 55 vol.-%. We investigated the printing, de...

Due to a lack of long-term experience with burgeoning material extrusion-based additive manufacturing technology, also known as fused filament fabrication (FFF), considerable amounts of expensive material will continue to be wasted until a defect-free 3D-printed component can be finalized. In order to lead this advanced manufacturing technique towa...

Material Extrusion Additive Manufacturing (MEAM) is mainly used for the production of polymeric components. Using feedstocks similar to those of powder injection moulding, MEAM of ceramic components is possible. MEAM with filaments is also called Fused Filament Fabrication. Feedstocks are used as filaments; this imposes new requirements such as fle...

Hardmetal and cermet bodies were printed by fused-filament fabrication (FFF) and composite-extrusion modelling (CEM) in an SDS (shaping – debinding – sintering) process. For FFF the filaments were prepared from hardmetal (WC-10Co) and cermet powder (Ti(C,N)-Co/Ni-based) and organic binder. The CEM feedstock consisted of WC-Co MIM powder. A 3D filam...

Material extrusion additive manufacturing can be used for producing metal specimens when combined with debinding and sintering, similar to metal injection moulding. A highly-filled polymeric filament containing 55 vol% of 17-4PH stainless steel powder was prepared and used to print dog-bone specimens. Printed specimens were debound and sintered to...

Additive manufacturing is fast-growing and a most interesting fabrication technology also for parts prepared out of composite materials. We recently reported on the first ever conducted extrusion-printing techniques on WC-Co-based hardmetals and Ti(C,N)-based cermets. While both materials were prepared with multiphase starting mixtures blended in a...

Fused Filament Fabrication (FFF) is a material extrusion based additive manufacturing technique that enables the processing of thermoplastic filaments, which are selectively extruded and deposited in a layer-wise manner to create three-dimensional objects. Filaments of polymer-based compounds highly-filled with ceramic powders (ca. 40-60 vol.%), kn...

The material extrusion additive manufacturing technique known as fused filament fabrication (FFF) is an interesting method to fabricate complex ceramic parts whereby feedstocks containing thermoplastic binders and ceramic powders are printed and the resulting parts are subjected to debinding and sintering. A limiting factor of this process is the d...

Fused Filament Fabrication (FFF) is a type of material extrusion (ME) additive manufacturing and it is one of the most commonly used polymer-based additive manufacturing techniques. FFF can be used to shape parts with feedstocks similar to the ones used in Powder Injection Moulding (PIM). Thus, green parts are manufactured which in the following st...

In Powder Injection Moulding (PIM) and Fused Filament Fabrication (FFF) of ceramic and metallic components, thermoplastic polymer compounds are highly-filled with powder of the final material. These feedstocks are used to produce green parts. Later on, the polymeric components are removed in the debinding step and the final components are obtained...

Polypropylene (PP) parts produced by means of extrusion-based additive manufacturing, also known as fused filament fabrication, are prone to detaching from the build platform due to their strong tendency to shrink and warp. Apart from incorporating high volume fractions of fillers, one approach to mitigate this issue is to improve the adhesion betw...