Ceramics International最新文献_第8页

Characterization of temperature-dependent full-matrix constants of [001]c-poled Mn-doped 28PIN-43PMN-29PT single crystals using one sample

IF 5.1 2区材料科学

Ceramics International Pub Date : 2025-01-01 DOI: 10.1016/j.ceramint.2024.11.076

Kai Zhang , Ailing Xiao , Liguo Tang , Guisheng Xu , Wenyu Luo

{"title":"Characterization of temperature-dependent full-matrix constants of [001]c-poled Mn-doped 28PIN-43PMN-29PT single crystals using one sample","authors":"Kai Zhang , Ailing Xiao , Liguo Tang , Guisheng Xu , Wenyu Luo","doi":"10.1016/j.ceramint.2024.11.076","DOIUrl":"10.1016/j.ceramint.2024.11.076","url":null,"abstract":"<div><div>[001]<sub>c</sub>-poled Mn-doped xPb(In<sub>1/2</sub>Nb<sub>1/2</sub>)O<sub>3</sub>–(1–x–y)Pb(Mg<sub>1/3</sub>Nb<sub>2/3</sub>)O<sub>3</sub>–yPbTiO<sub>3</sub> (PIN–PMN–PT:Mn) single crystals (SCs) in the rhombohedral phase possess not only excellent piezoelectric properties but also a high mechanical quality factor, which make them suitable for fabricating high-performance piezoelectric devices. Characterizing the temperature dependence (TD) of full-matrix constants is indispensable for their use in device design. However, there is a significant lack of relevant data. In this study, the TD of the clamped dielectric properties of [001]<sub>c</sub>-poled 28PIN-43PMN-29PT:Mn SCs was characterized using a dielectric temperature spectroscopy measurement system from 0 to 60 °C. Their elastic and piezoelectric constants were measured using resonant ultrasound spectroscopy in the same temperature range. With an increase in the temperature, all the elastic stiffness constants decreased, whereas all the clamped dielectric constants and the absolute values of all the piezoelectric stress constants increased. The characterization process required only a single sample, which ensured the consistency of the results. Furthermore, the electrical impedance spectra of the sample at 30 and 50 °C were measured and compared with those simulated using the finite-element method with the characterization results. The close agreement between them confirmed the reliability of the characterization results.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 1","pages":"Pages 933-939"},"PeriodicalIF":5.1,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143178242","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

Study on the transformation of diamond into graphene through high-temperature annealing

IF 5.1 2区材料科学

Ceramics International Pub Date : 2025-01-01 DOI: 10.1016/j.ceramint.2024.11.279

Xiaogang Li , Xueyu Zhang , Ying Ren , Nicolas Wöhrl , Wei Lv , Honglin Wang , Zhengxin Li

{"title":"Study on the transformation of diamond into graphene through high-temperature annealing","authors":"Xiaogang Li , Xueyu Zhang , Ying Ren , Nicolas Wöhrl , Wei Lv , Honglin Wang , Zhengxin Li","doi":"10.1016/j.ceramint.2024.11.279","DOIUrl":"10.1016/j.ceramint.2024.11.279","url":null,"abstract":"<div><div>The carbon allotropes, diamond and graphene, possess distinctly properties that can be effectively harnessed by combining them into a graphene-diamond composite structure. However, the growth mechanisms of graphene or solid carbon source graphite from surface graphitization of diamond remains poorly understood. In this study, the graphene growth directly out of polycrystalline diamond by employing high-temperature annealing with Cu as a catalyst. After annealing at 1100 °C for 15–30 min, the resulting surface film layer exhibited typical features of graphene in Raman spectra. I<sub>2D</sub>/I<sub>G</sub> values of 0.61 and 0.63 were observed, respectively, indicating that a graphene layer count exceeding four. Furthermore, the parallel growth of graphene on diamond surface was successfully observed using TEM. Reconstruction of two different types of graphene-diamond composite structures, constructed from lamellar and sp<sup>3</sup> and sp<sup>2</sup> bonds, is comprehensively elucidated. These structures are expected to synergistically combine the ultra-hard characteristics of diamond with the high fracture toughness and ductility of graphene.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 3","pages":"Pages 3029-3036"},"PeriodicalIF":5.1,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143161228","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

One dimensionally arranged CoMoO4 an electrocatalyst for methanol assisted hydrogen production and supercapacitor applications

IF 5.1 2区材料科学

Ceramics International Pub Date : 2025-01-01 DOI: 10.1016/j.ceramint.2024.11.259

Khalid Aljohani , Bassam S. Aljohani , Nabi Ullah , Sayyar Ali Shah , Sufaid Shah

{"title":"One dimensionally arranged CoMoO4 an electrocatalyst for methanol assisted hydrogen production and supercapacitor applications","authors":"Khalid Aljohani , Bassam S. Aljohani , Nabi Ullah , Sayyar Ali Shah , Sufaid Shah","doi":"10.1016/j.ceramint.2024.11.259","DOIUrl":"10.1016/j.ceramint.2024.11.259","url":null,"abstract":"<div><div>Energy crisis and environmental protection are primary concerns of modern societies. Electrocatalytic water splitting to produce hydrogen is an ideal protocol, but sluggish OER reduces the efficiency. In this regard, one-dimensionally arranged CoMoO<sub>4</sub> nanorods are developed and applied for MOR (an alternative to OER), HER, and supercapacitor applications. The electrocatalyst shows excellent response for multiple electrochemical applications. It delivers a current density of 10 mA/cm<sup>2</sup> at 1.64 V vs RHE for MOR, with a Tafel slope of 100.6 mV/dec. The electrocatalyst demonstrates the superiority of MOR by reducing the onset potential and overpotential by 150 mV and 60 mV, respectively, compared to OER. The CoMoO<sub>4</sub> electrocatalyst also shows good performance for HER, delivering a current density of 10 mA/cm<sup>2</sup> at a potential of −0.42 V vs RHE, with a Tafel slope of 107.2 mV/dec. The material exhibits excellent performance as a supercapacitor, delivering a specific capacitance of 117.84 F/g, an energy density of 5.89 Wh/kg and a power density of 316.82 W/kg at a current density of 1 A/g. The material also shows excellent stability for MOR (8000 s), HER (8000 s), and supercapacitor (500 CV cycles), retaining 67 %, 94 %, and 88.5 % efficiency, respectively, with excellent ECSA of 4.85 mF/cm<sup>2</sup>.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 3","pages":"Pages 2821-2829"},"PeriodicalIF":5.1,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143159916","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

Competitive reaction behavior and formation mechanism of reactively spark plasma sintered TiB2-TiC composite ceramics with tunable compositions

IF 5.1 2区材料科学

Ceramics International Pub Date : 2025-01-01 DOI: 10.1016/j.ceramint.2024.11.255

Jian Tang , Xin Li , Chen Xu , Shilun Chang , Xingguo Wang , Youjun Lu , Hongfang Shen

{"title":"Competitive reaction behavior and formation mechanism of reactively spark plasma sintered TiB2-TiC composite ceramics with tunable compositions","authors":"Jian Tang , Xin Li , Chen Xu , Shilun Chang , Xingguo Wang , Youjun Lu , Hongfang Shen","doi":"10.1016/j.ceramint.2024.11.255","DOIUrl":"10.1016/j.ceramint.2024.11.255","url":null,"abstract":"<div><div>TiB<sub>2</sub>-TiC composite ceramics with tunable compositions (70 wt% < TiB<sub>2</sub> < 100 wt%) were fabricated by the reactive spark plasma sintering (SPS) technique using Ti, B<sub>4</sub>C, and TiB<sub>2</sub> as raw materials. The effects of sintering temperature and holding time on the densification, electrical, and mechanical properties of composite ceramics were investigated. Additionally, the competitive reaction behavior of the Ti-B<sub>4</sub>C-TiB<sub>2</sub> ternary system and the formation mechanism of TiB<sub>2</sub>-TiC composite ceramics were systematically highlighted, respectively. The TiB<sub>2</sub>-TiC composite ceramics successfully obtained 98.9 % relative density, 8.0 ± 0.3 μΩ∙cm electrical resistivity, and 6.8 ± 0.2 MPa∙m<sup>1/2</sup> fracture toughness at the sintering temperature of 1800 °C, pressure of 35 MPa, and holding time of 5 min. As the sintering temperature was increased in the Ti-B<sub>4</sub>C-TiB<sub>2</sub> ternary system, competitive reactions occurred not only between Ti and B<sub>4</sub>C as well as between Ti and TiB<sub>2</sub> reactants, but also between B<sub>4</sub>C and in-situ generated TiC, accompanied by the formation of TiB and free carbon in the system. The enhancement of fracture toughness could be attributed to the generation of TiB. Meanwhile, the establishment of a conductive network, which was promoted by the presence of free carbon, resulting in significant reduction in electrical resistivity. However, as a consequence of the deformation and dissociation of the free carbon, a reduction in the load-bearing cross-section resulted in a corresponding reduction in the flexural strength of the composite ceramic.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 3","pages":"Pages 2779-2789"},"PeriodicalIF":5.1,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143159925","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 relationships and thermal behavior of one-pot synthesized dual-phase BaCe0.5Fe0.5O3–δ composites

IF 5.1 2区材料科学

Ceramics International Pub Date : 2025-01-01 DOI: 10.1016/j.ceramint.2024.11.324

Liana R. Tarutina , Polina S. Kuznetsova , Lubov S. Skutina , Anna A. Murashkina , Dmitry A. Medvedev

{"title":"Phase relationships and thermal behavior of one-pot synthesized dual-phase BaCe0.5Fe0.5O3–δ composites","authors":"Liana R. Tarutina , Polina S. Kuznetsova , Lubov S. Skutina , Anna A. Murashkina , Dmitry A. Medvedev","doi":"10.1016/j.ceramint.2024.11.324","DOIUrl":"10.1016/j.ceramint.2024.11.324","url":null,"abstract":"<div><div>The synthesis of self-assembled composite materials via a one-pot technique offers a promising strategy for designing modernized electrodes for use in solid oxide electrochemical cells based on both oxygen-ionic and proton-conducting electrolytes. Within the present work, a BaCe<sub>0.5</sub>Fe<sub>0.5</sub>O<sub>3–δ</sub> composite (extensively investigated in the literature as a triple conductor) was prepared as both dense and porous ceramics. The thermal properties of these materials were subsequently characterized via a range of complimentary techniques, including high-temperature X-ray diffraction, thermogravimetry, and dilatometry analyses. The employed methods allow for the refinement of the compositions for both Ce- and Fe-enriched phases, as well as the determination of the thermal expansion behaviors of both the basic components and the composite as a whole. The experimental results demonstrate that the Ce- and Fe-based phases exhibit markedly disparate thermomechanical responses, which represents a significant limitation for the joint application of BaCe<sub>0.5</sub>Fe<sub>0.5</sub>O<sub>3–δ</sub>-derived electrodes with a range of electrolyte representatives. While the thermomechanical discrepancy can be reduced for the porous state of the electrodes, greater attention should be paid to the microstructural integrity of such electrodes and the quality of the electrolyte/electrode interface under long-term and cycling operating conditions. Therefore, this work provides complementary information on the various functional properties of dual-phase BaCe<sub>0.5</sub>Fe<sub>0.5</sub>O<sub>3–δ</sub> composites.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 3","pages":"Pages 3471-3481"},"PeriodicalIF":5.1,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143160430","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

Thin alumina wafer fabrication by vat photopolymerisation based additive manufacturing

IF 5.1 2区材料科学

Ceramics International Pub Date : 2025-01-01 DOI: 10.1016/j.ceramint.2024.11.266

Seema Negi , Parag Bhargava , Prasanna S. Gandhi

{"title":"Thin alumina wafer fabrication by vat photopolymerisation based additive manufacturing","authors":"Seema Negi , Parag Bhargava , Prasanna S. Gandhi","doi":"10.1016/j.ceramint.2024.11.266","DOIUrl":"10.1016/j.ceramint.2024.11.266","url":null,"abstract":"<div><div>In VAT Photopolymerization (VP), a ceramic slurry is cured layer by layer under light (200–760 nm) to fabricate ceramic parts from a 3D CAD model. Lithography-based Ceramic Manufacturing (LCM) a VP process presents a significant advancement over traditional tape-casting methods in the production of thin ceramic substrates. While tape casting is limited in its ability to produce substrates in a single step, with thickness in the range of 100s of microns, typically necessitating the lamination of multiple tapes to achieve greater thicknesses. LCM overcomes this limitation, and it offers precise control over layer thicknesses, ranging from 10 to 100 microns, and is capable of directly printing substrates in the range of several hundred microns. This capability not only streamlines the manufacturing process but also ensures more consistent quality and greater flexibility in substrate thickness, making LCM a superior technique for producing thin ceramic substrates. However, the main challenge in LCM is to make these substrates without any warpage. This study aims to nail down the root cause of the warpage by employing various characterization techniques (including FTIR, nano-indentation, SEM and TGA), and by identifying factors that contribute to the warpage. It is observed that layer-wise fabrication leads to a curing gradient owing to the multiple exposures of already cured layers, causing the final layers to cure less than the initial ones. Due to this, mechanical properties such as hardness and modulus are significantly different for the initial and final layers. In thin parts (<300 microns), a significant proportion of under-cured layers contribute to pronounced warpage. To make a warpage-free substrate, a post-curing strategy is proposed and examined. It is concluded that 80 % of the warpage can be reduced by the proposed post-curing method.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 3","pages":"Pages 2891-2897"},"PeriodicalIF":5.1,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143160628","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

Synergistic enhancement effect on surface Au nanoparticles decoration on Co-doped SnO2 nanobelts: High-response and selection for VOC gas sensing

IF 5.1 2区材料科学

Ceramics International Pub Date : 2025-01-01 DOI: 10.1016/j.ceramint.2024.11.263

Ke Liu, Jun Zhang

{"title":"Synergistic enhancement effect on surface Au nanoparticles decoration on Co-doped SnO2 nanobelts: High-response and selection for VOC gas sensing","authors":"Ke Liu, Jun Zhang","doi":"10.1016/j.ceramint.2024.11.263","DOIUrl":"10.1016/j.ceramint.2024.11.263","url":null,"abstract":"<div><div>The surface of Au nanoparticles (NPs) modified materials can greatly improve the physical and chemical properties of materials. Herein, enabling excellent sensing performances via the decoration of Au NPs on 0.5 wt% Co-doped SnO<sub>2</sub> nanobelts (NBs) sensors is demonstrated. After decorating the content of Au NPs into three different ratios by controlling different sputtering times, denoted by Au-Co-SnO<sub>2</sub>-1, Au-Co-SnO<sub>2</sub>-1.5, and Au-Co-SnO<sub>2</sub>-2, respectively. According to the characterization results, the Au-Co-SnO<sub>2</sub>-1.5 based sensor exhibits the best gas sensing performances, for example, it achieves the highest response, which is nearly twenty times from 41 to 793, while the optimal operating temperature is reduced from 340 °C to 280 °C, and the response and recovery times have been reduced from 66 s to 63 s–44 s and 31 s in comparison with the pure SnO<sub>2</sub> based sensor for 50 ppm 1-butanol. The morphological and microstructural properties of these NBs were analyzed through X-ray diffraction (XRD), Raman spectroscopy, Scanning electron microscopy (SEM), Brunauer–Emmet–Teller (BET) nitrogen adsorption–desorption isotherms measurement and X-ray Photoelectron Spectroscopy (XPS). The XPS results show that the corresponding response magnitude is positively correlated with the proportion of adsorbed oxygen. On the basis of the investigation, the mechanism for enhanced gas sensing performances of Au-Co-SnO<sub>2</sub>-1.5 based sensor can be primarily ascribed to the synergistic effect of increasing surface-active sites caused by oxygen vacancies, promoting the formation of additional adsorbed oxygen.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 3","pages":"Pages 2861-2870"},"PeriodicalIF":5.1,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143160634","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

Electron-lattice coupling and double exchange effects to improve TCR of La0.67-xNdxCa0.25Sr0.08MnO3 films grown on La0.3Sr0.7Al0.65Ta0.35O3 substrates

IF 5.1 2区材料科学

Ceramics International Pub Date : 2025-01-01 DOI: 10.1016/j.ceramint.2024.11.300

Zihao Chen , Xiaolu Liang , Zimeng Pan , Zhenyu Wang , Yao Wang , Haitao Wang , Jiachen Wang , Jiankun Sun , Jun Ma , Xuexing Jiang , Jubo Peng , Xin Gu , Jing Zhang , Xiang Liu

{"title":"Electron-lattice coupling and double exchange effects to improve TCR of La0.67-xNdxCa0.25Sr0.08MnO3 films grown on La0.3Sr0.7Al0.65Ta0.35O3 substrates","authors":"Zihao Chen , Xiaolu Liang , Zimeng Pan , Zhenyu Wang , Yao Wang , Haitao Wang , Jiachen Wang , Jiankun Sun , Jun Ma , Xuexing Jiang , Jubo Peng , Xin Gu , Jing Zhang , Xiang Liu","doi":"10.1016/j.ceramint.2024.11.300","DOIUrl":"10.1016/j.ceramint.2024.11.300","url":null,"abstract":"<div><div>In this study, La<sub>0.67−<em>x</em></sub>Nd<sub><em>x</em></sub>Ca<sub>0.25</sub>Sr<sub>0.08</sub>MnO<sub>3</sub> (LNCSMO, <em>x</em> = 0.09, 0.10, 0.11, 0.12) films were prepared by sol-gel spin coating method. The results indicate that the LNCSMO film is oriented and grown on a La<sub>0.3</sub>Sr<sub>0.7</sub>Al<sub>0.65</sub>Ta<sub>0.35</sub>O<sub>3</sub> (LSATO) (00<em>l</em>) substrate. In addition, with the increase of Nd<sup>3+</sup> content, the Mn-O bond length (<em>d</em><sub>Mn-O</sub>) and Mn-O-Mn bond angle (<em>θ</em><sub>Mn-O-Mn</sub>) decreases. The concentration ratio of Mn<sup>4+</sup> increases firstly and then decreases, and resulting in an enhanced and then weakened double exchange (DE) effect. Measuring the variation of sample resistivity with temperature (<em>ρ</em>-T) using the standard four-probe method. As the content of Nd<sup>3+</sup> increases, the metal-insulator transition temperature (<em>T</em><sub>p</sub>) gradually decreases, and the resistivity (<em>ρ</em>) gradually increases. The replacement of Nd<sup>3+</sup> makes the peak temperature coefficient of resistivity value (<em>TCR</em><sub>max</sub>) of the material firstly increase and then decrease. At <em>x</em> = 0.11, the <em>TCR</em><sub>max</sub> reaches 34.28 % K<sup>−1</sup> at 254.72 K. This provides new insights into the impact of Nd doping on electrical transport properties.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 3","pages":"Pages 3234-3242"},"PeriodicalIF":5.1,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143161269","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

Plasma formation during flash sintering of boron carbide – Part II: Effect on sintering and optimisation of process variables

IF 5.1 2区材料科学

Ceramics International Pub Date : 2025-01-01 DOI: 10.1016/j.ceramint.2024.11.314

Christian Bechteler , Sudarshan Narayanan , Richard I. Todd

{"title":"Plasma formation during flash sintering of boron carbide – Part II: Effect on sintering and optimisation of process variables","authors":"Christian Bechteler , Sudarshan Narayanan , Richard I. Todd","doi":"10.1016/j.ceramint.2024.11.314","DOIUrl":"10.1016/j.ceramint.2024.11.314","url":null,"abstract":"<div><div>Field assisted sintering techniques, such as Flash Sintering (FS), allow rapid heating and densification of ceramics within seconds at significantly reduced environmental temperatures. FS of oxides has been extensively researched since 2010, whereas the potential densification of non-oxides such as carbides is rarely investigated. In the first part of this investigation the atmospheric breakdown and plasma formation under FS-conditions relevant to SiC and B<sub>4</sub>C was researched. In the present work, the FS of B<sub>4</sub>C was investigated with and without plasma formation for comparison, and the influence and optimum combination of the other main FS-parameters determined. The results showed that at a furnace temperature of 1500 °C, it is possible to densify B<sub>4</sub>C by DC FS with or without an initial plasma formation. However, though plasma formation did not itself lead to densification of the material, the plasma-induced removal of the B<sub>2</sub>O<sub>3</sub>-layer on the surface of the powder led to a significant improvement in subsequent densification during FS. The effect of the Ar-plasma generated in removing the surface oxide from B<sub>4</sub>C-particles was confirmed by SEM and XPS. Other process variables such as carbon additives, thermal insulation and hold time also significantly influenced the densification of B<sub>4</sub>C by FS. With the optimised conditions, 96 % dense B<sub>4</sub>C, with a grain size of 10 μm and a hardness of 31 GPa (HV1) was produced by pressureless FS in 5 min at a furnace temperature of 1500 °C.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 3","pages":"Pages 3370-3382"},"PeriodicalIF":5.1,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143161383","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Microstructure evolution of MAB-phase WAlB during helium irradiation and post-irradiation annealing

IF 5.1 2区材料科学

Ceramics International Pub Date : 2025-01-01 DOI: 10.1016/j.ceramint.2024.11.143

Zizhao Wang , Shan Qin , Jie Gao , Jiangjiang Mao , Meng Wang , Bo Xin , Liqun Shi

{"title":"Microstructure evolution of MAB-phase WAlB during helium irradiation and post-irradiation annealing","authors":"Zizhao Wang , Shan Qin , Jie Gao , Jiangjiang Mao , Meng Wang , Bo Xin , Liqun Shi","doi":"10.1016/j.ceramint.2024.11.143","DOIUrl":"10.1016/j.ceramint.2024.11.143","url":null,"abstract":"<div><div>Ternary nano-laminated MAB phase WAlB has demonstrated exceptional neutron and gamma-ray shielding capacities, a property that can be attributed to its high atomic contents of tungsten (W) and boron (B). However, the substantial helium (He) production resulting from the reaction between neutrons and B elements makes WAlB susceptible to the potential damage of He effects that have been widely recognized in nuclear structural materials. Here, we report the first investigation on the microstructural evolution of WAlB induced by He ions irradiation and post-irradiation annealing. The irradiation-induced amorphization and annealing-activated epitaxial recrystallization of WAlB were revealed by the transmission electron microscope (TEM) and Raman spectroscopy. He behavior in the irradiated WAlB was quantitatively analyzed using elastic recoil detection analysis (ERDA). The annealing-induced alterations in He concentration depth profiles suggested the remarkable temperature-dependent characteristics of He migration behavior in crystalline and amorphous structures within WAlB.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 2","pages":"Pages 1674-1681"},"PeriodicalIF":5.1,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143167557","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