CERAMICS INTERNATIONAL
·
2026
·
IF 6
Jiawen Wu,Yujie Xie,Fangyi Shen,Tiangong Cheng,Zhongcai Wu,Chujun Wang,Yizhi Liu,Yongzhen Feng,Hui Zheng
Conventional solid-state sintering of M-type hexaferrites requires high temperatures and long durations yet often yields inadequate density and coarse grains, limiting functional performance. This limitation is overcome by hot pressing, which applies uniaxial pressure synergistically with a transient liquid phase. This strategy enables rapid densification at a substantially lower temperature of 975 °C, in contrast to over 1100 °C for conventional methods. The resulting ceramics achieve near theoretical density exceeding 98% (98.03-98.22%), a fine-grained uniform microstructure, and superior structural integrity ( R wp = 2.50-2.83%), properties unattainable by standard sintering. The hot-pressing process also leads to oxygen vacancy reorganization. Consequently, the materials exhibit comprehensively enhanced properties: the optimal composition achieves a high coercivity of 1672.8 Oe, and low dielectric loss (ε″ ≈ 0.93 at 1 MHz) with excellent temperature stability (Δε' as low as 9.23). This work establishes hot pressing as a superior alternative and elucidates the underlying pressure assisted densification and valence modulation mechanism, providing a new design principle for engineering high performance microwave ferrites.
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CERAMICS INTERNATIONAL
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2026
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IF 6
Mengwen Zhang,Fanyu Meng,Xiaoyu Chen,Na Cao,Lei Fan,Shoulei Yang
High-performance ceramic cutting tools require superior hardness and toughness under extreme temperatures; yet conventional sintering methods for Al 2 O 3 -Ti(C,N) composites often suffer from incomplete densification and grain coarsening. In this study, dynamic sinter forging (DSF) with oscillatory pressure amplitudes of 40 ± 40 MPa at 1600 °C is employed to regulate the densification behaviour and microstructural evolution of Al 2 O 3 -Ti(C,N) composites. The composite achieves a relative density above 99.9%, flexural strength of 1111 MPa, and hardness of 24.5 GPa at 15 Hz. A maximum fracture toughness of 5.44 MPa m 1/2 is obtained at 10 Hz. Microstructural observations reveal that moderate-frequency oscillation activate interfacial diffusion and stress-assisted plastic flow, promoting grain-boundary sliding and compact bonding to form a fine-grained and homogeneous structure. These results confirm that frequency-controlled DSF facilitates simultaneous enhancement of strength and toughness, providing a valid route for fabricating high-performance Al 2 O 3 -based cutting ceramics with optimized microstructural designs.
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APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2024
·Vol. 130
·期 4
·1-14
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IF 2.5
Guo Chenxi,Yang Xin,Zhang Xiaxiang,Li Hongtao,Liao Mingdong,Huang Qizhong
To shorten the manufacturing process and enhance the ZrC content, C/C-SiC-ZrC composites were prepared using the nano-filler slurry infiltration method in combination with precursor infiltration and pyrolysis method. The effect of ZrC filler sizes on densification, microstructure, and properties of composites was studied. Results revealed that the ZrC content and density of the C/C-SiC-ZrC composites are inversely correlated to the filler size. The composites with nano-fillers reach the highest density of 2.67 g cm −3 as well as the lowest open porosity of 1.21%. After being ablated under oxyacetylene flame for 60 s, the composites with nano-fillers owns the lowest linear ablation rate and surface temperature, with 10 μms −1 and 2700 °C. Due to the highest ZrC content and best film-forming ability of nano-fillers, ZrO 2 outer layer with the densest structure can provide an enhanced protective effect, and the thickness of the oxide layer decreases from 509 to 264 μm as compared with micron fillers. Therefore, the oxidation damage of the composites is reduced, and the thickness of the SiC depletion layer decreases simultaneously. The above results further demonstrate that introducing ZrC nano-filler to the C/C-SiC-ZrC composites can considerably improve their ablative properties at 2700 °C.
研究领域:
材料科学
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纳米技术
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2024
·Vol. 35
·期 11
·1-12
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IF 2.8
Yang Zaizhi,Wang Xi,Zhang Liang,Li Hailing,Zhang Hui,Xu Dong
Flash sintering is considered a promising energy-saving and efficient technology for preparing high-temperature ceramics. The effects of limited current on flash sintering parameters, microstructure, and electrical properties of (La 1/2 , Ta 1/2 ) 0.02 Ti 0.98 O 2 ceramic were investigated by the XRD, SEM, XPS, and precision impedance analyzer. With limiting current increase, the grain size of flash sintering sample increases gradually, and the relative density increases first and then decreases. The average grain size is about 1 μm, and the highest relative density is 96.9%. Joule heating runaway and oxygen vacancy defect lead to rapid densification of flash sintering La and Ta co-doped TiO 2 ceramics. According to the EPDD model, doped La 3+ and Ta 5+ ions increase the concentration of oxygen vacancies and free electrons, lead to local polarization of carriers, and obtain a giant dielectric constant of ε ’ = 7.6 × 10 4 and low dielectric loss of tanδ = 0.11. At high temperature, electrons break free from the constraints of defect clusters and accumulate at the interface, leading to interface polarization due to the IBLC model. The giant dielectric properties originate from the combined effect of EPDD and IBLC model.
研究领域:
材料科学
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陶瓷工程
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电气工程
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JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
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2025
·
IF 6.2
Xin Zhou,Yongxia Yao,Xian Tong,Zengqi Ye,Jiancheng Yu,Yue Huang,Zhaoping Chen,Weiqu Wang,Li Zhu,Jixing Lin,Zhe Zhao,Jianfeng Ma
In this study, lithium disilicate glass-ceramic green bodies were prepared using digital light processing technology, utilizing a precursor slurry with good rheological and photocuring properties. The green bodies underwent debinding, nucleation, and crystallization, followed by densification at the glass melting temperature. We investigated the effects of crystallization time and densification time on the microstructure, mechanical properties, translucency, chemical solubility, and cytotoxicity of the glass-ceramics. The results showed that precise control of densification balanced internal defects and molding quality. Increased crystallization and densification times significantly improved crystallinity, density, flexural strength, and translucency. However, fracture toughness was only enhanced by crystallization time, with intergranular being the fracture main mode. The preferred samples exhibited strength, toughness, and translucency parameters of 284.5 MPa, 2.3 MPa·m 1/2 , and 12.3, respectively. Additionally, these samples showed good resistance to cold and hot aging, chemical solubility, and cytocompatibility, meeting the clinical requirements for dental restorations.
研究领域:
材料科学
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生物医学工程
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口腔医学
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JOURNAL OF MATERIALS SCIENCE
·
2025
·Vol. 60
·期 7
·3392-3407
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IF 3.9
Wang Xuewen,Zhao Jie,Shi Qingwen,Li Peibo,Luo Guoqiang,Shen Qiang,Sun Yi
Metal electrodes of crystalline silicon solar cells need to possess good photoelectric conversion properties and play a critical role in converting solar energy into electrical energy, making it particularly important to obtain highly conducive, cost-effective and chemically stable materials. This paper prepared uniformly silver-coated copper powders (Cu@Ag) via electroless plating and a conductive film with low sheet resistance by air oxidation combined with hydrogen reduction sintering (jointly referred to as oxidation–reduction sintering). In addition, the densification mechanism of the Cu@Ag conductive film during sintering was revealed. Results showed that oxidation–reduction sintering promoted the diffusion between Cu and Ag, enhancing the plastic flow of phases and improving the densification of the conductive film. Moreover, the densification of the conducive films was further improved by designing multiple layers. The sheet resistance of the four-layer Cu@Ag conductive film was reduced to 1.5 mΩ/□ at 700 °C, while that of the four-layer Cu@Ag conductive film increased by only 0.6 mΩ/□ at 200 °C after eight days, much more stable than Cu film. This work demonstrates the tremendous potential of oxidation-resistant Cu@Ag conductive pastes in low-cost photovoltaic cells, electronics, and other commercial applications. Graphical
研究领域:
材料科学
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太阳能技术
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电子工程
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CHEMICAL ENGINEERING JOURNAL
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2024
·
IF 13.3
Qi Liu,Pei-Lin Wang,Wei Zhang,Tian Mai,Meng-Yu Qi,Lei Chen,Junfeng Li,Ming-Guo Ma
In the era of increasing reliance on electronic devices, the development of flexible smart composite films that offer multifunctional capabilities such as electromagnetic shielding, sensing, infrared stealth, and autonomous heating is becoming increasingly significant. In this study, we fabricated polydopamine-modified cellulose scaffold/MXene composite films (PCM) using a densification strategy, resulting in films with a thickness of only 33 μm, outstanding tensile strength of 235.28 MPa, and excellent electromagnetic shielding effectiveness of 44.6 dB. The PCM also demonstrates remarkable electrothermal performance, reaching temperatures of up to 610 °C at 5 V, and exhibits excellent photo-thermal conversion performance, along with good cycling stability and tunability. Additionally, the PCM’s low infrared emissivity provides it with exceptional infrared stealth capabilities, effectively concealing a high surface temperature ranging from 250 °C to 25 °C. The PCM’s ability to detect human body movement and light-driven actuation for bionic motions underscores its flexibility and utility as a sensor. Therefore, this efficient and versatile approach provides a promising method for synthesizing multifunctional MXene-based composite films, achieving satisfactory mechanical properties, high electromagnetic interference shielding, and effective thermal management for wearable smart devices and military applications.
研究领域:
材料科学
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智能设备
·
多功能材料
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INDUSTRIAL CROPS AND PRODUCTS
·
2024
·
IF 5.6
Jie Zhang,Lei zhang,Chao Lv,Li Gao,Xueqi Chen,Shupin Luo,Yongping Chen,Yiping Ren,Liang Chang,Wenjing Guo,Qiheng Tang
Lightweight, ultra-strength, and renewable MXene composite films with excellent electromagnetic interference (EMI) shielding characteristics have great application potential in next generation high-tech electronic devices. Herein, multifunctional high performance MXene/densified wood (MXene/DW) films were fabricated by vacuum immersion of Ti 3 C 2 T x MXene and Cu 2+ solution into delignified wood and then hot-pressing densification. The results show that the composite film has superior mechanical properties, and the tensile strength , tensile modulus , and toughness are 424.7 MPa, 14.6 GPa and 8.0 MJ·m −3 , respectively. The MXene/DW film exhibits excellent electrothermal conversion performance, making the film possess promising application in the fields of deicing and infrared stealth. Meanwhile, the wireless charging and electromagnetic induction luminescence application demonstration indicate that the MXene/DW film has great EMI shielding effect. The EMI SE value of MXene/DW films in X band (8.2–12.4 GHz) reaches 48 dB, which is much higher than commercial EMI materials (20 dB). At last, the MXene/DW film also has good electrochemical performances, making it also has potential applications in electrode materials. In summary, this work provides a feasible method for using renewable natural wood and MXene to prepare high-performance and multifunctional composite film, providing a new opportunity for developing sustainable wood as next-generation high-tech electronic devices.
研究领域:
材料科学
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电子工程
·
能源技术
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Journal of Materials Research and Technology-JMR&T
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2024
·
IF 6.2
M. Irfan Hussain,Min Xia,Xiao-Na Ren,Changchun Ge,Yunsong Zhao,Zhen Shen
High-precision microfabrication of functional ceramics with complex shapes and tailored properties currently arouse significant attention, but maintaining dimensional accuracy is still a research challenge. Herein, an innovative digital light processing (DLP) 3D technology is employed to fabricate calcined kaolin (Al 2 O 3 ·2SiO 2 ) ceramic with intricate structures, achieving high precision and densification. To illustrate the potential of different solid content slurries (43, 45, 46.2, and 47.5 vol%), and the curing thickness with tuned exposure time (8s, 10s, and 12s), we investigated their impact on physical properties and microstructures. The results show that the optimal sintering at 1200 °C achieved an exceptionally high density 2.38 g/cm 3 , with low shrinkage (17.35 %) along XY-direction and porosity reaching up to 15.53%. The highest level of solids slurry at 47.5 vol% increased the densification and open porosity. For all solid contents, the shrinkage along the Z-direction was exceeded compared to the XY-direction. A comprehensive evaluation of sintered morphologies, including their topography and chemical composition. The EDX mapping showed that kaolin ceramics have excellent stability at high temperatures. The highest flexural strength of DLP printed specimen at temperature (1200 °C) is 71.60 MPa, whereas that of the diamond porous structure is 6.66 MPa. Our work sheds light on high-precision microfabrication of complex shapes with unparalleled accuracy and efficiency, paving the way for high-performance functional ceramic materials.
研究领域:
材料科学
·
陶瓷工程
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European Journal of Wood and Wood Products
·
2023
·
IF 2.6
Liu Meihong,Lyu Shaoyi,Cai Liping,Lei Yafang,Peng Limin,Yan Li,Lyu Jianxiong
In this study, radiata pine wood was impregnated with furfuryl alcohol (FA) resin and radially compressed at compression ratios (CRs) of 17%, 33%, and 50%, respectively, to improve the acoustic and viscoelastic performance. The optimum CR was selected by analyzing the properties of FA-densified modified woods with different CRs. The storage modulus and loss factors of the FA-densified modified woods with CRs of 17%, 33%, and 50% were better than those of fretboard wood. The fretboard wood had an extremely high dynamic modulus of elasticity ( D′ \(\ge\) 16.22 GPa) and dynamic shear modulus ( G′ \(\ge\) 2.23 GPa). The D′ and G′ of the FA-densified modified wood with a CR of 50% were 25.44 GPa and 4.08 GPa, respectively, which are better than those of the fretboard wood. The common fretboard wood had a low sound velocity ( υ ), small specific dynamic elastic modulus ( \({E}_{sp}\) ), small sound radiation coefficient ( R ), and low acoustic conversion efficiency ( ACE ), along with a high acoustic impedance ( ω ) and high sound quality factor ( Q −1 ). The values of υ , \({E}_{sp}\) , R , ACE , ω , and Q −1 of the FA-densified modified wood with a CR of 50% were 4563 m/s, 19.9 GPa, 3.49 m 3 Pa −1 s −3 , 253, 5.70 10 6 (Pa s m −1 ), and 13.80 \(\times\) 10 −3 , respectively, meeting the performance requirements for fretboards and demonstrating the potential to replace fretboard wood in fretboard manufacturing. This research promotes the application of a fast-growing plantation wood for the manufacture of musical instruments and provides a good platform for its high-value utilization.
研究领域:
木材科学
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声学工程
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高影响因子
Materials Today Communications
·
2026
·
IF 4.9
Fei-Yue Qin,Li-Na Liu,Jing Duan,Chao Chang,Qian-Fei Ma,Yong-Qiang Qin,Chao-Yang Xin,Li-Ming Wang,Lu-Yao Xu,Liang Li,Wei Zhao
Plunger exposed length was used to tailor SPS processing of SiC ceramics. • Reducing the exposed length lowered resistance and advanced shrinkage onset. • Edge under-sintering was reduced without changing composition or schedule. • Residual edge oxides disappeared when the exposed length was decreased. • The balance between edge densification and center stability was clarified. In this work, SiC ceramics with Al 2 O 3 and CeO 2 sintering additives were prepared by spark plasma sintering (SPS). The exposed length of the upper plunger, H, was adjusted to 15, 12, and 9 mm by changing the relative position of the die assembly. The effect of H on densification, microstructure, and local mechanical properties was investigated. As H decreased from 15 to 9 mm, the initial system resistance decreased by about 19%, the onset shrinkage temperature decreased from 1631 ± 10 °C to 1535 ± 10 °C, and the relative density increased from 95.94% to 98.20%. This change in electrical response is considered to alter the current and Joule heat distribution in the graphite tooling, thereby improving the local sintering condition and liquid-phase-assisted densification near the sample edge. Accordingly, the edge of S-H15 was too porous for valid hardness measurement, whereas the S-H9 edge reached 22.91 ± 0.09 GPa. However, fine pores remained in the center of S-H9, where the hardness decreased to 19.75 ± 0.16 GPa. These results show that plunger exposed length is an important tooling parameter affecting regional densification during SPS of SiC ceramics. Download: Download high-res image (238KB) Download: Download full-size image
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Dezhao Meng,Fukang Chen,Xinyu Chen,Lishun Yang,Xing Zhao,Can Tian,Yuan Zhou,Li Jin,Vladimir Laletin,Chunlin Song,Yan Yan,Gang Liu
Ceramic materials with relaxor dielectric properties , expressed as (1- x )(0.94Na 0.5 Bi 0.5 TiO 3 -0.06LiTaO 3 )- x CaTiO 3 [(1- x )(NBT-LT)- x CT] with x values of 0.12, 0.15, 0.18, and 0.21, were synthesized through an A-site doping method to enhance energy storage capabilities. The linear dielectric CaTiO 3 was chosen as the acceptor additive, and ceramic samples were prepared using conventional solid-phase and molding techniques. A comprehensive investigation evaluated the influence of different CT concentrations on the phase and energy storage/release characteristics of NBT-LT. Optimal performance was notably achieved with a 15% CT doping concentration, resulting in W rec and η values of 2.16 J/cm³ and 70%, respectively, for a 100 μm thick sample under a 210 kV/cm voltage. When the film was rolled to a 60 μm thickness, the voltage strength increased to 330 kV/cm, leading to enhanced W rec (5.33 J/cm³) and η (80%). Within the temperature range of 30 °C to 150 °C, only a marginal change in W rec (less than 10%) was observed. Frequency conversion tests across the 1 Hz to 100 Hz range demonstrated the material's relative stability, with W rec exhibiting minimal fluctuations. These findings emphasize the outstanding temperature and frequency stability of the material. During discharge, the material displayed a power density of up to 152 MW/cm³, coupled with a discharge time of 0.3 μs, showcasing remarkable pulse discharge capabilities. The experimental results affirm the promising potential of (NBT-LT)-0.15CT lead-free relaxor ferroelectric ceramics for application in commercial capacitors.
研究领域:
材料科学
·
电子工程
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危险品化学品经营许可证（带存储）