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Item type:Publication, Access status: with files , Additive manufacturing of ceramics via the laser powderbed fusion process(American Ceramic Society, 2025-02-22); ; ; ; Additive manufacturing (AM) of ceramics presents both exciting opportunities and significant challenges, particularly with the laser-based AM processes. Ceramics are known for their special properties, such as high strength, corrosion resistance, and temperature stability, but their inherent brittleness and high processing demands make AM more complex. This review provides an updated overview of the most common AM techniques for ceramics, including direct energy deposition, binder jetting, laminated object manufacturing, and material extrusion-based techniques. However, the focus is placed on the laser powder bed fusion (LPBF) of ceramics, a technique that has gained increasing attention for its ability to fabricate complex ceramic parts with enhanced quality. The review delves into the key causes of critical defects commonly observed in LPBF, such as porosity, cracking, spattering, and surface roughness. Recent advancements in addressing these issues are discussed, along with the limitations of current defect prevention strategies. Furthermore, the review provides an updated analysis of the mechanical properties of LPBF-fabricated ceramics, giving insights into how processing parameters influence the performance of ceramic LPBF-printed parts. Modeling and simulation techniques are also reviewed, highlighting their role in enhancing understanding of ceramic behavior during LPBF. Overall, this review highlights recent progress and current challenges in ceramic AM techniques, while exploring future research opportunities, such as process optimization and defect prevention strategies.Publicationtype: Review Article63 46 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: with files , Challenges and opportunities for increase sustainability and energy efficiency in ceramic tile industry(Wiley, 2025); ; The ceramic tile has an estimated global warming potential of 14.4 kg CO2 equivalent per square meter, with CO2 emissions contributing to approximately 92.1% of the overall impact. The total emissions amount to 19 million tons of CO2 annually, representing approximately 1% of Europe's industrial emissions that are regulated by the EU Emissions Trading System. As a result, the ceramic industry is under growing pressure to decrease carbon emissions and improve energy efficiency in accordance with Europe's new climate and energy objectives. However, this process holds a clear challenge. This work addresses the challenges and opportunities facing the ceramic tile industry in reducing carbon emissions and improving energy efficiency in line with new climate and energy goals worldwide. It highlights the importance of adopting innovative strategies across product, process efficiency, and market and supply chain aspects.Publicationtype: Review Article12 64 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , Using polystyrene spheres to produce thin, porous interlayers in alumina laminatesPorous alumina layers were produced by colloidal processing of alumina with the addition of 15, 30, and 45 vol% polystyrene spheres (PS) as pore formers. Alumina laminates were designed with dense layers alternated with porous interlayers using 45 vol% of PS spheres and sintered at 1350°C. The layers’ thickness ranged from 2 to 15 μm, with a random distribution of pores. The higher volume fraction of pores tends to decrease the alumina average grain size, but does not influence the final size of bulk and surface pores. The obtained values of hardness and Young's modulus for the porous interlayer are ∼30% of the values obtained for the dense layer. Vickers indentations suggested that crack propagation can be opposed by the porous interlayers. However, values of mechanical strength, fracture toughness (KIC), and work of fracture presented no relevant difference compared to a monolithic reference. R-curves presented a slight increase and KIC a decrease due to crack propagation through the porous interlayers. Although no macrodeviations of the crack path were observed in the fractured surfaces, microdeviations were detected in the interlayer regions.Publicationtype: Journal Article58 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , Building a sintering front through fast firingHigh-density alumina was produced by fast firing (5 min, temperatures ≤1550°C). Most of densification occurred under nonisothermal conditions. High densification rates observed are related to a change in the internal structure of the compact. The formation of a dense outer alumina layer controlled the heat flux to the interior of the compact, and increased the amount of energy available for sintering. Sintering in fast firing occurred as a densification front moving from the outer surface toward the sample center. As long as the rate of heat transfer is enough to sustain its advance, no differential densification occurs. © 2011 The American Ceramic Society.Publicationtype: Journal Article20