{"title":"Sonochemical synthesis of luminescent Nd2O3 nanoparticles and optimization of NIR luminescence through precursor selection and annealing process","authors":"Pedro Perdigon-Lagunes, Ciro Falcony-Guajardo","doi":"10.1016/j.ceramint.2025.03.134","DOIUrl":"10.1016/j.ceramint.2025.03.134","url":null,"abstract":"<div><div>A novel approach to synthesize neodymium oxide nanoparticles with enhanced emission at 1056 nm, utilizing a bioreduction-sonochemical process using tannic acid is presented. The precursors and postprocessing techniques were systematically investigated to improve light emission due to transitions among the inter-electronic energy levels associated with Nd<sup>3+</sup>. An extensive analysis was performed on the characteristics presented by the phosphors obtained using various precursor reactives including Nd(NO<sub>3</sub>)<sub>3</sub>, NdCl<sub>3</sub>, NaOH, KOH, and different annealing treatments. TEM micrographs revealed finely tuned nanoparticles, in the range of 5–60 nm in diameter, enveloped in tannic acid residues; consequently, agglomerations of nanoparticles between 60 and 170 nm were self-assembled measured by DLS. PXRD and Raman spectroscopy confirmed the formation of Nd<sub>2</sub>O<sub>3</sub>, along with subproducts such as NaNO<sub>3</sub>, KNO<sub>3</sub>, NaCl, KCl, and distinctive surface groups, depending on the specific synthesis process studied. Significantly, luminescence measurements demonstrated a remarkable enhancement in signal intensity and quality. To avoid luminescence quench, anneal treatment was used; however, the optimization of the annealing processes was achieved through TGA studies. A self-assembly mechanism is proposed to elucidate the formation process of these neodymium oxide nanoparticles.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 18","pages":"Pages 24511-24519"},"PeriodicalIF":5.1,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144519018","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Saman Q. Mawlud, Ahmed A. Ahmed, Hiwa L. Hamad, Aso F. Mohamed
{"title":"Investigation of mechanical and chemical durability properties of oxide modifiers incorporated tellurite glass: Ternary oxide glass","authors":"Saman Q. Mawlud, Ahmed A. Ahmed, Hiwa L. Hamad, Aso F. Mohamed","doi":"10.1016/j.ceramint.2025.03.158","DOIUrl":"10.1016/j.ceramint.2025.03.158","url":null,"abstract":"<div><div>Commonly believed, glass is more chemically durable than the majority of other materials. However, corrosion occurs when a glass piece is exposed to a liquid solution. This study investigates the durability and mechanical properties of zinc tellurite glasses as a function of their chemical composition for different oxide modifiers (Na<sub>2</sub>O, B<sub>2</sub>O<sub>3</sub>, CaO, and P<sub>2</sub>O<sub>5</sub>). Glasses systems based on 60TeO<sub>2</sub>-30ZnO-10Na<sub>2</sub>O (TZN), 75TeO<sub>2</sub>-10ZnO-15 B<sub>2</sub>O<sub>3</sub> (TZB), 70TeO<sub>2</sub>-10ZnO-20CaO (TZC) and 75TeO<sub>2</sub>-15ZnO-10P<sub>2</sub>O<sub>5</sub> (TZP) reported here were prepared by melt-quenching technique. The amorphous nature of the prepared glasses is tested using the X-ray diffraction (XRD) technique. The glasses' hardness (HV) and tensile strength were examined by microhardness Vickers's indentation. Phosphate as an oxide modifier content significantly impacts the glass's hardness, TZP glass possesses the highest hardness, 698.7 HV. The chemical durability of the glass was performed by immersing it in a sulfuric acid solution with a pH of 2 for 15 days. Microstructural characterization was performed using scanning electron microscopy (SEM) to study the morphology and structural changes of the glass samples. The attractive characteristics of chemical stability and enhanced mechanical properties suggest that the TZP glass can be designated as a suitable host for long-life optoelectronic applications that perform well in various environments.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 18","pages":"Pages 24769-24775"},"PeriodicalIF":5.1,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144519020","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Multifunctional hybrid red fluorescent nanopigments: Photoluminescence, photocatalytic and advanced forensic applications","authors":"D.P. Aarti , R.B. Basavaraj , M.B. Madhusudana Reddy , Sanjay S. Majani","doi":"10.1016/j.ceramint.2025.03.156","DOIUrl":"10.1016/j.ceramint.2025.03.156","url":null,"abstract":"<div><div>In recent years, research was mostly centred on understanding local structure, defect engineering and excitation-dependent spectroscopy in lanthanide ions doped phosphors. In this report, a simple combustion method was utilized to synthesize the intense red emitting BaZrO<sub>3</sub>:Eu<sup>3+</sup> nanopigments. The obtained fluorescent nanopigments were examined for their structural, morphological, photoluminescence, photocatalytic and advanced forensic studies. The powder X-ray diffraction (PXRD) outcomes exhibited simple cubic structure. The scanning electron microscopy (SEM) micrographs revealed the hexagonal rod-like structures. Further, the particle size was estimated using Transmission electron microscope (TEM) images and it was observed to be around 45 nm. The fluorescence nanopigments were checked for their luminescence behaviours by means of excitation and emission plots. The four significant peaks of Eu<sup>3+</sup> ions located at <sup>5</sup>D<sub>0</sub>→7F<sub>0</sub> (578 nm), <sup>5</sup>D<sub>0</sub>→<sup>7</sup>F<sub>1</sub> (591 nm), <sup>5</sup>D<sub>0</sub>→ <sup>7</sup>F<sub>2</sub> (601 nm), <sup>5</sup>D<sub>0</sub>→F<sub>3</sub> (612 nm) were observed under 396 nm excitation wavelength. The fluorescence lifetime decay measurements were carried and found average lifetime 26.74 ns. The efficiency of the fluorescent nanopigments was evaluated by chromaticity color diagrams as well as internal quantum efficiency (IQE) and color purity. The quantum efficacy and color purity values were found to be 76 % and 94 % respectively. The synthesized nanopigments were also studied for their excellent photocatalytic properties. The results indicated that, the present powders can be successfully used as dye removal in the treatment of polluted water. The obtained nanopowders were also evaluated for their advanced forensic applications. The powders exhibited excellent visualization of latent fingerprints on several substrate surfaces without any background interference. The fingerprint ridge details such as Type 1, 2, 3 were identified and reported. The recorded all results demonstrated that, the synthesized nanopowders can be essentially utilized as dye removal in the polluted water, red component in white LED fabrication and also in advanced forensic applications.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 18","pages":"Pages 24740-24752"},"PeriodicalIF":5.1,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144519021","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Xinru Wang , Xiaosong Zhang , Yueming Zhang , Guanghui Liu , Baozeng Zhou , Lina Kong , Jianping Xu , Lan Li
{"title":"3.46 μm mid-infrared emission from lead-free double perovskite fluorine glass and multi-wavelength array gas real-time monitoring applications in hydrogen energy","authors":"Xinru Wang , Xiaosong Zhang , Yueming Zhang , Guanghui Liu , Baozeng Zhou , Lina Kong , Jianping Xu , Lan Li","doi":"10.1016/j.ceramint.2025.03.209","DOIUrl":"10.1016/j.ceramint.2025.03.209","url":null,"abstract":"<div><div>The current industrial hydrogen production processes generate hydrogen gas containing various impurities, including hydrogen chloride and carbon dioxide, which may affect its usability. Optical temperature sensing plays a crucial role in hydrogen energy research, with particular emphasis on the importance of light sources emitting wavelengths that match the absorption wavelengths of the target gas. For instance, the 3.4 μm wavelength corresponds to the absorption of HCl gas, yet the literature lacks reports on light source materials that match this particular requirement. This study focuses on exploring a series of infrared light source arrays that emit wavelengths matching the absorption wavelengths of gases, specifically emphasizing the 3.4 μm wavelength as it aligns with HCl gas absorption. There have been limited instances of luminescent durations surpassing 3 μm reported. In this work, the Cs<sub>2</sub>AgIn<sub>1-x</sub>Tm<sub>x</sub>Cl<sub>6</sub>-ZBLAY perovskite fluoride glass emits mid-infrared luminescence at 3.46 μm, a key finding as it coincides with the distinctive absorption peaks of HCl gas at the same 3.4 μm wavelength. First-principles calculations were performed to enhance understanding of the density of states and electronic energy band structure of Cs<sub>2</sub>AgIn<sub>1-x</sub>Tm<sub>x</sub>Cl<sub>6</sub>. Cs<sub>2</sub>AgIn<sub>1-x</sub>Tm<sub>x</sub>Cl<sub>6</sub>-ZBLAY perovskite fluoride glass, indicating its potential as a future material for mid-infrared emission. It is non-toxic and emits mid-infrared light at a wavelength of 3.46 μm, which is expected to be useful in infrared imaging, biomedicine, gas detection and other applications. Therefore, a real-time gas-monitoring device with a multi-wavelength array using Cs<sub>2</sub>AgIn<sub>1-x</sub>Tm<sub>x</sub>Cl<sub>6</sub>-ZBLAY,Cs<sub>2</sub>AgIn<sub>1-x</sub>Er<sub>x</sub>Cl<sub>6</sub>-ZBLAN, and ZBLAN: Ho has been designed.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 18","pages":"Pages 25269-25280"},"PeriodicalIF":5.1,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144519027","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Yaozheng Qian , Fangjun Lei , Youpeng Wang , Hongzhi Yang , Shengli Pang , Haiyan Ji , Xudong He , Hao Lou , Kaijie Xu , Chonglin Chen
{"title":"Segregation-free perovskite oxides enabled by a thermal relaxing-shocking strategy for active and durable oxygen catalysis","authors":"Yaozheng Qian , Fangjun Lei , Youpeng Wang , Hongzhi Yang , Shengli Pang , Haiyan Ji , Xudong He , Hao Lou , Kaijie Xu , Chonglin Chen","doi":"10.1016/j.ceramint.2025.03.203","DOIUrl":"10.1016/j.ceramint.2025.03.203","url":null,"abstract":"<div><div>Inert segregations are persistent challenges limiting the application of perovskite oxides as oxygen catalysts in solid oxide fuel cells (SOFCs), solid oxide electrolysis cells, chemical sensors, and high-temperature oxygen separation membranes. Herein, we present a thermal relaxing-shocking strategy that makes segregation-free perovskite oxides feasible. For the thermal relaxing process, La<sub>0.6</sub>Sr<sub>0.4</sub>Co<sub>0.2</sub>Fe<sub>0.8</sub>O<sub>3-δ</sub> (LSCF) is subjected to prolonged heat treatment at high temperatures. As the segregation layer grows during this phase, the lattice strain and electrostatic interactions between chemical defects in LSCF are effectively relaxed, and the diffusion rate of segregated metal ions to the surface approaches zero. In the subsequent thermal shocking process, the relaxed LSCF is quenched in liquid nitrogen, which removes the segregation layer without damaging its microstructure. The LSCF treated with the thermal relaxing-shocking process exhibits high oxygen catalytic activity, operates stably in SOFC systems over extended periods, and shows no observable surface segregation layer. This finding offers a new avenue for the design and development of advanced catalysts.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 18","pages":"Pages 25218-25223"},"PeriodicalIF":5.1,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144519119","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Yang Xiao , Jie Li , Yan Yang , Yida Lei , Yanlin Ma , Yingli Liu
{"title":"Reducing the FMR Linewidth of high-dielectric-constant BiZr-YIG ferrites by adjusting the pre-sintering temperature","authors":"Yang Xiao , Jie Li , Yan Yang , Yida Lei , Yanlin Ma , Yingli Liu","doi":"10.1016/j.ceramint.2025.03.186","DOIUrl":"10.1016/j.ceramint.2025.03.186","url":null,"abstract":"<div><div>Reducing the ferromagnetic resonance (FMR) linewidth of high-dielectric-constant yttrium iron garnet (YIG) ferrites is beneficial for the miniaturization of microwave devices. This study systematically investigated the phase evolution, microstructure, dielectric spectra, hysteresis loops, and FMR linewidth of BiZr-YIG ferrites at different pre-sintering temperatures (T<sub>p</sub>), elucidating the mechanisms by which pre-sintering temperature affects its electromagnetic properties. Adjusting the pre-sintering temperature enhanced the densification of the BiZr-YIG ferrites. This adjustment led to a 65 % reduction in FMR linewidth while further increasing the relative dielectric constant. The saturation magnetization remained stable at approximately 27.00 emu/g. At T<sub>p</sub> = 1000 °C, the BiZr-YIG ferrites exhibited a high relative dielectric constant (ε<sub>r</sub> = 22.50), stable saturation magnetization (M<sub>s</sub> = 27.09 emu/g), and a narrow FMR linewidth (ΔH = 92.37 Oe). These results indicate that adjusting the pre-sintering temperature to optimize the phase formation and crystallinity of the pre-sintered powder is highly valuable for reducing the FMR linewidth of high-dielectric-constant YIG ferrites, promoting its application in the miniaturization of microwave devices.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 18","pages":"Pages 25042-25051"},"PeriodicalIF":5.1,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144519202","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Jianfeng Wu , Xinxin Shi , Shaoheng Liu , Xiaohong Xu , Yaqiang Shen , Deng Zhang
{"title":"Research on the sintering temperature and absorptivity of corundum-based endothermic ceramics for solar thermal power generation","authors":"Jianfeng Wu , Xinxin Shi , Shaoheng Liu , Xiaohong Xu , Yaqiang Shen , Deng Zhang","doi":"10.1016/j.ceramint.2025.03.125","DOIUrl":"10.1016/j.ceramint.2025.03.125","url":null,"abstract":"<div><div>The absorptivity of endothermic materials serves as a critical index for solar thermal power photothermal conversion systems, and ceramic-based endothermic materials characterized by high absorptivity also exhibit elevated sintering temperatures. In this study, CaF<sub>2</sub> was employed as an additive to investigate its effects on the physical properties and microstructure of the samples, with a particular focus on the mechanism by which CaF<sub>2</sub> reduces the sintering temperature of corundum-based endothermic ceramics. The results showed that the G2 sample (1 wt% CaF<sub>2</sub>), sintered at 1650 °C, displayed the best physical properties, including 93 % absorptivity, 165.43 MPa bending strength. The sintering temperature of the CaF<sub>2</sub>-doped G-series samples was around 60 °C lower due to liquid-phase calcium hexaaluminate formation from CaF<sub>2</sub> and Al<sub>2</sub>O<sub>3</sub>, which enhanced atomic migration and facilitated ceramic matrix sintering. Additionally, the capillary forces of the liquid-phase calcium hexaaluminate promoted ceramic matrix shrinkage and accelerated corundum-based grain growth through the dissolution-precipitation mechanism, leading to densification. Moreover, the G2 sample exhibited excellent durability, with absorptivity decreasing by only 1.9 % after 100 h at 1000 °C.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 18","pages":"Pages 24415-24428"},"PeriodicalIF":5.1,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144519260","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"SHS processes, structure and phase composition of hybrid compositional materials produced from (Al-Tiad)–(Ti-2B) system powder at different Tiad content","authors":"Aleksey Matveev , Vladimir Promakhov","doi":"10.1016/j.ceramint.2025.03.169","DOIUrl":"10.1016/j.ceramint.2025.03.169","url":null,"abstract":"<div><div>The paper studies processes of self-propagating high-temperature synthesis (SHS) in the (Al-Ti<sub>ad</sub>)–(Ti-2B) system powder and the structure and phase composition of the obtained hybrid compositional materials, depending on the content of additional titanium (Ti<sub>ad</sub>) introduced in the initial powder mix. It is shown that the higher Ti<sub>ad</sub> content leads to the temperature rise and more intensive SHS processes. The Ti<sub>ad</sub> content of 5, 10 and 30 wt% provides the formation of hybrid metal matrix composite Al–Al<sub>3</sub>Ti–TiB<sub>2</sub>. The content of Al<sub>3</sub>Ti phase in the SHS products increases with increasing Ti<sub>ad</sub> concentration in the initial powder mix, while the content of the aluminum matrix reduces. Further growth in the Ti<sub>ad</sub> content up to 50 wt% significantly modifies the phase composition of SHS products. The latter have no aluminum phase, but have new AlTi, cubic Al<sub>3</sub>Ti, and orthorhombic and cubic TiB phases. The paper proposes formation mechanisms of the structure and phase composition of synthesized hybrid metal matrix composites Al–Al<sub>3</sub>Ti–TiB<sub>2</sub>. It is supposed that these hybrid materials can be used as a hardening additive to the powder mix for the SHS products. Hardening additives can be utilized both in conventional powder metallurgy and selective laser sintering, selective laser melting. The best content of hybrid metal matrix composite Al–Al<sub>3</sub>Ti–TiB<sub>2</sub> added to the primary material, varies between 5 and 10 wt%. It is supposed that at such a concentration, the material plasticity lies within the tolerable limits; its strength, hardness, wear resistance, and oxidation stability being grown.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 18","pages":"Pages 24875-24883"},"PeriodicalIF":5.1,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144519263","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Tuning color and solar reflection performance for Cr doped YAlO3 red pigment by multiple ions co-doping based on defect engineering","authors":"Jian Zou, Yongpan Chen, Qin Yao","doi":"10.1016/j.ceramint.2025.03.185","DOIUrl":"10.1016/j.ceramint.2025.03.185","url":null,"abstract":"<div><div>This study presents a feasible approach to optimizing both the color and solar reflective properties of Cr-doped YAlO<sub>3</sub> red pigments by incorporating cerium (Ce) into the (Cr, Mg)-co-doped YAlO<sub>3</sub> matrix. The introduced Ce exists in the form of Ce<sup>3+</sup> and Ce<sup>4+</sup> ions, with the aliovalent substitution defect <span><math><mrow><mi>C</mi><msubsup><mi>e</mi><mi>Y</mi><mo>•</mo></msubsup></mrow></math></span> formed when Ce<sup>4+</sup> replaces Y<sup>3+</sup>.This substitution suppresses the generation of high-valence Cr ions, significantly enhancing the near-infrared (NIR) reflectance of the pigments. The observed dilution of the pigment's color upon Ce incorporation confirms that the coloration originates from high-valence Cr ions within the YAlO<sub>3</sub> lattice. By leveraging the crystal growth-promoting effect of sodium borate and synchronously adjusting the concentrations of various dopants, a red pigment with exceptional color performance was successfully synthesized. The red cool glaze coating formulated with this pigment demonstrates not only outstanding color attributes but also a high NIR reflectance value (<em>L∗</em> = 56.49, <em>a∗</em> = 34.58, <em>b∗</em> = 24.64, <em>R</em><sub><em>NIR</em></sub> = 94.78 %). In outdoor experiments designed to evaluate solar heat regulation, this ceramic glaze coating achieved a cooling effect of 10.6 °C lower than the coating prepared with commercial Fe<sub>2</sub>O<sub>3</sub> pigments.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 18","pages":"Pages 25033-25041"},"PeriodicalIF":5.1,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144519275","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Dario Rafael Manca , Hossein Najaf Zadeh , Daniel Bowles , Don Clucas , Matthew Watson
{"title":"Stencil additive manufacturing: An approach to fabricating porous 3D lattice alumina structures","authors":"Dario Rafael Manca , Hossein Najaf Zadeh , Daniel Bowles , Don Clucas , Matthew Watson","doi":"10.1016/j.ceramint.2025.03.299","DOIUrl":"10.1016/j.ceramint.2025.03.299","url":null,"abstract":"<div><div>This work employed the Stencil Additive Manufacturing (SAM) technique to fabricate α-alumina lattice structures. A ceramic slurry system based on Pluronic F-127 hydrogel was formulated to carry nano-sized α-alumina ceramic particles, achieving a solid loading of 37 vol%. The slurry exhibited non-Newtonian behaviour, making it suitable for stencil printing applications. Rheological characterisation revealed an elastic modulus of 19,600 kPa and a storage modulus of 996 kPa. Flow tests were successfully fitted to the Herschel-Bulkley model, yielding at 213.38 Pa, a flow index of 0.21, and a consistency index of 4259.24 Pa s, confirming the slurry's shear-thinning behaviour, an essential property for SAM. Stencil printing of ceramic hydrogel layers, followed by controlled drying and sintering at 1550 °C, resulted in the successful fabrication of rigid α-alumina ceramic parts. Post-sintering analysis demonstrated that crack-free specimens with heights up to 5.25 mm, maximum warping of 10 %, and 94–98 % density were achieved. The study highlights the potential of SAM for the additive manufacturing of ceramics, presenting a novel approach to fabricating complex ceramic structures. While the process shows promise, limitations such as channel closure during deposition and warping during drying must be addressed to further improve shape fidelity and accuracy. This research opens avenues for the future development of stencil-based additive manufacturing in ceramic production, which shows promise as a viable pathway to the mass manufacturing of parts.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 18","pages":"Pages 26156-26170"},"PeriodicalIF":5.1,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144522051","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}