Coupling additive manufacturing and microwave sintering: A fast processing route of alumina ceramics

Curto, Hugo; Thuault, Anthony; Jean, Florian; Violier, Maxence; Dupont, Vedi; Hornez, Jean‐Christophe; Leriche, Anne

doi:10.1016/j.jeurceramsoc.2019.11.009

Cited by 44 publications

(18 citation statements)

References 39 publications

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“…Complex-shape alumina parts were produced using microwave sintering by Curto et al The shaped parts had high relative density (98%) and improved elastic modulus and Vickers hardness [28].…”

Section: Application Of Microwave Sintering In the Fabrication Of Different Engineering Materialsmentioning

confidence: 99%

A Review of Microwave-Assisted Sintering Technique

Ćurković

Veseli

Gabelica

et al. 2021

TFAMENA

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The present study examines the potential of microwave heating as an emerging and innovative energy-efficient alternative to conventional heating techniques used for different materials, with a focus on the processing of ceramic materials. Modern ceramics are studied extensively, and their use and different applications are wide due to many advantages of these materials. The most important factor in microwave sintering which differentiates it from conventional heating techniques is a unique heat transfer mechanism. Microwave energy is absorbed by the material, hence the transfer of energy takes place at the molecular level. This way, the heat is generated throughout the material, i.e. on the inside as well on the outside. This allows a very low temperature gradient throughout the material cross section. When conventional sintering is used, typically at high heating rates, high temperature gradients pose a problem. The accelerated microwave heating occurs through the whole volume, so the heating is uniform, which limits the grain growth and coarsening, and leads to a uniform and fine microstructure. The densification is accelerated as well during the unique heat transfer mechanism of microwave sintering, which enhances the mechanical properties of the sintered materials.This paper discusses the use of microwave sintering in the manufacturing of different modern technical materials, namely ceramics, composites, metals and alloys, and glasses. The improvement of different properties is described using the available literature.

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“…Complex-shape alumina parts were produced using microwave sintering by Curto et al The shaped parts had high relative density (98%) and improved elastic modulus and Vickers hardness [28].…”

Section: Application Of Microwave Sintering In the Fabrication Of Different Engineering Materialsmentioning

confidence: 99%

A Review of Microwave-Assisted Sintering Technique

Ćurković

Veseli

Gabelica

et al. 2021

TFAMENA

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“…Full-density final samples can be obtained at atmospheric pressure. Gradual heating in conventional and vacuum furnaces with diverse atmospheres [17][18][19], spark plasma sintering [20], or using a microwave furnace [21,22] are the main approaches to sintering ceramics to create fully dense parts, with alumina components among them. The initial particle size; the presence of defects and agglomerates; the starting density; and, of course, the sintering cycle parameters, all affect the sintering process.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Sintering of DLP Printed Alumina Ceramics

et al. 2022

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Digital Light Processing (DLP) technology exhibits the capability of producing components with complex structures for a variety of technical applications. Postprocessing of additively printed ceramic components has been shown to be an important step in determining the final product resolution and mechanical qualities, particularly with regard to distortions and resultant density. The goal of this research is to study the sintering process parameters to create a nearly fully dense, defect-free, ceramic component. A high-solid-loading alumina slurry with suitable rheological and photopolymerisable characteristics for DLP was created. TGA/DSC analysis was used to estimate thermal debinding parameters. The sintering process of the debound parts was studied by employing a numerical model based on thermo-viscoelasticity theory to describe the sintering process. The validated Finite Element Modelling (FEM) code was capable of predicting shrinkage and relative density changes during the sintering cycle, as well as providing meaningful information on the final shape. Archimedes’ principle and scanning electron microscope (SEM) were used to characterise the sintered parts and validate the numerical model. Samples with high relative density (>98.5%) were produced and numerical data showed close matches for predicted shrinkages and relative densities, with less than 2% mismatch between experimental results and simulations. The current model may allow to effectively predict the properties of alumina ceramics produced via DLP and tailor them for specific applications.

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“…In that regard, microwave radiation heating has shown some significant advantages over conventional heating [ 1 , 2 , 3 ]. Microwave heating is a non-conventional technique that involves high heating rates and rapid processing times [ 4 , 5 , 6 ]. The properties of most materials heated by microwave radiation showed similar or superior properties to those obtained by conventional processing [ 7 , 8 , 9 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Microwave-Assisted Synthesis and Sintering of Lead-Free KNL-NTS Ceramics

Lagunas-Chavarría

Navarro-Rojero²,

Salvador

et al. 2022

Materials

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Lead-free piezoelectric powders (K0.44Na0.52Li0.04)(Nb0.82Ta0.10Sb0.04)O3 were obtained by conventional and microwave-assisted reactive heating. Firstly, the synthesis of the material was carried out following the mixed oxide route and employing both traditional methods and microwave technology. Thermogravimetry, X-ray diffraction, field emission scanning electron microscopy and electrical properties analyses were evaluated. X-ray diffraction of the powders calcined by the microwave process shows the formation of perovskite structure with orthorhombic geometry, but it is possible to observe the presence of other phases. The presence of the secondary phases found can have a great influence on the heating rate during the synthesis on which the kinetics of the reaction of formation of the piezoelectric compound depend. The calcined powder was sintered at different temperatures by conventional and non-conventional processes. The microstructure of the ceramics sintered by microwave at 1050 °C for 10 min shows perovskite cubes with regular geometry, of size close to 2–5 µm. However, the observed porosity (~8%), the presence of liquid phase and secondary phases in the microstructure of the microwave sintered materials lead to a decrease of the piezoelectric constant. The highest d33 value of 146 pC/N was obtained for samples obtained by conventional at 1100 °C 2 h compared to samples sintered by microwave at 1050 °C 10 min (~15 pC/N).

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Coupling additive manufacturing and microwave sintering: A fast processing route of alumina ceramics

Cited by 44 publications

References 39 publications

A Review of Microwave-Assisted Sintering Technique

A Review of Microwave-Assisted Sintering Technique

Numerical Simulation of Sintering of DLP Printed Alumina Ceramics

Effect of Microwave-Assisted Synthesis and Sintering of Lead-Free KNL-NTS Ceramics

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