Journal of The European Ceramic Society最新文献

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Perovskite–Aurivillius dielectric composites for high-temperature capacitors 高温电容器用钙钛矿-石英介电材料
IF 6.2 2区 材料科学
Journal of The European Ceramic Society Pub Date : 2025-08-28 DOI: 10.1016/j.jeurceramsoc.2025.117780
Ju Han , Byoung Uk Ahn , Jae Won Kwon , Kyeong Su Jo , Hong Je Choi , Yong Soo Cho
{"title":"Perovskite–Aurivillius dielectric composites for high-temperature capacitors","authors":"Ju Han ,&nbsp;Byoung Uk Ahn ,&nbsp;Jae Won Kwon ,&nbsp;Kyeong Su Jo ,&nbsp;Hong Je Choi ,&nbsp;Yong Soo Cho","doi":"10.1016/j.jeurceramsoc.2025.117780","DOIUrl":"10.1016/j.jeurceramsoc.2025.117780","url":null,"abstract":"<div><div>High-dielectric-constant <em>ε</em><sub><em>r</em></sub> materials with stable capacitances are required for high-temperature capacitive applications. This study introduces unconventional combinations of the perovskite BaTiO<sub>3</sub> with Aurivillius L<sub>n–3</sub>Bi<sub>4</sub>Ti<sub>n</sub>O<sub>3n+3</sub> (where L is Ca, Sr, or Ba, and <em>n</em> = 4, 5, or 6) phases as high-temperature, high-<em>ε</em><sub><em>r</em></sub> materials. The dielectric properties of the resulting composite materials strongly depended on the type and content of the Aurivillius phase. Compared with Ca<sub>n–3</sub>Bi<sub>4</sub>Ti<sub>n</sub>O<sub>3n+3</sub> or Sr<sub>n–3</sub>Bi<sub>4</sub>Ti<sub>n</sub>O<sub>3n+3</sub>, Ba<sub>n–3</sub>Bi<sub>4</sub>Ti<sub>n</sub>O<sub>3n+3</sub> more effectively stabilized the capacitance of the composites upon incorporation, particularly in the case of a lower <em>n</em>. For example, the capacitance of the BaTiO<sub>3</sub>–BaBi<sub>4</sub>Ti<sub>4</sub>O<sub>15</sub> with a molar ratio of 8:2 remained stable up to 444 °C within a capacitance change of only 20 %. The structural origin of the change in dielectric permittivity depending on the L cations and <em>n</em> value was explored in terms of the ionic radius and octahedral distortion.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"46 2","pages":"Article 117780"},"PeriodicalIF":6.2,"publicationDate":"2025-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144926421","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}
引用次数: 0
Integrated computational and experimental investigation of Groups V and VI metals in (M,Hf,Ti,Zr)B2-(M,Hf,Ti,Zr)C ceramics (M,Hf,Ti,Zr)B2-(M,Hf,Ti,Zr)C陶瓷中V族和VI族金属的综合计算和实验研究
IF 6.2 2区 材料科学
Journal of The European Ceramic Society Pub Date : 2025-08-27 DOI: 10.1016/j.jeurceramsoc.2025.117779
Ana C. Feltrin , Simon Divilov , Gregory E. Hilmas , Stefano Curtarolo , William G. Fahrenholtz
{"title":"Integrated computational and experimental investigation of Groups V and VI metals in (M,Hf,Ti,Zr)B2-(M,Hf,Ti,Zr)C ceramics","authors":"Ana C. Feltrin ,&nbsp;Simon Divilov ,&nbsp;Gregory E. Hilmas ,&nbsp;Stefano Curtarolo ,&nbsp;William G. Fahrenholtz","doi":"10.1016/j.jeurceramsoc.2025.117779","DOIUrl":"10.1016/j.jeurceramsoc.2025.117779","url":null,"abstract":"<div><div>Dual-phase compositionally complex ultra-high temperature ceramics were formulated by incorporating different Groups V and VI metals such as V, Nb, Ta, Cr, Mo, or W into a base composition containing the Group IV elements, Hf, Ti, and Zr. Metal distribution was predicted using first-principles-based thermodynamics simulations and compared with experimental results. Moreover, phase stability, microstructure, and mechanical properties were evaluated for all of the ceramics. Compositions containing Cr, V, Nb, or Ta formed dual-phase ceramics containing only one boride and one carbide phase, while compositions containing Mo or W developed an additional third phase. The experimental metal distribution trends generally aligned with thermodynamic predictions, except for compositions containing V, which showed unexpected segregation behavior that was influenced by complex interactions of the coexistence of boride and carbide structures. From the dual-phase ceramics, the composition containing V exhibited the highest hardness (HV<sub>1</sub> = 25.5 ± 0.6 GPa) combined with smaller grain sizes (0.99 ± 0.33 μm for the boride and 1.15 ± 0.31 μm for the carbide phases). Our findings provide insights into phase formation and elemental segregation and help the design of next-generation dual-phase UHTCs with tailored properties.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"46 2","pages":"Article 117779"},"PeriodicalIF":6.2,"publicationDate":"2025-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145004767","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}
引用次数: 0
Enhanced red emission in germanate glass-ceramics via controlled crystallization of Mn⁴⁺:K2Ge4O9 crystals with isolated [GeO6] octahedra 通过具有分离的[GeO6]八面体的Mn⁴+:K2Ge4O9晶体的控制结晶,增强了锗酸盐玻璃陶瓷中的红色发射
IF 6.2 2区 材料科学
Journal of The European Ceramic Society Pub Date : 2025-08-27 DOI: 10.1016/j.jeurceramsoc.2025.117778
Kai Chang , Jingyuan Liao , Zhaodong Zhang , Lingwei Zeng , Hong He , Guannan Li , Chunmei Li , Hua Lin , Jing Liu , Jianfeng Tang
{"title":"Enhanced red emission in germanate glass-ceramics via controlled crystallization of Mn⁴⁺:K2Ge4O9 crystals with isolated [GeO6] octahedra","authors":"Kai Chang ,&nbsp;Jingyuan Liao ,&nbsp;Zhaodong Zhang ,&nbsp;Lingwei Zeng ,&nbsp;Hong He ,&nbsp;Guannan Li ,&nbsp;Chunmei Li ,&nbsp;Hua Lin ,&nbsp;Jing Liu ,&nbsp;Jianfeng Tang","doi":"10.1016/j.jeurceramsoc.2025.117778","DOIUrl":"10.1016/j.jeurceramsoc.2025.117778","url":null,"abstract":"<div><div>Mn<sup>4+</sup>-activated luminescent materials are highly valued for their intense red emission. This study explores Mn<sup>4+</sup>-activated germanate glass-ceramics (GCs) made by in situ crystallization of a germanate parent glass. Controlled heat treatment enabled the sequential precipitation of two crystalline phases: Mn<sup>4+</sup>:K<sub>4</sub>Ge<sub>9</sub>O<sub>20</sub> (K4) and Mn<sup>4+</sup>:K<sub>2</sub>Ge<sub>4</sub>O<sub>9</sub> (K2). Mn<sup>4+</sup> ions favor six-fold coordinated Ge<sup>4+</sup> sites in these phases. The isolated trigonal-distorted [GeO<sub>6</sub>] octahedra in K2 enhance the <sup>2</sup>E → <sup>4</sup>A<sub>2</sub> emission intensity ten-fold compared to K4. Theoretical calculations indicate that Mn<sup>4+</sup> ions incorporation strengthens metal-ligand interaction and introduce new d-electron-related defect states within the forbidden band. The Mn<sup>4+</sup>:K2-embedded GC sample with 0.1 mol% Mn<sup>4+</sup> nominal concentration achieves optimal luminescence performance. It exhibits superior thermal stability compared to the Mn<sup>4+</sup>:K2 phosphor synthesized by solid-state reaction. These findings demonstrate the potential of Mn<sup>4+</sup>:K2-embedded germanate GC as an excellent red-emitting component for white LEDs, which can enhance indoor lighting quality by improving color rendering performance.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"46 2","pages":"Article 117778"},"PeriodicalIF":6.2,"publicationDate":"2025-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144912946","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}
引用次数: 0
3D printed glass-based biophotonic scaffolds for in situ activation of photoswitchable drugs 用于光开关药物原位激活的3D打印玻璃基生物光子支架
IF 6.2 2区 材料科学
Journal of The European Ceramic Society Pub Date : 2025-08-27 DOI: 10.1016/j.jeurceramsoc.2025.117777
Evellyn Santos Magalhães , Nirajan Ojha , Sonya Ghanavati , Ekin Opar , Philippe F. Smet , Mika Lastusaari , Fabio Riefolo , Carlo Matera , Jonathan Massera , Pau Gorostiza , Laeticia Petit
{"title":"3D printed glass-based biophotonic scaffolds for in situ activation of photoswitchable drugs","authors":"Evellyn Santos Magalhães ,&nbsp;Nirajan Ojha ,&nbsp;Sonya Ghanavati ,&nbsp;Ekin Opar ,&nbsp;Philippe F. Smet ,&nbsp;Mika Lastusaari ,&nbsp;Fabio Riefolo ,&nbsp;Carlo Matera ,&nbsp;Jonathan Massera ,&nbsp;Pau Gorostiza ,&nbsp;Laeticia Petit","doi":"10.1016/j.jeurceramsoc.2025.117777","DOIUrl":"10.1016/j.jeurceramsoc.2025.117777","url":null,"abstract":"<div><div>The fabrication of porous biophotonic scaffold using a robocasting is reported here. Such material could be used for in-situ activation of photoswitchable drugs, which is essential for improving therapeutic efficacy while minimizing side effects. The scaffold is made of a phosphate glass mixed with CaWO₄:Yb³ ⁺,Tm³ ⁺ crystals and SrAl₂O₄:Eu²⁺,Dy³ ⁺ phosphors. Upon 980 nm irradiation, the scaffold emits blue light and green afterglow, enabling in-situ activation post-implantation as NIR light penetrates tissue. The challenges related to the sintering process and its effect on the spectroscopic properties of the scaffold are discussed. The as-3D printed scaffold successfully enables one to activate the muscarinic photoswitchable drug Phthal Azobenzene Iperoxo (PAI) upon NIR excitation, confirming the potential for in-situ phototriggered delivery of drug action using tissue-permeable light stimulus.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"46 2","pages":"Article 117777"},"PeriodicalIF":6.2,"publicationDate":"2025-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144916781","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}
引用次数: 0
Contamination-free solid-state synthesis of BaZrO3 powder via sonochemical mixing of BaCO3 and ZrO2 BaCO3和ZrO2声化学混合无公害固态合成BaZrO3粉末
IF 6.2 2区 材料科学
Journal of The European Ceramic Society Pub Date : 2025-08-26 DOI: 10.1016/j.jeurceramsoc.2025.117774
Min Ho Jang , Won Yeong Chung , Ga Young Lee , Gil-Geun Lee , Young Soo Lim , Sungwon Yoon , Seok-Hyun Yoon
{"title":"Contamination-free solid-state synthesis of BaZrO3 powder via sonochemical mixing of BaCO3 and ZrO2","authors":"Min Ho Jang ,&nbsp;Won Yeong Chung ,&nbsp;Ga Young Lee ,&nbsp;Gil-Geun Lee ,&nbsp;Young Soo Lim ,&nbsp;Sungwon Yoon ,&nbsp;Seok-Hyun Yoon","doi":"10.1016/j.jeurceramsoc.2025.117774","DOIUrl":"10.1016/j.jeurceramsoc.2025.117774","url":null,"abstract":"<div><div>We present a comparative analysis of BaZrO<sub>3</sub> powders and ceramics synthesized through solid-state reactions, using stoichiometric mixtures of BaCO<sub>3</sub> and ZrO<sub>2</sub> prepared either by ball-milling (BM) or sonochemical (SC) mixing. BaZrO<sub>3</sub> powders synthesized through 5 min of sonochemical mixing exhibited properties nearly indistinguishable from those produced by 24 h of ball-milling and any potential Zr contamination from the collision between ZrO<sub>2</sub> balls and ZrO<sub>2</sub> raw powder could not be identified in the powder form. However, after sintering, clear differences were observed between BM and SC ceramics in terms of microstructure, dielectric properties, and electrical characteristics, all of which can be attributed to the effect of oxygen vacancy from Schottky defects, stemming from excess Zr contamination in the BM ceramic. Our results confirm that sonochemical mixing provides precise control over the designed composition in the solid-state synthesis of oxide powders, while saving the process time.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"46 2","pages":"Article 117774"},"PeriodicalIF":6.2,"publicationDate":"2025-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144912945","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}
引用次数: 0
Textured K0.5Na0.5NbO3 piezoelectric ceramics produced by vat photopolymerization-based additive manufacturing 基于还原光聚合的增材制造制备的K0.5Na0.5NbO3织构压电陶瓷
IF 6.2 2区 材料科学
Journal of The European Ceramic Society Pub Date : 2025-08-26 DOI: 10.1016/j.jeurceramsoc.2025.117776
Mahmoud Mobin , Oleg V. Mishin , Cenk Abdurrahmanoglu , Vincenzo Esposito , Astri Bjørnetun Haugen
{"title":"Textured K0.5Na0.5NbO3 piezoelectric ceramics produced by vat photopolymerization-based additive manufacturing","authors":"Mahmoud Mobin ,&nbsp;Oleg V. Mishin ,&nbsp;Cenk Abdurrahmanoglu ,&nbsp;Vincenzo Esposito ,&nbsp;Astri Bjørnetun Haugen","doi":"10.1016/j.jeurceramsoc.2025.117776","DOIUrl":"10.1016/j.jeurceramsoc.2025.117776","url":null,"abstract":"<div><div>Texturing of lead-free piezoelectric K<sub>0.5</sub>Na<sub>0.5</sub>NbO<sub>3</sub> (KNN) has gained significant interest due to increased piezoelectric response along 〈100〉<sub>pc</sub> directions. However, conventional processing methods used for texturing are limited to simple geometries. Additive manufacturing (AM), commonly referred to as 3D printing, presents a promising alternative, capable of producing intricate shapes with enhanced electromechanical properties and extended functionalities that are difficult or impossible to achieve through traditional methods. This study establishes the fabrication of textured KNN ceramics using blade-assisted bottom-up vat photopolymerization (VPP)-based AM in conjunction with heteroepitaxial templated grain growth. The textured KNN fabricated via VPP demonstrates a strong 〈100〉<sub>pc</sub> texture with a Lotgering factor of 96 %, comparable to what is commonly obtained by conventional tape casting and close to the highest Lotgering factor reported for any ceramics textured through AM. The piezoelectric performance of the textured KNN sample produced through VPP shows a 77 % increase compared to untextured KNN.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"46 1","pages":"Article 117776"},"PeriodicalIF":6.2,"publicationDate":"2025-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144909075","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}
引用次数: 0
Combined effects of graphene nanoplatelet and zirconium diboride additions on spark plasma sintered boron carbide composites with square geometry 石墨烯纳米板和二硼化锆对火花等离子烧结方形碳化硼复合材料的复合效应
IF 6.2 2区 材料科学
Journal of The European Ceramic Society Pub Date : 2025-08-25 DOI: 10.1016/j.jeurceramsoc.2025.117773
Behrad Mokhtari, Leyla Yanmaz, Demet Aydogmus, Berkay Uygun, Filiz Cinar Sahin
{"title":"Combined effects of graphene nanoplatelet and zirconium diboride additions on spark plasma sintered boron carbide composites with square geometry","authors":"Behrad Mokhtari,&nbsp;Leyla Yanmaz,&nbsp;Demet Aydogmus,&nbsp;Berkay Uygun,&nbsp;Filiz Cinar Sahin","doi":"10.1016/j.jeurceramsoc.2025.117773","DOIUrl":"10.1016/j.jeurceramsoc.2025.117773","url":null,"abstract":"<div><div>In the present work, graphene nanoplatelets (GNPs) in varying amounts (1, 2, and 3 vol%) were incorporated into B<sub>4</sub>C composite powders containing 5 and 15 vol% ZrB<sub>2</sub>. The square-shaped composites were produced by spark plasma sintering (SPS) at 1540°C under 50 MPa with a 7 min holding time. The effects of GNP addition on the densification behavior, homogeneity, mechanical properties, and microstructure of the composites were evaluated. The results showed that adding GNPs into the B<sub>4</sub>C-ZrB<sub>2</sub> matrix enhanced the relative density and improved the homogeneity across different sections (center, edge, corner) of the square-shaped composites. Composites containing 15 vol% ZrB<sub>2</sub> and 1 vol% GNP demonstrated optimal performance with relative density, hardness, and fracture toughness of ∼99.5 %, 34.76 GPa, and 4.15 MPa.m<sup>1/2</sup>, respectively. Moreover, crack deflection, branching, and bridging were identified as primary toughening mechanisms.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"46 1","pages":"Article 117773"},"PeriodicalIF":6.2,"publicationDate":"2025-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144909074","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}
引用次数: 0
Q factor enhancement in Nd2Zr3(MoO4)9 microwave ceramics via B-site (Bi0.5Ta0.5)4 + substitution and low-temperature sintering 通过b位(Bi0.5Ta0.5)4 +取代和低温烧结增强Nd2Zr3(MoO4)9微波陶瓷的Q因子
IF 6.2 2区 材料科学
Journal of The European Ceramic Society Pub Date : 2025-08-24 DOI: 10.1016/j.jeurceramsoc.2025.117771
Yuan-Bin Chen, Ling Tang, Xiuyuan Su
{"title":"Q factor enhancement in Nd2Zr3(MoO4)9 microwave ceramics via B-site (Bi0.5Ta0.5)4 + substitution and low-temperature sintering","authors":"Yuan-Bin Chen,&nbsp;Ling Tang,&nbsp;Xiuyuan Su","doi":"10.1016/j.jeurceramsoc.2025.117771","DOIUrl":"10.1016/j.jeurceramsoc.2025.117771","url":null,"abstract":"<div><div>Low-temperature sintered microwave dielectric ceramics are gaining increasing attention for next-generation wireless communication systems, particularly within the 6 G frequency range. However, materials that simultaneously exhibit ultra-low dielectric loss and low sintering temperatures remain scarce. In this study, Nd<sub>2</sub>[Zr<sub>1-X</sub>(Bi<sub>0.5</sub>Ta<sub>0.5</sub>)<sub>X</sub>]<sub>3</sub>(MoO<sub>4</sub>)<sub>9</sub> ceramics were prepared via a conventional solid-state reaction method and exhibited a single-phase structure with a trigonal symmetry (space group R<span><math><mover><mn>3</mn><mo>¯</mo></mover></math></span>C, No. 167). The optimal sample at x = 0.11 sintered at 750 ℃ showed excellent performance: ε<sub>r</sub> = 11.4, Q×f = 186,300 ± 8900 GHz, and τ<sub>f</sub> = –42.9 ppm/℃. The elevated Q×f value is chiefly ascribed to increased lattice energy, with its variation more plausibly arising from intrinsic effects within the material. The dielectric constant (εᵣ), analyzed using the Clausius–Mosotti equation, was predominantly influenced by ionic polarizability. According to P–V–L theory, the effective bond strength f<sub>iNd–O</sub> played a major role in determining εᵣ, while τ<sub>f</sub> was governed by the bond energy and thermal expansion behavior of Mo–O bonds. Raman spectroscopy further confirmed the structure–property relationships. These results suggest that B-site substitution with (Bi<sub>0.5</sub>Ta<sub>0.5</sub>)<sup>4+</sup> not only promotes densification and increases lattice energy, but also maintains thermal stability, thereby enhancing Q×f without compromising τ<sub>f</sub>. This system offers strong potential for integration into future microwave dielectric components.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"46 2","pages":"Article 117771"},"PeriodicalIF":6.2,"publicationDate":"2025-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144997242","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}
引用次数: 0
Phase transformation and densification of cBN-Y2O3 nanocomposites by high pressure and high temperature cBN-Y2O3纳米复合材料高压高温相变致密化研究
IF 6.2 2区 材料科学
Journal of The European Ceramic Society Pub Date : 2025-08-23 DOI: 10.1016/j.jeurceramsoc.2025.117770
Jiao Li , Piotr Klimczyk , Yuliia Rumiantseva , Yiquan Wu
{"title":"Phase transformation and densification of cBN-Y2O3 nanocomposites by high pressure and high temperature","authors":"Jiao Li ,&nbsp;Piotr Klimczyk ,&nbsp;Yuliia Rumiantseva ,&nbsp;Yiquan Wu","doi":"10.1016/j.jeurceramsoc.2025.117770","DOIUrl":"10.1016/j.jeurceramsoc.2025.117770","url":null,"abstract":"<div><div>Composite cBN- Y<sub>2</sub>O<sub>3</sub> ceramics with a 30 vol% cBN content were successfully fabricated at sintering temperature ranging from 800 to 1600 °C under a high pressure of 7.2 GPa. The high sintering pressure was observed to prevent phase transformation of cubic BN phase, while simultaneously inducing the transformation from cubic Y<sub>2</sub>O<sub>3</sub> to monoclinic Y<sub>2</sub>O<sub>3</sub> phase. No significant change in the grain size of cBN within the composites was observed, attributed to the low sintering temperatures and short holding time. In contrast, the grain size of Y<sub>2</sub>O<sub>3</sub> within the cBN- Y<sub>2</sub>O<sub>3</sub> composite was reduced to less than 100 nm after sintering at 800 and 1000 °C. This observation indicates that the high pressure-induced phase transformation of Y<sub>2</sub>O<sub>3</sub>contributed to its grain refinement. As a result of the retained cubic BN phase and refined Y<sub>2</sub>O<sub>3</sub> grains, the cBN- Y<sub>2</sub>O<sub>3</sub> composite ceramics sintered for 60 s achieved a relative density of 94 % and a hardness of approximately 11 GPa. These results demonstrated that the high pressure and high temperature (HPHT) technique is a promising route in achieving fully dense cBN-Y<sub>2</sub>O<sub>3</sub> composite ceramics with enhanced performance.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"46 2","pages":"Article 117770"},"PeriodicalIF":6.2,"publicationDate":"2025-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144933596","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}
引用次数: 0
Activation and cold sintering of commercial ZnO powders: Compaction-induced oxide reduction 商用氧化锌粉末的活化和冷烧结:压实诱导的氧化物还原
IF 6.2 2区 材料科学
Journal of The European Ceramic Society Pub Date : 2025-08-21 DOI: 10.1016/j.jeurceramsoc.2025.117769
Korbinian Aicher, Thomas Berger, Ulrich Aschauer, Oliver Diwald
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