Xuejin Zhang , Shibo Li , Weiwei Zhang , Guoping Bei
{"title":"Recent progress in preparation, microstructure and properties of Cr2AlC MAX phase coatings","authors":"Xuejin Zhang , Shibo Li , Weiwei Zhang , Guoping Bei","doi":"10.1016/j.jeurceramsoc.2025.117555","DOIUrl":"10.1016/j.jeurceramsoc.2025.117555","url":null,"abstract":"<div><div>MAX phase coatings have attracted much attention because of their functional and comprehensive properties which can meet requirements in modern industry. As an attractive member of the MAX phase family, Cr<sub>2</sub>AlC can be used as a protection coating in aerospace, automotive manufacturing, high-temperature equipment, nuclear reactors, etc., due to its excellent mechanical properties, remarkable resistance to oxidation, corrosion, and thermal shock, and good anti-wear behavior. Here, we present an overview of the advances in Cr<sub>2</sub>AlC coatings developed in recent decades, covering preparation techniques, influencing factors, and microstructure characterizations. In addition, the influences of microstructure on mechanical properties, oxidation resistance, and corrosion resistance are discussed. This review provides a guide for correctly making decisions how to design and prepare a desirable Cr<sub>2</sub>AlC coating, and also promotes its practical applications in various fields.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 14","pages":"Article 117555"},"PeriodicalIF":5.8,"publicationDate":"2025-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144124861","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}
Avnee Chauhan , Andreas Frickel , Kousik Papakollu , Sabine Begand , Mathias Herrmann , Enrico Bernardo , Dušan Galusek
{"title":"Polymorphic transitions and phase stability of CeO2-δ·(Dy,La,Sm,Y)2O3 high-entropy oxides consolidated by spark plasma sintering","authors":"Avnee Chauhan , Andreas Frickel , Kousik Papakollu , Sabine Begand , Mathias Herrmann , Enrico Bernardo , Dušan Galusek","doi":"10.1016/j.jeurceramsoc.2025.117552","DOIUrl":"10.1016/j.jeurceramsoc.2025.117552","url":null,"abstract":"<div><div>The influence of spark plasma sintering (SPS) on the phase stability and bandgap of single-phase HEO ceramics with the composition CeO<sub>2-δ</sub>·(Dy,La,Sm,Y)<sub>2</sub>O<sub>3</sub> was studied. Single phase HEO powders were prepared by combustion synthesis. The powders were consolidated by SPS at temperatures 1300° C, 1400° C, and 1600° C to prepare dense bulk ceramics. At 1600° C, a complete cubic-to-monoclinic phase transformation occurred, driven by Ce<sup>4 +</sup> to Ce<sup>3+</sup> reduction under reducing SPS conditions. The change in the oxidation state of Ce resulted in an increase of the average ionic radius driving the cubic-to-monoclinic phase transition. Annealing the monoclinic samples at 1200° C in air led to a reversible transformation to the cubic structure. The phase transformations coupled with the presence of oxygen vacancies resulted in a bandgap energy reduction.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 14","pages":"Article 117552"},"PeriodicalIF":5.8,"publicationDate":"2025-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144124865","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":"A new interpretation on the recipe and technological origin of 14–18th century Chinese copper red paint","authors":"Yizheng Zhang , Hongjiao Ma , Yanjun Weng , Xianping Gao , Yuting Tong , Wei Qian","doi":"10.1016/j.jeurceramsoc.2025.117535","DOIUrl":"10.1016/j.jeurceramsoc.2025.117535","url":null,"abstract":"<div><div>Despite the survival of sophisticated technique of underglaze copper red porcelain in contemporary China, the historical recipe for this paint from the Yuan to Qing dynasty (14–18th century) remains unknown. In this study, analytical methods such as scanning electron microscopy with energy dispersive spectroscopy (SEM-EDS), electron probe microanalysis with wavelength dispersive X-ray spectroscopy (EPMA-WDS), and laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) were used to examine twenty-seven underglaze copper red and partial copper red glaze samples. The detection of Cu-S and Cu-As phases in microscale particles in the red colour areas reveals that cupric oxide and realgar were the primary raw materials. The use of realgar and other pertinent evidence indicate that the development of underglaze copper red in the Yuan dynasty was influenced by Islamic ceramic. This research provides insights into the technological origins and historical recipe of the underglaze copper red porcelain and highlights potential technological links between Chinese and West Asian ceramics during the Yuan dynasty.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 14","pages":"Article 117535"},"PeriodicalIF":5.8,"publicationDate":"2025-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144139149","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}
Julien De Landtsheer , Thomas Hérisson de Beauvoir , Alicia Weibel , Geoffroy Chevallier , Erica Roitero , Laetitia Etienne , U.-Chan Chung , Matthew R. Suchomel , Graziella Goglio , Gilles Philippot , Catherine Elissalde , Claude Estournès
{"title":"Low temperature reactive spark plasma sintering of yttria-stabilized zirconia from mixture of hydroxides","authors":"Julien De Landtsheer , Thomas Hérisson de Beauvoir , Alicia Weibel , Geoffroy Chevallier , Erica Roitero , Laetitia Etienne , U.-Chan Chung , Matthew R. Suchomel , Graziella Goglio , Gilles Philippot , Catherine Elissalde , Claude Estournès","doi":"10.1016/j.jeurceramsoc.2025.117554","DOIUrl":"10.1016/j.jeurceramsoc.2025.117554","url":null,"abstract":"<div><div>This work explores the low-temperature (≤ 1000 °C) densification of Yttria-Stabilized Zirconia (YSZ) using reactive hydroxide precursors. A density of 97 % was achieved by Spark Plasma Sintering (SPS) at only 100 MPa, enabled the high reactivity of a mixture of Y(OH)<sub>3</sub> and Zr(OH)<sub>4</sub>. This reactivity was investigated under two conditions: a) in air, using thermal analyses (TGA, DSC) and in situ high temperature X-ray diffraction (HT-XRD), and b) under vacuum within a SPS device, through degassing analysis and ex-situ XRD. Differences in crystallinity according to the environment and identification of the optimal reactivity window were determined for Y(OH)<sub>3</sub> and the hydroxide mixture, in order to determine the SPS conditions to trigger low-temperature densification. The use of SPS combined with specific amorphous hydroxide precursors, exhibiting greater reactivity than their crystalline counterparts, afforded the formation of YSZ at relatively low temperatures (350°C) and very high densification at only 1000°C.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 14","pages":"Article 117554"},"PeriodicalIF":5.8,"publicationDate":"2025-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144116778","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":"In-situ reaction between SiC whiskers and sintering additives to strengthen and toughen SiC ceramic","authors":"Feng Mao, Xiaoxin Zhang, Qingzhi Yan","doi":"10.1016/j.jeurceramsoc.2025.117553","DOIUrl":"10.1016/j.jeurceramsoc.2025.117553","url":null,"abstract":"<div><div>The application scope of advanced ceramics is significantly limited due to their inherent brittleness, making the enhancement of fracture toughness a critical area of research. Although the incorporation of SiC whiskers (SiCw) has been shown to effectively improve fracture toughness, a high content of whiskers complicates the densification process. Herein, we discovered that the addition of SiCw can react in-situ with sintering additives, enabling SiC ceramics to achieve densification while incorporating a substantial quantity of whiskers. We systematically investigated the effects of stacking faults in SiC whiskers on the densification and microstructure of ceramics. SiCw with stacking faults reacted with sintering additives, leading to improved densification and refined grains. In contrast, whiskers without stacking faults maintained a rod-like structure within the ceramic matrix, resulting in whisker debonding and pull-out. When 40 vol.% SiCw was added, the optimized flexural strength and fracture toughness can reach 885 MPa and 8.94 MPa·m<sup>0.5</sup>, respectively.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 15","pages":"Article 117553"},"PeriodicalIF":5.8,"publicationDate":"2025-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144189895","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}
D. Huang , J. Wang , Y.S. Niu , S. Li , Z.B. Bao , S.L. Zhu , F.H. Wang
{"title":"Abnormal failures of CMAS corrosion on suspension plasma sprayed thermal barrier coatings based on β-(Ni,Pt)Al bondcoat at 1300 °C","authors":"D. Huang , J. Wang , Y.S. Niu , S. Li , Z.B. Bao , S.L. Zhu , F.H. Wang","doi":"10.1016/j.jeurceramsoc.2025.117548","DOIUrl":"10.1016/j.jeurceramsoc.2025.117548","url":null,"abstract":"<div><div>Vertical-cracked and columnar topcoats were deposited on β-(Ni,Pt)Al bondcoats by suspension plasma spray with 6–8 wt% yttria-stabilized zirconia. Then, the as-sprayed samples were subjected to CMAS corrosion tests at 1300 °C. Results showed that the peeled-off phenomenon is the main factor in failure of vertical-cracked topcoats, while columnar topcoats preserved their integrity. The primary factor contributing to this disparity is the anisotropic fracture toughness in columnar topcoats, which facilitates the occurrence of out-of-plane cracks and expedites the infiltration of CMAS molten. Consequently, it effectively prevents the peeled-off phenomenon and reduces the relative amount of CMAS molten on YSZ during corrosion.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 14","pages":"Article 117548"},"PeriodicalIF":5.8,"publicationDate":"2025-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144107260","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}
Yan Wang , Haohao Ji , Dewen Wang , Shunzo Shimai , Xiaojian Mao , Jian Zhang , Shiwei Wang
{"title":"Coupled roles of MgF2 additive on sintering of sub-micron alumina transparent ceramics","authors":"Yan Wang , Haohao Ji , Dewen Wang , Shunzo Shimai , Xiaojian Mao , Jian Zhang , Shiwei Wang","doi":"10.1016/j.jeurceramsoc.2025.117547","DOIUrl":"10.1016/j.jeurceramsoc.2025.117547","url":null,"abstract":"<div><div>High-quality transparent Al<sub>2</sub>O<sub>3</sub> ceramics were successfully prepared using MgF<sub>2</sub> as a sintering additive. Comprehensive investigations involving microstructure characterization, optical/mechanical properties, and sintering kinetics analysis found that F anions play a dominant role in enhancing densification with slight effects on grain size. While Mg cations primarily suppress grain growth through solute drag effects. Significantly, the combining functions of Mg and F confer MgF<sub>2</sub> remarkable superiority over both conventional spinel and AlF<sub>3</sub> additives upon the preparation of transparent Al<sub>2</sub>O<sub>3</sub> ceramics. Consequently, MgF<sub>2</sub>-doped Al<sub>2</sub>O<sub>3</sub> ceramics with the optimum dopant content (500 ppm) present the highest in-line transmittance of 61.6 % at 640 nm alongside superior mechanical properties (hardness of 21.8 GPa, indentation fracture toughness of 2.73 MPa·m<sup>1/2</sup>). By elucidating the coupled sintering roles of Mg-F pair, this work provides a novel paradigm for designing dual-functional additives in transparent Al<sub>2</sub>O<sub>3</sub> ceramics.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 14","pages":"Article 117547"},"PeriodicalIF":5.8,"publicationDate":"2025-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144124866","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":"Modified calibration of m-ZrO2 fraction transformed from t-ZrO2 on low-temperature degradation of dental zirconia","authors":"Dae-Joon Kim , Choong-Ki Lee","doi":"10.1016/j.jeurceramsoc.2025.117541","DOIUrl":"10.1016/j.jeurceramsoc.2025.117541","url":null,"abstract":"<div><div>This study examines the phase evolution in the low-temperature degradation (LTD) of 3 mol% Y<sub>2</sub>O<sub>3</sub>-stabilized zirconia (3YSZ) in air, establishing a correlation between LTD extents determined using Rietveld refinement and the traditional Garvie and Nicholson method. Fifty-nine 3YSZ specimens were sintered at 1500–1650 °C for 2–20 h and subsequently aged in air at 130–220 °C for up to 20 h. Phase analysis confirms the presence of multiple ZrO<sub>2</sub> polymorphs in 3YSZ, including monoclinic (m), tetragonal (t), tetragonal non-transformable-to-m (t″), cubic (c), and rhombohedral (r) phases, and a minor content of Y<sub>4</sub>Zr<sub>3</sub>O<sub>12</sub>. LTD is primarily associated with the t″→r transformation, induced by compressive strain at grain boundaries, which disrupts the coherency between t- and c-ZrO<sub>2</sub>, ultimately triggering the t→m phase transformation. This process is attributed to the 2.0 % volume expansion accompanying t″→r, imposing tensile strain on the t-ZrO<sub>2</sub> lattice. The resulting strain, along with the tensile strain induced by thermal expansion anisotropy, likely facilitates the migration of oxygen vacancies from Zr<sup>4 +</sup> to Y<sup>3+</sup> nearest-neighbor sites, leading to oxygen ion overcrowding around Zr<sup>4+</sup> and contributing to the destabilization of t-ZrO<sub>2</sub>. During LTD, a systematic decrease in t- and t″-phase content was observed alongside an increase in m- and r-ZrO<sub>2</sub> content, underscoring a strong correlation between LTD extent, measured as the weight fraction phase ratio m/(m + t) through Rietveld refinement, and the ratio m/(m + t + t″ + c + r) determined using the Garvie and Nicholson method. Based on this correlation, a calibration equation is proposed to convert LTD extents obtained using the traditional method into those derived through Rietveld refinement, simplifying the complexity of Rietveld analysis.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 14","pages":"Article 117541"},"PeriodicalIF":5.8,"publicationDate":"2025-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144124863","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}
Harry Charalambous , Maxwell H. Jancich , Peter W.F. Evans , Jesus Rivera , James T. Cahill , Wyatt L. Du Frane , Joshua D. Kuntz , Bruce Yang
{"title":"Low oxygen transparency of Hf6Ta2O17 and homologous ZrxTa2O2x+5 series revealed by electrochemical impedance spectroscopy","authors":"Harry Charalambous , Maxwell H. Jancich , Peter W.F. Evans , Jesus Rivera , James T. Cahill , Wyatt L. Du Frane , Joshua D. Kuntz , Bruce Yang","doi":"10.1016/j.jeurceramsoc.2025.117549","DOIUrl":"10.1016/j.jeurceramsoc.2025.117549","url":null,"abstract":"<div><div>Hf<sub>6</sub>Ta<sub>2</sub>O<sub>17</sub> and Zr<sub>6</sub>Ta<sub>2</sub>O<sub>17</sub> are promising thermal barrier coating (TBC) candidates due to their high melting points and low oxygen diffusivity. Electrochemical impedance spectroscopy was used to study dielectric and ionic properties of these materials, with higher measurement temperatures required and no clear distinction between the bulk and grain boundaries. Activation energies for oxygen diffusion were determined from Arrhenius plots of the measured conductivities: 1.76–1.89 eV for the Zr<sub>x</sub>Ta<sub>2</sub>O<sub>2x+5</sub> (x = 5, 6, 7, 8) homologous series and 2.26 eV for Hf<sub>6</sub>Ta<sub>2</sub>O<sub>17</sub>. Frequency mismatch between the peak imaginary impedance and peak imaginary modulus points to a local relaxation process as the dominant mode of charge transfer rather than a long-range (vacancy migration) mode. A table of activation energies for various TBC ceramics and these materials are presented. Hf<sub>6</sub>Ta<sub>2</sub>O<sub>17</sub> and Zr<sub>6</sub>Ta<sub>2</sub>O<sub>17</sub> are verified to be effective oxygen barriers protecting underlying substrates from oxidative corrosion at high temperatures.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 14","pages":"Article 117549"},"PeriodicalIF":5.8,"publicationDate":"2025-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144107259","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}
Tianxiao Hu , Mengting Lin , Ji Zou , Weimin Wang , Wei Ji , Zhengyi Fu
{"title":"Pressure-controlled synergy between dehydrogenation and densification in TiH2 sintering","authors":"Tianxiao Hu , Mengting Lin , Ji Zou , Weimin Wang , Wei Ji , Zhengyi Fu","doi":"10.1016/j.jeurceramsoc.2025.117551","DOIUrl":"10.1016/j.jeurceramsoc.2025.117551","url":null,"abstract":"<div><div>Titanium hydride (TiH<sub>2</sub>) ceramics have become key high-performance hydrogen storage materials. However, the sintering of TiH<sub>2</sub> faces significant challenges due to the low temperature of dehydrogenation reaction (300–800 °C). In this study, high-pressure spark plasma sintering (HPSPS) technique was employed to successfully realize low-temperature high-density preparation by suppressing dehydrogenation and regulating densification kinetics under a high pressure (200 MPa). Under the optimized conditions (750 °C, 200 MPa, and 10 min), a fully dense single face-centered cubic (FCC) δ-Ti(H) phase bulk material was fabricated. The initial dehydrogenation temperature of samples fabricated by high-pressure spark plasma sintering (HPSPS) was higher than the dehydrogenation temperature of powder. Mechanistic analyses showed that high pressure inhibited hydrogen escape by compressing pores while promoting particle plastic flow and interfacial bonding. Increasing holding time from 5 to 10 min enhanced diffusion-dominated densification but exacerbated dehydrogenation-induced porosity under low-pressure conditions. The study shows that high pressure compaction can alleviate the contradiction between traditional high temperature densification and low temperature decomposition of TiH<sub>2</sub>, and offers a new strategy for the efficient densification of materials for low temperature decomposition.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 14","pages":"Article 117551"},"PeriodicalIF":5.8,"publicationDate":"2025-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144107257","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}