International Journal of Applied Ceramic Technology最新文献

{"title":"Preparation and forming mechanism of honeycomb-like zinc aluminate porous ceramics","authors":"Xiaoli Mei,&nbsp;Jianying Hao,&nbsp;Qi Liu,&nbsp;Zhenguo Zhu,&nbsp;Shuo Bai,&nbsp;Fuyan Wang","doi":"10.1111/ijac.15179","DOIUrl":"10.1111/ijac.15179","url":null,"abstract":"<p>Porous ceramics have potential practical significance. The honeycomb-like zinc aluminate (ZnAl₂O₄) porous ceramics were successfully prepared using bauxite and zinc oxide as raw materials and soluble starch as pore-forming agent at 1250°C. The effects of different starch contents on the phase composition, mechanical properties, and microstructure of porous ceramics were systematically investigated. The starch is evenly dispersed in the powder mixture and filled in the space between the particles. When the starch content increases, the starch oxidizes and decomposes at high temperature to form some large pores, and the pores may be turned to honeycomb-like structure under the action of surface tension at the grain boundaries. When 40% starch is added, the prepared ZnAl₂O₄ ceramics have better comprehensive performance, 49.37% of apparent porosity, 2.19 g·cm⁻³ of bulk density, and 8.7 MPa and 19.23 MPa of flexural and compressive strength.</p>","PeriodicalId":13903,"journal":{"name":"International Journal of Applied Ceramic Technology","volume":"22 5","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144814593","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Enhanced ferroelectric properties derived at low voltages in manganese and cobalt Co-doped lead-free BNT-based films","authors":"Yuou Yuan,&nbsp;Hengchang Nie,&nbsp;Zhiyan Guo,&nbsp;Jinghui Peng,&nbsp;Biao He,&nbsp;Genshui Wang,&nbsp;Shiguang Yan,&nbsp;Fanglin Du,&nbsp;Liang Shi,&nbsp;Xiaofei Qu,&nbsp;Shuai Zhang","doi":"10.1111/ijac.15190","DOIUrl":"10.1111/ijac.15190","url":null,"abstract":"<p>Ferroelectric thin films have emerged as a research focus in recent years due to their outstanding performance and eco-friendliness. This study reports on the fabrication of high-quality 0.55Bi_0.5Na_0.5TiO₃-0.45SrTiO₃+0.5 mol% Mn+x mol% Co (BNT-ST-Mn-x%Co) thin films on LaNiO₃/Si (100) substrates using the sol–gel and spin–coating techniques. Through comprehensive structural analysis using multiple techniques, including X-ray diffraction, scanning electron microscopy, and X-ray photoelectron spectroscopy, we demonstrate that cobalt incorporation enhances both the breakdown strength and relaxation properties of these films. Notably, the BNT-ST-Mn-1%Co film exhibits exceptional characteristics, achieving a maximum polarization of 73.62 µC/cm² under an electric field of 900 kV/cm, coupled with a dielectric constant of 1119 at 1 kHz. The co-doping of cobalt and manganese yields films with high polarization intensity even at lower electric fields, showcasing promising potential for a wide range of applications.</p>","PeriodicalId":13903,"journal":{"name":"International Journal of Applied Ceramic Technology","volume":"22 5","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144814595","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Study on ductile/brittle removal transition during grinding of WC–HEA cemented carbide","authors":"Xueliang Li,&nbsp;Jin Du,&nbsp;Guosheng Su,&nbsp;Peirong Zhang,&nbsp;Yujing Sun,&nbsp;Binxun Li,&nbsp;Yan Xia","doi":"10.1111/ijac.15186","DOIUrl":"10.1111/ijac.15186","url":null,"abstract":"<p>High-entropy cemented carbide (tungsten carbide–high-entropy alloy [WC–HEA]), as a novel class of ultrahard materials developed in recent years, exhibits exceptional mechanical properties including high strength, hardness, and wear resistance. However, the fundamental mechanisms governing its surface formation during grinding processes remain poorly understood. This study systematically investigates the ductile–brittle transition behavior through progressive-depth single-grit scratch experiments combined with theoretical modeling. Experimental characterization of scratch forces, surface morphology evolution, and three-dimensional morphology was conducted under strictly controlled conditions. A predictive model for critical cutting depth was developed based on the Griffith energy balance criterion and indentation fracture mechanics theory. The scratching experiment results reveal three distinct material removal regimes: (1) Ductile-dominated removal (scratching depth &lt;0.802 µm) producing defect-free surfaces. (2) Transition regime (0.802–2.53 µm) characterized by intermittent crack initiation (first macrocrack observed at 0.802 µm). (3) Brittle fracture-dominated removal (&gt;2.53 µm) exhibiting severe surface damage. Cross-sectional scanning electron microscopy (SEM) analysis confirmed the absence of lattice defects in ductile removal mode processing, while brittle removal mode showed intergranular cracking along WC/HEA interfaces. The experimental transition thresholds show &lt;15% deviation from theoretical predictions, validating the proposed model. This work establishes a theoretical framework for achieving damage-free machining of WC–HEA composites, with critical implications for high-quality surface processing in precision manufacturing applications.</p>","PeriodicalId":13903,"journal":{"name":"International Journal of Applied Ceramic Technology","volume":"22 5","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144815156","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Structure design of transparent ceramic armor based on machine learning and particle swarm optimization method","authors":"Zheyuan Long,&nbsp;Yangwei Wang,&nbsp;Rui An,&nbsp;Jiawei Bao,&nbsp;Pingluo Zhao,&nbsp;Bingyue Jiang,&nbsp;Jingbo Zhu","doi":"10.1111/ijac.15184","DOIUrl":"10.1111/ijac.15184","url":null,"abstract":"<p>Transparent ceramic armor with laminated structures encounters significant design challenges in achieving an optimal balance among ballistic protection, weight, optical clarity, and cost through thickness optimization. Traditional experimental and simulation-based approaches face difficulties in multiobjective optimization due to their high computational demands and inability to reconcile conflicting requirements. This study introduces a novel machine learning-guided particle swarm optimization framework, representing an advancement in armor design methodology. For a “sapphire/glass/polycarbonate (PC)” armor system subjected to 12.7 mm armor-piercing incendiary (API) threats, we first develop a physics-based <i>Defense</i> function that integrates penetration resistance (residual projectile energy) and protection redundancy (bulge deformation) into a single quantifiable metric on a 0–1 scale. A validated finite element model generates ballistic performance data for 196 configurations, enabling comparative training of three machine learning models. The support vector regression (SVR) model achieves exceptional accuracy (<i>R</i>² = 0.98, <i>rRMSE</i> &lt; 4%) in predicting <i>Defense</i> values, surpassing both XGBoost and neural networks. By integrating this predictive capability with an enhanced multiobjective particle swarm algorithm, we established a real-time feedback optimization framework. This framework simultaneously reduces thickness by 22.2% and enhances transparency by 42.3%, while only incurring a 28.8% increase in cost and ensuring the protection threshold remains above the required level (<i>Defense</i> ≥ 0.5) during the optimization process. Experimental validation demonstrates that the optimized configurations preserve the predetermined ballistic resistance performance while achieving balanced improvements in thickness reduction, transmittance increase, and cost efficiency. This study exemplifies the synergistic potential of machine learning and particle swarm optimization for transparent armor design, offering a generalized approach to multiphysics optimization in protective material systems. It addresses longstanding challenges in traditional trial-and-error methodologies through intelligent algorithms that incorporate constraint-aware thickness distribution.</p>","PeriodicalId":13903,"journal":{"name":"International Journal of Applied Ceramic Technology","volume":"22 5","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144815239","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 Fe substitution at the B-site on the pyroelectric properties of bismuth titanate ceramics","authors":"Shuang He,&nbsp;Shaobo Guo,&nbsp;Fei Cao,&nbsp;Chunhua Yao,&nbsp;Genshui Wang","doi":"10.1111/ijac.15174","DOIUrl":"10.1111/ijac.15174","url":null,"abstract":"<p>The effect of the B-site substitution with the low-valent Fe ion on the properties of lead-free bismuth titanate (BNT) ferroelectric ceramics is explored. In this work, a series of ceramics with different Fe substitution concentrations are prepared. The Bi_0.5Na_0.5Ti_0.999Fe_0.001O₃ (BNTF-0.1) ceramic has the highest depolarization temperature (<i>T_d</i> ≈ 213°C). The dielectric constant and dielectric loss fluctuate slightly with decreasing frequency. The pyroelectric coefficient <i>p</i> appreciably increases from 2.25 × 10⁻⁴ C·m⁻²·K⁻¹ for BNT to 2.88 × 10⁻⁴ C·m⁻²·K⁻¹ for BNTF-0.1 at room temperature (RT). The figures of merit (FoMs) for BNTF-0.1 component have also been improved at RT, where current figure of merit (<i>F_i</i>) = 1.02 × 10⁻¹⁰ m V⁻¹, voltage figure of merit (<i>F_v</i>) = 3.51 × 10⁻² m² C⁻¹, and detectivity figure of merit (<i>F_D</i>) = 1.66 × 10⁻⁵ Pa^−1/2, which is attributed to its lower dielectric constant (∼330) and dielectric loss (∼0.0131). Between 20°C and 80°C, the values of the FoMs remain stable, with the <i>F_D</i> of BNTF-0.1 varying by only ±6.2%, indicating its superior temperature stability. These results confirm that low-cost Fe substitution is an available strategy for optimizing the performance of BNT-based ceramics. BNTF-x ceramics would be excellent candidates for lead-free pyroelectric infrared detection.</p>","PeriodicalId":13903,"journal":{"name":"International Journal of Applied Ceramic Technology","volume":"22 5","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144815136","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The effect of different surface treatments on the shear bond strength of new generation zirconia","authors":"Merve Buse Kultas Kaleli,&nbsp;Oğuz Eraslan","doi":"10.1111/ijac.15183","DOIUrl":"10.1111/ijac.15183","url":null,"abstract":"<p>This study aimed to assess the effect of various surface roughening techniques on the shear bond strength of three new-generation zirconia ceramics. Specimens of 4Y-TZP/5Y-TZP zirconia (IPS e.max ZirCAD), 3Y-TZP monolithic zirconia (Vita YZ HT), and 3Y-TZP/5Y-TZP zirconia (IPS e.max ZirCAD Prime) were prepared using CAD/CAM and sintered as per manufacturers' instructions. Four surface treatments—control, sandblasting, tribochemical silica coating(TSC), and Er:YAG laser etching—were applied to yield 12 subgroups (<i>n</i> = 10). Specimens were treated with an MDP primer and cemented using dual-cure self-adhesive resin cement. Shear bond strength was measured using a universal testing machine at 1 mm/min. Statistical analysis included Shapiro-Wilk, two-way analysis of variance (ANOVA), and Tukey HSD tests (<i>p</i> &lt; 0.05). Sandblasting and TSC significantly improved shear bond strength (<i>p</i> &lt; .001). The Vita YZ HT group exhibited higher bond strength compared with IPS e.max ZirCAD (<i>p</i> = 0.004). Cohesive and mixed fractures predominated in sandblasting and TSC groups, whereas Er:YAG laser treatment yielded bond strength similar to controls (<i>p</i> = .386). Shear bond strength is influenced by the type of zirconia ceramic, surface treatment, and their interaction (<i>p</i> &lt; .001). Sandblasting and TSC are highly effective, underscoring the clinical importance of surface preparation for durable zirconia bonding.</p>","PeriodicalId":13903,"journal":{"name":"International Journal of Applied Ceramic Technology","volume":"22 5","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ceramics.onlinelibrary.wiley.com/doi/epdf/10.1111/ijac.15183","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144815186","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Microstructure and microwave dielectric properties of (1 ‒ x)Ba[(Zn0.6Mg0.4)1/3Nb2/3]O3‒xBaSnO3 ceramics","authors":"Shanshan Li,&nbsp;Duo Zhang,&nbsp;Zhongqing Tian,&nbsp;Liangliang Cao,&nbsp;Fei Wang,&nbsp;Chunyan Zhang,&nbsp;Fancheng Meng","doi":"10.1111/ijac.15175","DOIUrl":"10.1111/ijac.15175","url":null,"abstract":"<p>(1 ‒ <i>x</i>)Ba[(Zn_0.6Mg_0.4)_1/3Nb_2/3]O₃‒<i>x</i>BaSnO₃ ((1 ‒ <i>x</i>)BZMN‒<i>x</i>BS, <i>x</i> = 0.2, 0.25, 0.3, 0.35) ceramics were prepared by a conventional solid-phase reaction method, and their crystal structures and microwave dielectric properties were investigated. Ba[(Zn_0.6Mg_0.4)_1/3Nb_2/3]O₃ and BaSnO₃ formed a perovskite solid solution with trace amounts of barium niobium oxide as a second phase. Raman spectroscopy confirms the presence of 1:1 and 1:2 short-range ordered structures in the ceramics. The doping of Sn⁴⁺ hinders the growth of grains and leads to a decrease in grain size. The dielectric constant decreases with increasing <i>x</i> values. The grain size, B-site Rattling effect and B-site short-range ordering together determine the <i>Qf</i> value of the (1 ‒ <i>x</i>)BZMN‒<i>x</i>BS ceramics, which reaches a maximum value of 62 203 GHz at <i>x</i> = 0.3. <i>τ</i>_f decreases as the value of <i>x</i> increases. The main mechanism regulating the (1 ‒ <i>x</i>)BZMN‒<i>x</i>BS ceramics <i>τ</i>_f is ion polarizability dilution. 0.75BZMN‒0.25BS ceramics have the best dielectric properties: <i>ε</i>_r ∼ 29.42, <i>τ</i>_f ∼ ‒0.74 ppm/°C, and <i>Qf</i> ∼ 57 256 GHz. The raw material cost of the 0.75BZMN‒0.25BS ceramics is nearly 20% lower than that of Ba[(Mg_0.4Ni_0.6)_1/3Nb_2/3]O₃ and Ba[(Co_0.8Mg_0.2)_1/3Nb_2/3]O₃ ceramics, implying that the ceramics have a good prospect for application.</p>","PeriodicalId":13903,"journal":{"name":"International Journal of Applied Ceramic Technology","volume":"22 5","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144815237","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Characterization of shear failure of refractory fireclay mortar joints using slant shear test at room temperature","authors":"Muhan Wu,&nbsp;Alain Gasser,&nbsp;Shengli Jin,&nbsp;Harald Harmuth,&nbsp;Dietmar Gruber","doi":"10.1111/ijac.15185","DOIUrl":"10.1111/ijac.15185","url":null,"abstract":"<p>Mortar joints are commonly used in industrial vessels to stabilize refractory linings. Quantification of their mechanical and thermomechanical behaviors is required for appropriate applications. In this study, slant shear tests of mortar joints using refractory–mortar–refractory sandwich structures were performed at room temperature, and the finite element method was used to explain the mechanisms that cause different types of cracking phenomena within the mortar joint. The impact of the testing configuration and surface roughness of the brick samples on load-displacement curves and maximum loads was investigated. Maximum loads with small deviations were obtained using an improved preparation method and testing configuration. The cohesion and friction angle, which define the Mohr–Coulomb criterion at room temperature, are calculated and applied in the simulation. It was discovered that the competition between the brick-mortar interface bonding strength and the mortar strength determined the cracking path, and their impact on the maximum load was slight.</p>","PeriodicalId":13903,"journal":{"name":"International Journal of Applied Ceramic Technology","volume":"22 5","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ceramics.onlinelibrary.wiley.com/doi/epdf/10.1111/ijac.15185","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144815188","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Solid loading effects on the assembly of alumina particles in aqueous suspensions due to the dielectrophoretic forces","authors":"Sivakumar Chithamallu,&nbsp;Rohan Parai,&nbsp;Dipankar Ghosh","doi":"10.1111/ijac.15176","DOIUrl":"10.1111/ijac.15176","url":null,"abstract":"<p>Current work in situ investigated the mechanisms of the interparticle interactions that evolve in dilute aqueous alumina suspensions subjected to alternating current (AC) electric field and the effects of solid loading of suspensions. The interactions were investigated for alumina suspension compositions in the 0.005‒0.04 vol.% solid loading range. Field-induced interactions evolved via particle motion and dynamic assembly, chain formation parallel to the direction of the applied field and chain growth, chain cross-linking, and chain thickening. The evolution time of each of those events was rapidly accelerated with solid loading. While chain cross-linking was negligible in low solid loading suspensions, a dense network of thick chains evolved in higher solid loading suspensions. An important takeaway was that with the increasing solid loading, individual chains could only grow independently up to a comparable length in most of the suspensions but at a rapidly decreasing field duration. Solid loading effects originated due to the decrease in the interparticle distances and increase in the number of particles in a given volume with solid loading, increasing attractive dielectrophoretic (DEP) interaction forces and accelerating the interactions. Insights were shed into the role of AC field in the freeze-casting of ceramics from concentrated suspensions.</p>","PeriodicalId":13903,"journal":{"name":"International Journal of Applied Ceramic Technology","volume":"22 5","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ceramics.onlinelibrary.wiley.com/doi/epdf/10.1111/ijac.15176","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144815236","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Reliability of CaZrO3 and MgO capacitors at high temperatures","authors":"Alan Devoe,&nbsp;Hung Trinh,&nbsp;Fatih Dogan","doi":"10.1111/ijac.15180","DOIUrl":"10.1111/ijac.15180","url":null,"abstract":"<p>Calcium zirconate and magnesium oxide have both been found to have useful dielectric properties at high temperatures. Multilayer ceramic capacitors (MLCCs) were made with these dielectrics and platinum electrodes. The relationship between the lifespan (mean-time to failure) and applied voltage was determined using Weibull statistics. CaZrO₃ capacitors were tested between 550°C and 600°C while MgO capacitors were tested between 600°C and 650°C. The temperature coefficient <i>E_a</i> and the voltage coefficient <i>n</i> of the Prokopowicz–Vaskas equation were determined under various test conditions. Activation energies for calcium zirconate and magnesium oxide were 3.25 eV and 3.48 eV, respectively. Resistance degradation of CaZrO₃ and MgO capacitors, tested at 600°C and 250 V, were compared.</p>","PeriodicalId":13903,"journal":{"name":"International Journal of Applied Ceramic Technology","volume":"22 5","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144815234","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}