Ceramics International最新文献

{"title":"Anomalous large positive τf of two K20 microwave dielectric ceramics LaMGa11O19 (M = Mg, Zn) as temperature compensators","authors":"Feilong Liu ,&nbsp;Junqi Chen ,&nbsp;Huaicheng Xiang ,&nbsp;Jie Li ,&nbsp;Yang Yang ,&nbsp;Ying Tang ,&nbsp;Liang Fang","doi":"10.1016/j.ceramint.2025.06.187","DOIUrl":"10.1016/j.ceramint.2025.06.187","url":null,"abstract":"<div><div>In this work, two novel hexagonal magnetoplumbite-type LaMGa₁₁O₁₉<span><span> (M = Mg, Zn) ceramics were prepared and deeply investigated. XRD patterns, </span>SAED<span> and HRTEM images analysis results demonstrated that the LaMGa</span></span>₁₁O₁₉ (M = Mg, Zn) ceramics are formation of hexagonal magnetoplumbite structure with a space group of <em>P</em>6₃/<em>mmc</em>. Both ceramics exhibited relatively high density (&gt;95 %) and large positive <em>τ</em>_<em>f</em> (+145.1 and + 136.7 ppm/°C), combined with moderate <em>ε</em>_<em>r</em> around 20 and reasonable <em>Q</em> × <em>f</em><span> values of 19,328 GHz and 22,197 GHz, which be used as a temperature compensator for LTCC applications. The intense rattling effect of La</span>³⁺<span> cations resulted in abnormally high dielectric constant<span> with a large positive variation by a factor of over 0.70 from the theoretical values calculated using the Clausius-Mossotti formula according to each ion's polarizability, negative </span></span><em>τ</em>_<em>αm</em>, and positive <em>τ</em>_<em>f</em><span> values. The P–V–L chemical bond theory analysis and impedance spectroscopy<span> showed that the large dielectric loss might result from the high ionicity of the La-O bond and conduction loss, thus leading to relatively low </span></span><em>Q</em> × <em>f</em> for the LaMGa₁₁O₁₉ (M = Mg, Zn) ceramics.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 23","pages":"Pages 39522-39530"},"PeriodicalIF":5.6,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144922245","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":"Synergistic immobilization of complex TRPO-CS nuclear waste by natural mineral materials: Glass and CsAlSiO4 dominant glass-ceramics","authors":"Wenhong Han ,&nbsp;Xiaoyan Shu ,&nbsp;Ran Tan ,&nbsp;Yuxuan He ,&nbsp;Shunzhang Chen ,&nbsp;Guilin Wei ,&nbsp;Xirui Lu","doi":"10.1016/j.ceramint.2025.06.272","DOIUrl":"10.1016/j.ceramint.2025.06.272","url":null,"abstract":"<div><div><span><span>This study presents a nature-inspired approach for innovatively immobilizing complex TRPO-CS waste (containing Cs, </span>Sr<span><span>, and Ba) using natural hornblende granulite, leveraging its unique dual-phase formation capability for sustainable </span>nuclear waste disposal. Through comprehensive characterization of mass loss behavior, phase evolution, microstructure, elemental distribution, and glass-ceramic transformation, demonstrated that granite can achieve dual phase stable solidification of complex TRPO-CS waste: glass (0-20 </span></span><em>wt</em>%) and CsAlSiO₄ dominant glass-ceramics (30-60 <em>wt</em>%). The formation of the CsAlSiO₄<span><span> ceramic phase significantly enhances the immobilization of Cs and Sr while reducing mass loss (with minimum values of ∼6 % for Cs and ∼0.3 % for Sr, respectively). The solidification demonstrates exceptional </span>mechanical stability (density: 3.20 g/cm</span>³<span>; Vickers hardness: 8.58 GPa) and chemical durability (leaching rates: ∼10</span>⁻⁴ g/m²<span><span>·d for Cs, Sr and Ba after 28 d). This study establishes natural granite as a highly stable matrix for immobilizing complex volatile TRPO-CS waste for the first time, providing a reliable solution for challenging low melting point </span>radioactive waste streams.</span></div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 23","pages":"Pages 40367-40378"},"PeriodicalIF":5.6,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144922649","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":"Long-time ablation behaviors of SiCnw-(ZrC-SiC) integrated coating on modified C/C composites","authors":"Xinfa Tian ,&nbsp;Li Yang ,&nbsp;Hejun Li ,&nbsp;Xiaohong Shi ,&nbsp;Hongjiao Lin","doi":"10.1016/j.ceramint.2025.06.278","DOIUrl":"10.1016/j.ceramint.2025.06.278","url":null,"abstract":"<div><div><span><span>The integrated molding of the coating and modified matrix was achieved by the precursor impregnation and pyrolysis (PIP) method. The average mass </span>ablation rate of the prepared SiCnw-(ZrC-SiC) integrated coating on modified C/C composite material is only 0.60 mg/s after 5 × 120 s of ablation. The coating on the surface of the material is just exfoliated after 3 cycles of ablation. Additionally, there is still a protective layer formed by ZrO</span>₂-SiO₂<span> on the surface of the matrix after 5 cycles of ablation. The results demonstrate that the integrated coating/matrix-modification is successful in enhancing thermal shock resistance and prolonging ablation life of the material.</span></div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 23","pages":"Pages 40431-40440"},"PeriodicalIF":5.6,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144922654","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":"Cr3+-activated ternary oxide Mg3ZnNb2O9 phosphors showing efficient broadband near-infrared luminescence","authors":"Lifang Yuan,&nbsp;Junzhong Wang,&nbsp;Zhijin Huang,&nbsp;Kaixiang Shen","doi":"10.1016/j.ceramint.2025.06.279","DOIUrl":"10.1016/j.ceramint.2025.06.279","url":null,"abstract":"<div><div><span><span>Broadband near-infrared (NIR) phosphor-converted light-emitting diodes (pc-LEDs) have recognized a transformative technology for next-generation optoelectronic applications, yet their performance is hindered by the limited </span>emission wavelength, efficiency, and thermal stability of existing NIR phosphors. This work reports on a novel Cr</span>³⁺<span>-activated ternary oxide Mg</span>₃ZnNb₂O₉ phosphor with a broadband NIR emission. The optimized sample Mg₃ZnNb₂O₉:0.9 %Cr³⁺<span> showcase emission spectrum spanning 700–1300 nm with a peak at 870 nm and a full width at half maximum (FWHM) of 184 nm, attributed to the spin-allowed </span>⁴T₂→⁴A₂<span><span> transition under weak crystal field<span>. The material demonstrates an internal quantum efficiency (IQE) of 70.5 % and luminescence thermal stability retaining 42 % emission intensity at 373 K. A low Huang-Rhys factor (S = 2.46) is confirmed, accounting for weak electron-phonon coupling effect. A prototype NIR pc-LED fabricated with the optimized phosphor achieves an output power of 81 mW at 200 mA, enabling night vision applications. By elucidating the structure-property relationship, this work advances the rational design of novel NIR phosphors for next-generation smart NIR </span></span>light sources.</span></div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 23","pages":"Pages 40441-40447"},"PeriodicalIF":5.6,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144922655","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":"Enhancement of corrosion resistance and wear resistance of waterborne epoxy resin by polydopamine-modified siloxene","authors":"Songlin He ,&nbsp;Chao Zhang ,&nbsp;Changhua Li ,&nbsp;Yongxin Hu ,&nbsp;Chuan Fu ,&nbsp;Chuanfang Zhang ,&nbsp;Xinbo Xu ,&nbsp;Haichao Zhang ,&nbsp;Yi He","doi":"10.1016/j.ceramint.2025.06.257","DOIUrl":"10.1016/j.ceramint.2025.06.257","url":null,"abstract":"<div><div><span>As a new 2D silicon-based material, siloxene (Sic) sheets show great application prospects in battery, supercapacitor<span>, and electrocatalytic fields due to excellent electrochemical and catalytic properties, but have significant research gaps in metal coating applications, especially lack of systematic research on enhancing wear and </span></span>electrochemical corrosion<span><span> resistance in organic systems, which urgently needs filling. Therefore, throughout the study, Sic nanosheets were fabricated through topological chemistry-based synthesis and incorporated into epoxy (EP) resin composites, and the influence of 2D Sic sheet on dual resistance of composites to corrosion and abrasion was discussed. Emulsion-induced and self-polymerization methods were used to grow polydopamine (PDA) upon the outer exterior of Sic, which improved the friction and </span>corrosion resistance<span><span> of Sic composite coatings<span> and promoted stronger interfacial bonding between Sic and the resin matrix. The corrosion and abrasion resistance properties of the composite coatings were evaluated via electrochemical impedance spectroscopy (EIS), manual scratch testing, and </span></span>tribological analysis<span><span>. In a comparative evaluation, composite coatings containing 1.0 wt%Sic@PDA after 60 days of exposure to 3.5 wt% sodium chloride solution, the impedance modulus at a frequency of 0.01 Hz, the value rose by three orders of magnitude, concurrent with a three-order decrease in corrosion current density, indicating excellent corrosion resistance. The wear rate was significantly decreased by 66.6 % compared to pure EP coating, indicating enhanced wear resistance. This study presents a synergistic strategy of topological synthesis and organic modification for Sic materials functionalization, offering new thinking for </span>metal matrix composite coatings in harsh environments (e.g., aerospace, marine) via dual corrosion-wear resistance enhancement. This study is expected to facilitate the transition of 2D silicon-based materials from basic research to industrialized wear- and corrosion-resistant coating applications.</span></span></span></div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 23","pages":"Pages 40244-40260"},"PeriodicalIF":5.6,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144922682","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":"Optimization of braze sealing process for ZrO2/Ti6Al4V glass connections: Interface impact studies","authors":"Fei Ji,&nbsp;Yuanxing Li,&nbsp;Wenxin Dong,&nbsp;Yuanjie Chi,&nbsp;Menglin Li,&nbsp;Lukai Luo,&nbsp;Tao Zou,&nbsp;Hui Chen","doi":"10.1016/j.ceramint.2025.06.254","DOIUrl":"10.1016/j.ceramint.2025.06.254","url":null,"abstract":"<div><div><span><span>This study systematically investigates the interface-strengthening mechanisms of bismuth-based sealing glass for brazing Ti6Al4V </span>titanium alloy and ZrO</span>₂<span> ceramic in an air environment. As key materials in aerospace, biomedical, and electronic packaging<span><span><span> applications, the reliable joining of titanium alloys and ceramics is significant for expanding their composite applications. Given the thermal sensitivity of sealing glass, which requires precise control of the bonding temperature to achieve reliable connections, this study explores the influence of brazing temperature and holding time on the </span>interface structure and mechanical properties. When the brazing process parameters were optimized to 650 °C/30 min, the </span>joint<span><span> achieved the highest shear strength, with an average value of 35 MPa. Under these optimized conditions, a composite structure consisting of </span>nanoscale Bi</span></span></span>₄Ti₃O₁₂<span><span> precipitates and Bi single-phase formed at the interface, effectively enhancing the bonding strength of the heterogeneous materials through chemical bonding. When the temperature exceeded the critical value or the holding time was extended, abnormal coarsening of the precipitates occurred, leading to intensified stress concentration effects and a significant decline in </span>interfacial bonding strength. By establishing the correlation mechanism among process parameters, interface structure, and mechanical properties, this study confirms that controlling the size of interfacial precipitates is a key factor in improving the bonding strength of metal/ceramic joints.</span></div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 23","pages":"Pages 40212-40222"},"PeriodicalIF":5.6,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144922830","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":"Tunable warm white emission in Eu3+/Dy3+ co-doped K2Y(WO4)(PO4) phosphors for solid-state lighting","authors":"Peiyuan Zhuang ,&nbsp;Wei Liu ,&nbsp;Haohao Cao ,&nbsp;Yunan Lin ,&nbsp;Yan Guo ,&nbsp;Jinghui Zhang ,&nbsp;Yanjie Zhang","doi":"10.1016/j.ceramint.2025.06.200","DOIUrl":"10.1016/j.ceramint.2025.06.200","url":null,"abstract":"<div><div>A series of K₂Y(WO₄)(PO₄): Dy³⁺, Eu³⁺<span> phosphors have been successfully developed via solid-state reaction method to generate color-tunable warm white light. Based on the phase identification and microstructure analysis, Dy</span>³⁺ ions singly-doped and co-doped phosphors all exhibit single phase of K₂Y(WO₄)(PO₄) crystal, demonstrating the substitution of Y³⁺ ions by Dy³⁺ ions in host lattice. Under near ultraviolet (NUV) excitation of 350 nm, Dy³⁺ singly-doped K₂Y(WO₄)(PO₄) phosphors emit a cold-white light with correlated color temperature of 9266 K comprised by blue emission peak at 486 nm and yellow emission peak at 578 nm, which are attributed to ⁴F_9/2 → ⁶H_15/2 and ⁴F_9/2 → ⁶H_13/2 electronic transitions of Dy³⁺ ions, respectively. Further, Eu³⁺ and Dy³⁺ ions are co-doped K₂Y(WO₄)(PO₄) host and Eu³⁺<span> ions can be acted as red emission centers to achieve tunable photoluminescence<span> properties in a single-phased phosphor excited by NUV chip with wavelength of 394 nm. It is proved by the photoluminescence spectra of Eu</span></span>³⁺ and Dy³⁺ ions co-doped samples that there exist the energy transfer between Dy³⁺ ions and Eu³⁺ ions in the KYWP host, which belongs to the electric dipole-electric dipole interaction. Finally, CIE color coordinates of the generating white light by K₂Y(WO₄)(PO₄): Dy³⁺, Eu³⁺ phosphors can be facilely adjusted from (0.3601, 0.3427) to (0.5161, 0.3547) with the increasing Eu³⁺<span> ions concentration. The warm white light with tunable color temperatures of 4409 K, 3042 K, 2566 K and 1976 K can be achieved for K</span>₂Y(WO₄)(PO₄): Dy³⁺, Eu³⁺<span> phosphors, indicating a potential application in NUV white light emitting diodes.</span></div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 23","pages":"Pages 39648-39655"},"PeriodicalIF":5.6,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144922156","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":"Dielectric properties of KNbO3-Ca(Ti, Zr)O3 ceramics for X9R MLCC","authors":"Byeong-Jae Min ,&nbsp;Geun-Soo Lee ,&nbsp;San Kwak ,&nbsp;Boo-Hyun Choi ,&nbsp;Hyun-Ju Choi ,&nbsp;Bumjoo Kim ,&nbsp;Kyung-Bien Kim ,&nbsp;Hoyeon Kim ,&nbsp;Sahn Nahm","doi":"10.1016/j.ceramint.2025.06.202","DOIUrl":"10.1016/j.ceramint.2025.06.202","url":null,"abstract":"<div><div>The 0.87KNbO₃-0.13CaTiO₃ (0.87KN-0.13CT) ceramic provided a temperature-independent dielectric constant (<em>ε</em>_<em>r</em><span>), thereby fulfilling the specification of the X9R multilayer ceramic capacitor (MLCC). This ceramic has a nanodomain structure with large relaxor properties; however, it does not exhibit the core-shell structure. Therefore, the good temperature-stable </span><em>ε</em>_<em>r</em> value of the 0.87KN-0.13CT ceramic can be explained by its large relaxor properties. This ceramic has a comparatively small <em>ε</em>_<em>r</em> value of approximately 765, which indicates that an enhancement in the <em>ε</em>_<em>r</em> value is required for the practical application of this ceramic. A few Ti⁺⁴ ions in the 0.87KN-0.13CT ceramic were replaced by Zr⁺⁴ ions to increase the <em>ε</em>_<em>r</em> value; consequently, the 0.87KNbO₃-0.13Ca(Ti_0.94Zr_0.06)O₃ [KN-C(T_0.94Z_0.06)] ceramic exhibited an increased <em>ε</em>_<em>r</em> value of approximately 1016 with good temperature-stability, which satisfies the specification of the X9R MLCC. The MLCC was fabricated utilizing the KN-C(T_0.94Z_0.06<span>) ceramic and a 70Ag-30Pd electrode metal. The MLCC was well developed with a sharp interface between the ceramic thick film and the electrode. This MLCC satisfied the specification of the X9R MLCC and also exhibited outstanding supplied electric field stability. Therefore, the KN-C(T</span>_0.94Z_0.06<span>) is a good dielectric material for the X9R MLCC.</span></div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 23","pages":"Pages 39665-39676"},"PeriodicalIF":5.6,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144922161","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":"Incorporating Li2MnO3 nanocatalysts with mesoporous ZnWO4 enhances charge mobility and promotes the photocatalytic oxidation of atrazine","authors":"L.A. Al-Hajji ,&nbsp;Fatehy M. Abdel-Haleem ,&nbsp;Reda M. Mohamed ,&nbsp;Faisal K. Algethami ,&nbsp;Adel A. Ismail","doi":"10.1016/j.ceramint.2025.06.204","DOIUrl":"10.1016/j.ceramint.2025.06.204","url":null,"abstract":"<div><div><span>Atrazine<span> is an effective herbicide with universal publicity for its vigorous cytotoxicity as inhibitor of photosynthesis process and the degradation of atrazine is considered a serious challenges. Herein, S-scheme heterojunction Li</span></span>₂MnO₃/ZnWO₄<span> photocatalyst<span> was constructed by the impregnation and sol-gel path for promoting atrazine degradation upon visible illumination. XRD<span> and TEM images results verified Li</span></span></span>₂MnO₃ and ZnWO₄<span> phases were successfully constructed with the monoclinic structure and monoclinic wolframite. HRTEM images of Li</span>₂MnO₃/ZnWO₄ nanocomposite showed that the interplanar fringes of 0.429 nm and 0.46 nm were related to the planes of (022) and (100) for monoclinic phases of Li₂MnO₃ and ZnWO₄, respectively. The incorporation of Li₂MnO₃<span> NPs into mesoporous ZnWO</span>₄<span><span> matrix extended light absorption to support </span>photocatalytic ability. The 10 % Li</span>₂MnO₃/ZnWO₄ nanocomposite demonstrated potent destruction of atrazine up to 100 % within 50 min, which was 20 multiples higher than that of pristine ZnWO₄ NPs. The rate constant (k) for the atrazine degradation over 10 % Li₂MnO₃/ZnWO₄ nanocomposite (0.051 min⁻¹) was nearly enhanced 15 multiples greater than of pristine ZnWO₄ NPs (0.0034 min⁻¹). The k of 10 % Li₂MnO₃/ZnWO₄ photocatalyst (0.051 min⁻¹) was the highest compared with other photocatalysts. The enhancement photocatalytic performance of Li₂MnO₃/ZnWO₄ nanocomposite was explained by the outstanding absorption light capacity and enhanced separation of photoindiced charge in Li₂MnO₃/ZnWO₄ S-scheme heterojunction photocatalyst. Also, the synergistic impact between Li₂MnO₃ and ZnWO₄<span><span> could enhance charge migration and transport, thus promoting the photocatalytic efficiency. This work offers an efficient design toward strongly integrated nanocomposite photocatalysts for detoxification of organic pollutants under </span>visible light.</span></div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 23","pages":"Pages 39688-39698"},"PeriodicalIF":5.6,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144922163","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":"Fabrication and mechanical properties of functionally gradient TiCN–HfC–WC ceramics","authors":"Zhuo Wang ,&nbsp;Jiaojiao Gao ,&nbsp;Kuang Sun ,&nbsp;Xiong Niu ,&nbsp;Wei Xu ,&nbsp;Jinpeng Song ,&nbsp;Ming Lv","doi":"10.1016/j.ceramint.2025.06.193","DOIUrl":"10.1016/j.ceramint.2025.06.193","url":null,"abstract":"<div><div><span><span>The inherently low fracture toughness<span> of TiCN-based ceramics significantly limits their practical engineering applications. To address this, functionally gradient TiCN–HfC ceramics (FGTHCs) with a WC gradient were successfully fabricated using vacuum hot-pressing sintering, and they exhibited high toughness without sacrificing </span></span>strength<span> and hardness. As sintering temperature<span> increased, the flexural strength<span> and surface Vickers hardness<span> initially increased and then slightly decreased, whereas the fracture toughness gradually increased. At 1600 °C, FGTHC possessed optimal comprehensive mechanical properties, with a flexural strength of 1619.7 ± 32.6 MPa, a surface Vickers hardness of 20.13 ± 0.53 GPa, and a fracture toughness of 13.88 ± 0.59 MPa m</span></span></span></span></span>^1/2<span>. Under identical sintering conditions, FGTHC demonstrated superior mechanical properties compared to homogeneous TiCN–HfC ceramics (HTHCs), particularly in terms of fracture toughness (13.88 ± 0.59 vs. 8.53 ± 0.37 MPa m</span>^1/2<span><span>). From the surface to the core of FGTHC, the residual stress gradually changed from residual compressive stress (RCS) to residual </span>tensile stress<span> (RTS). RCS effectively inhibited crack propagation and enhanced crack deflection, whereas RTS induced crack deflection with a zigzag pattern.</span></span></div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 23","pages":"Pages 39576-39586"},"PeriodicalIF":5.6,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144922250","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}