Journal of the American Ceramic Society最新文献

{"title":"Fabrication and characterization of foamed ceramics with a hierarchical pore structure from pyrite-rich cyanide tailing","authors":"Xuexiang Ge,&nbsp;Maoxiang Niu,&nbsp;Yonggang Dai,&nbsp;Xing Jin,&nbsp;Qingping Wang,&nbsp;Ying Zhang","doi":"10.1111/jace.20234","DOIUrl":"https://doi.org/10.1111/jace.20234","url":null,"abstract":"<p>In this study, foamed ceramics with hierarchical closed-cell pore structures (HPS-FC) were successfully prepared using pyrite-rich cyanide tailing (CT) and fly ash. The formation mechanism of the hierarchical pore structure was analyzed by investigating the influence of the heating rate on both the pore structure and the physical properties of foamed ceramics. The results demonstrate that CT is suitable for the preparation of foamed ceramics due to its low softening temperature and self-expansion capability at high temperatures. Interestingly, the heating rate significantly affects the pore structure of foamed ceramics prepared from CT. As the heating rate increases from 1 to 4°C/min, a hierarchical pore structure emerges, characterized by gradual alterations in bulk density, compressive strength, and thermal conductivity within the foamed ceramics. Whereas, excessive heating rates (≥6°C/min) result in the generation of abnormally large pores, which deteriorate the mechanical properties of foamed ceramics. The oxidation of FeS₂ from CT consumes a large amount of oxygen during heating, which is the primary reason for the formation of the hierarchical pore structure. Therefore, HPS-FC can be produced from CT by adjusting the heating rate, which combines high strength with good thermal insulation and demonstrates promising applications in prefabricated buildings.</p>","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"108 2","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142762761","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Reversible photochromism and photoluminescence modulation in (K,Na)NbO3-based ceramics via oxygen vacancy regulation","authors":"Bin Yang,&nbsp;Tao Zhang,&nbsp;Hejin Zhang,&nbsp;Muhammad Sultan Irshad,&nbsp;Jinming Guo","doi":"10.1111/jace.20224","DOIUrl":"https://doi.org/10.1111/jace.20224","url":null,"abstract":"<p>Most of the optical behaviors in photoelectric multifunctional ceramics strongly depend on the addition of rare-earth elements. However, the limited species of rare-earth cations available as luminescence centers restrict the further development of photoelectric devices. Additionally, introducing the large atomic-radii elements usually dramatically deteriorates the piezoelectric properties. Herein, the novel photochromism and luminescence modulation properties have been realized in CuO-doped [(K_0.43Na_0.57)_0.94Li_0.06][(Nb_0.94Sb_0.06)_0.95Ta_0.05]O₃ (KNLNST) piezoelectric ceramics which show intense sensitivity to visible-light irradiation. As a strategy for regulating oxygen vacancy concentrations in piezoelectric ceramics, different CuO amounts are doped to generate color centers for photochromism. The photoluminescence phenomenon exhibiting green emission under 375 nm excitation is observed in KNLNST piezoelectric ceramics, which is most commonly realized via rare-earth doping in luminescent materials. KNLNST–0.3CuO ceramics with the highest oxygen vacancy concentration achieve a reversible luminescence modulation of 46.9% by altering light irradiation and thermal stimulus. Moreover, a hand-rewritable optical information test demonstrates exceptional reproducibility and fatigue durability. This research displays the controllable photochromism and luminescence behaviors in ceramics via regulating oxygen vacancy concentration by CuO “hard” doping. The lead-free high performance photoelectric ceramics fulfill the demands of potential applications in anti-counterfeiting and optical storage devices.</p>","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"108 2","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142762624","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of pressure on the sintering mechanisms of tantalum carbide ceramics","authors":"Junfeng Gu,&nbsp;Peiyan Ma,&nbsp;Hao Wang,&nbsp;Weimin Wang,&nbsp;Zhengyi Fu","doi":"10.1111/jace.20227","DOIUrl":"https://doi.org/10.1111/jace.20227","url":null,"abstract":"<p>High pressure sintering shows great superiority in promoting the densification of the hard-to-densify refractory ceramics, and the underlying mechanisms are thus of great interest. In the present work, the densification process of tantalum carbide (TaC) ceramics affected by pressure was discussed through comparing the microstructural characteristics and sintering kinetics. The TaC ceramics sintered at 30–250 MPa show dense and uniform microstructure without oxide impurities and high-density dislocations. With the increase of sintering pressure, particle rearrangement becomes prominent at initial stage, whereas grain boundary diffusion rather than lattice diffusion dominants the final stage mechanism. Grain growth is enhanced under high pressure through the plastic deformation process. Our work should facilitate to understand the mass transport mechanisms during the high pressure sintering or deformation process of carbide ceramics.</p>","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"108 2","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142762622","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"β-Cristobalite thermal expansion and stability in environmental barrier coating systems","authors":"Jamesa L. Stokes","doi":"10.1111/jace.20214","DOIUrl":"https://doi.org/10.1111/jace.20214","url":null,"abstract":"<p>SiC-based ceramic matrix composites (CMCs) for turbine engine applications require environmental barrier coatings (EBCs) to protect against water-vapor induced corrosion. A significant limiting factor of EBC operating lifetime is the formation of a SiO₂ thermally grown oxide (TGO) at the EBC–CMC interface at high temperature. Its rapid growth as well as displacive β→α cristobalite phase transformation upon cooling induces strains at this interface, which can result in coating spallation. Recent work has explored upon the use of modifier oxides in EBCs to reduce oxidizing specie transport and possibly stabilize the SiO₂ TGO. This work utilizes EBC–glass mixtures to characterize the properties of modifier-stabilized SiO₂ and assess its impact in future EBC systems.</p>","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"108 2","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142762623","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Reactive sintered dense carbon fiber reinforced high-entropy boride composite using high-entropy silicide as reactant","authors":"Feilong Huang,&nbsp;Hailong Wang,&nbsp;Cheng Fang,&nbsp;Jiayin Zhao,&nbsp;Kaize Zheng,&nbsp;Bo Song,&nbsp;Wei Xie,&nbsp;Mingliang Li,&nbsp;Hongxia Lu","doi":"10.1111/jace.20212","DOIUrl":"https://doi.org/10.1111/jace.20212","url":null,"abstract":"<p>A novel reactive sintering strategy using high-entropy disilicide, B₄C, and carbon as initial materials is developed to fabricate dense carbon fiber reinforced high-entropy diboride (HEB)-based composite (C_f/HEBs) at a relatively low temperature. The C_f/(V_0.2Nb_0.2Cr_0.2Mo_0.2W_0.2)B₂–SiC composite (C_f/HEB–SiC) successfully achieves nearly full densification (with a relative density of 99.2%) at 1800°C. The reactive damage of carbon fibers can be effectively restrained by preassemble carbon coating during the preparation process of the composite. Lower preparation temperature and effective coating protection contribute to the exertion of carbon fibers toughening capacity, consequently noticeably elevating the critical crack size (<i>α</i>_cr) from 27.7 µm for HEB–SiC to 110.4 µm for C_f/HEB–SiC. The current work provides a feasible way to substantially upgrade the damage tolerance of HEB–SiC and can be extended to other HEBs-based ceramics.</p>","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"108 2","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142762625","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Misorientations across interfaces in spark plasma–sintered WC–Co cemented carbides","authors":"Xiaokun Yuan,&nbsp;Shixian Zhao,&nbsp;Chongbin Wei,&nbsp;Xingwei Liu","doi":"10.1111/jace.20218","DOIUrl":"https://doi.org/10.1111/jace.20218","url":null,"abstract":"<p>This interdisciplinary work concerns misorientations across various interfaces in spark plasma–sintered (SPSed) WC–Co cemented carbides, as well as how these misorientations affect the intergranular fracture. The whole boundaries in cemented carbides were divided according to the phases on the two sides of the boundary plane, and carbide/carbide grain boundaries were further divided according to the misorientation across the boundary plane. Stereological statistics and five-parameter analysis were comprehensively performed on the concerned boundary types. For Σ2 carbide/carbide boundaries, multiple boundary structures are observed. How Σ2 twist inhibits intergranular fracture and how such boundary structure is formed are analyzed. For random carbide/carbide boundaries, the habit planes that they are terminated by are calibrated, and their responses to intergranular fracture are examined according to their energy anisotropy. For WC/α-cobalt and WC/β-cobalt phase boundaries, misorientations across these boundary planes and the corresponding crack propagation routines are illustrated. On these bases, approaches to improve the fracture strength of SPSed cemented carbides are suggested.</p>","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"108 2","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142762618","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Preparation of high-strength Si3N4 ceramics via vat photopolymerization: A bi-phase particle size gradation strategy","authors":"Xuye Wang,&nbsp;Wenyan Duan,&nbsp;Shan Li,&nbsp;Zhifeng Huang,&nbsp;Bingshan Liu,&nbsp;Gong Wang,&nbsp;Fei Chen","doi":"10.1111/jace.20229","DOIUrl":"https://doi.org/10.1111/jace.20229","url":null,"abstract":"<p>This paper introduces an approach to preparing high-strength Si₃N₄ ceramics using vat photopolymerization with a bi-phase particle size gradation strategy. The influence of different ratios of coarse β-Si₃N₄ powders (Cβ) and fine α-Si₃N₄ powders (Fα) on the slurry performance, microstructure evolution, and final ceramic strength was systematically studied. It was found that an appropriate particle size gradation can significantly reduce the viscosity of the slurry. The curing depth of Si₃N₄ slurries decreases with increasing Fα content, while the stability increases. During sintering, dissolved Fα-Si₃N₄ not only directly precipitates into small elongated β-Si₃N₄ grains but also onto the neighboring Cβ-Si₃N₄, promoting the development of large elongated β-Si₃N₄ grains and resulting in a bimodal microstructure distribution. The highest strength of Si₃N₄ ceramics was achieved with a ratio of 6:4 Cβ to Fα Si₃N₄ powders. Under these conditions, the Si₃N₄ ceramics exhibited a flexural strength of 472 MPa, significantly higher than that of Si₃N₄ ceramics prepared using pure Cβ/Fα powders. The strength improvement is primarily due to the well-designed bi-phase particle size gradation strategy, which optimizes slurry performance, minimizes defects that may be introduced during the green part printing process while controlling the microstructure evolution during sintering, achieves the ideal bimodal microstructure distribution. The outcomes of this research demonstrate the feasibility of using vat photopolymerization with bi-phase particle size gradation for the preparation of high-strength Si₃N₄ ceramics, which has great potential for application in the manufacturing of various ceramic products.</p>","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"108 2","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142762620","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Strong piezoelectric anisotropy in CaBi4Ti4O15 textured ceramics prepared by templated grain growth method","authors":"Yike Wang,&nbsp;Mingyang Tang,&nbsp;Xiaodan Ren,&nbsp;Xin Liu,&nbsp;Zhuo Xu,&nbsp;Yongke Yan","doi":"10.1111/jace.20207","DOIUrl":"https://doi.org/10.1111/jace.20207","url":null,"abstract":"<p>Bismuth layer-structured ferroelectrics (BLSF) show great potential as piezoelectric materials for high-temperature applications. In this study, <i>c</i>-axis/[001]-textured CaBi₄Ti₄O₁₅ (CBT) ceramic was synthesized through templated grain growth (TGG) method. A high Lotgering factor (<i>f</i>) of 96% was achieved in textured CBT ceramic using 20 wt% CBT homogeneous template. The piezoelectric coefficient <i>d</i>₃₃ has significantly increased from 7.8 pC/N for random ceramic to 24.3 pC/N for textured ceramic (poled perpendicular to the <i>c</i>-axis/[001] texture direction), representing an impressive 300% enhancement while maintaining an ultra-high Curie temperature (<i>T</i>_C) of 788°C. In addition, a low dielectric loss (tan<i>δ</i> = 0.4%) and relatively high resistivity <i>(ρ </i>= 1.1 × 10¹² Ω·cm) were achieved simultaneously at room temperature. The significant enhancement of <i>d</i>₃₃ in textured CBT ceramic origins from its strong piezoelectric anisotropy. The large <i>d</i>_33,T⊥ is due to the nature of polarization switching in CBT (the spontaneous polarization <i>P</i>_S of CBT is along <i>a</i>-axis direction, and the switching of <i>P</i>_S is restricted within the <i>a</i>–<i>b</i> plane). Furthermore, the variation of <i>d</i>_33,T⊥ remained below 10% across the temperature range of 25–700°C, highlighting the excellent thermal stability of the textured CBT ceramics. These findings suggest that textured CBT ceramic is a promising piezoelectric material for high-temperature sensor applications.</p>","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"108 2","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142762786","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 review of near-net shape forming by hot isostatic pressure technology","authors":"Zhoujin Lv,&nbsp;Min Lu,&nbsp;Guoqiang Xiao,&nbsp;Yuan Ma,&nbsp;Ding Weng,&nbsp;Bao Wang,&nbsp;Zeyang Shang,&nbsp;Wen Qi,&nbsp;Lei Chen,&nbsp;Jinlin Chang,&nbsp;Jiadao Wang","doi":"10.1111/jace.20196","DOIUrl":"https://doi.org/10.1111/jace.20196","url":null,"abstract":"<p>Near-net shaping hot isostatic pressing (NNS-HIP) forming process has the advantage of high material utilization ratio and good uniformity of billet microstructure. It is widely used to produce critical parts for harsh service environments in special fields such as aerospace and energy and chemical industry. This paper introduces the process characteristics and production flow of hot isostatic near-net forming, the representative materials of hot isostatic near-net forming, the development and application at home and abroad, and the micro- and macromodels of numerical simulation powder densification by HIP near-net forming. Finally, the challenges and development trends of this technology are prospected, and corresponding countermeasures are put forward.</p>","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"108 2","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142762784","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Superior energy storage performance in NaNbO3-based lead-free ceramics under low electric field","authors":"Kun Liu,&nbsp;Ping Peng,&nbsp;Zhongqian Lv,&nbsp;Hengchang Nie,&nbsp;Genshui Wang","doi":"10.1111/jace.20209","DOIUrl":"https://doi.org/10.1111/jace.20209","url":null,"abstract":"<p>NaNbO₃ (NN)-based materials have attracted widespread attention due to their advanced energy storage performance and eco-friendliness. However, achieving high recoverable energy storage densities (<i>W</i>_rec) and efficiency (<i>η</i>) typically requires ultrahigh electric fields (<i>E </i>&gt; 300 kV/cm), which can limit practical use. In this work, we present a synergistic strategy that employs the ferroelectric material Bi_0.5Na_0.5TiO₃ (BNT) to augment the <i>P</i>_max and the linear material Bi_0.2Sr_0.7TiO₃ (BST) to optimize the <i>P</i>–<i>E</i> loops. Furthermore, a two-step sintering process is implemented to preserve high <i>P</i>_max values under lower electric field. As a result, ternary (1−<i>x</i>)(0.90NN-0.10BNT)-<i>x</i>BST was successfully prepared, achieving a high <i>W</i>_rec of 5.1 J/cm³ and a <i>η</i> of 85% in <i>x </i>= 0.20 samples at a low electric field of 290 kV/cm. Moreover, the <i>x </i>= 0.20 samples showed good frequency stability (1–200 Hz) and temperature stability (27°C–100°C). These results provide guidance for the development of ceramics with high energy storage properties under low electric fields.</p>","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":"108 2","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142762787","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}