CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Naiqiang Wang,Xiaoqing Si,Baiqi Zhang,Jianwei Gao,Mingsheng Li,Tong Lin,Rui Li,Chun Li,Junlei Qi,Jian Cao
A novel sintered-joining of Al 2 O 3 and AlN is achieved for the first time using micro-Ag particle interlayers in air. In comparison with reactive air brazing , this method addresses the issue of reduced strength caused by air holes in brazed joints . Also, this sintered-joining method can be performed at a lower temperature (920 °C), improving the joint strength by relieving the residual stresses. The sintering effect of micro-Ag particles and their high density of dislocations promote the recovery and recrystallization of the Ag interlayer, as well as the interdiffusion of Ag and ceramic. Ag–O clusters formed at the interface can be embedded into oxygen vacancies on the ceramic surface, playing a key role in interfacial joining. By optimizing joining temperature, assembly pressure and holding time, a maximum joint shear strength of 85.2 MPa is achieved at 920 °C for 30 min with an assembly pressure of 1 MPa. This study successfully prepares Al 2 O 3 /AlN joints with excellent mechanical properties, providing a reliable foundation for the fabrication of power integrated circuits with efficient operation.
研究领域:
材料科学
·
陶瓷工程
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产品关联
DOI
高影响因子
Journal of Environmental Sciences
·
2017
·
IF 2.865
Lijie Zhou,Weiqin Zhuang,Xin Wang,Ke Yu,Shufang Yang,Siqing Xia
The study aims to identify the potential acute effects of suspended aluminum nitride (AlN) nanoparticles (NPs) on soluble microbial products (SMP) of activated sludge . Cultured activated sludge loaded with 1, 10, 50, 100, 150 and 200 mg/L of AlN NPs were carried out in this study. As results showed, AlN NPs had a highly inverse proportionality to bacterial dehydrogenase and OUR, indicating its direct toxicity to the activated sludge viability. The toxicity of AlN NPs was mainly due to the nano-scale of AlN NPs. In SMP, AlN NPs led to the decrease of polysaccharide and humic compounds, but had slight effects on protein. The decrease of tryptophan-like substances in SMP indicated the inhibition of AlN NPs on the bacterial metabolism. Additionally, AlN NPs reduced obviously the molecular weight of SMP, which might be due to the nano-scale of AlN.
研究领域:
环境科学
·
微生物学
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DOI
PubMed
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2023
·
IF 5.7
Wenxin Du,Kailei Lu,Bing He,Xiaolan Zhou,Xu Huang,Jianqi Qi,Tiecheng Lu
In this work, transparent aluminate oxynitride (AlON) ceramic wafers were successfully fabricated by the direct non-aqueous tape casting of Al 2 O 3 /AlN slurry and the one-step reaction sintering for the first time. The reaction sintered AlON ceramic wafer exhibits high transmittance of 73.2 % at the wavelength of 1600 nm. This fabricating route realizes smooth and flexible tape without cracks or pinholes in Al 2 O 3 /AlN system and efficiently shortens the preparation cycle of transparent AlON wafers, which is a feasible way to prepare high-quality transparent AlON ceramics with large lateral sizes and thin thicknesses by reaction sintering, might also promote the application of transparent AlON ceramic wafers.
研究领域:
材料科学
·
陶瓷工程
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Zhao Feng,Xiaolan Zhou,Pan Min,Hailong Li,Hong Liu,Yuntao Cheng
The intricate preparation process and prohibitively high manufacturing costs have long constrained the research and application of transparent ceramics. This study presents a straightforward, low-cost pressureless direct solid-state reaction sintering method, through which highly transparent AlON ceramics with optical properties comparable to those produced by conventional two-step methods were successfully fabricated. In this study, we found that AlN played a critical role in the sintering behavior of the Al 2 O 3 -AlN solid solution. The evolution of density and phase composition in the Al 2 O 3 -AlN solid solution with temperature revealed that the density reaches its maximum at ∼1250 °C, followed by a gradual decrease and eventual stabilization, which is due to volume expansion caused by the progressive formation of the AlON phase at ∼1650 °C. Before the complete phase transformation, the density of the solid solution decreased with increasing AlN content. Pure AlON phases were achieved when the Al 2 O 3 :AlN molar ratios were 9:3, 9:4, and 9:5, with similar densities. Microstructural examination and particle size distribution analysis revealed that variations in AlN content also affected the average grain size of the solid solution, demonstrating a non-monotonic trend characterized by an initial decrease (from ∼197.6 to ∼8.5 μm), a subsequent increase (to ∼135.8 μm), and a final decrease (to ∼7.3 μm). In contrast, hardness measurements demonstrated that the Vickers hardness decreased linearly with the increase of AlN content, from ∼19.5 to ∼13.2 GPa. Transmittance assessment indicated that the AlN content exerted a significant influence on the sintering temperature requisite for fabricating AlON transparent ceramics, with an increase in AlN content necessitating a correspondingly higher processing temperature. Finally, AlON ceramics with high optical transmittance of ∼82.3 % at 850 nm were achieved at temperatures of 1880 °C and 1900 °C for compositions with Al 2 O 3 to AlN ratios of 9:4 and 9:5, respectively.
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产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2026
·Vol. 47
·期 4
·118971
·
IF 6.3
Bin Fu,Tao Li,Zhirui Zhang,Haifeng Xu,Haoyang Wu,Wenjun Li,Baorui Jia,Xuanhui Qu,Mingli Qin
This study investigates how high-oxygen submicron AlN powders evolve during additive-free spark plasma sintering and how oxygen redistribution governs microstructure and properties. Fine AlN powder exhibited high sintering activity and rapid densification at lower temperatures. During sintering, surface and grain-boundary oxygen was redistributed and partially dissolved into the AlN lattice. At higher temperatures, the decrease in lattice oxygen was accompanied by the formation of crystalline Al-O-N (AlON) secondary phases. Oxygen incorporation and AlON precipitation reduced thermal conductivity and modified high-temperature resistivity. Flexural strength was mainly governed by grain refinement, while hardness was also influenced by AlON precipitation. The ceramics achieved maximum flexural strength (528 ± 32 MPa) and Vickers hardness(1451 ± 17.6 HV) after sintering at 1650 and 1700℃, respectively. These findings highlight the need to balance rapid densification and grain refinement against oxygen-induced thermal and electrical degradation when optimizing additive-free high-oxygen AlN ceramics.
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DOI
高影响因子
Materials
·
2024
·Vol. 17
·期 14
·3410
·
IF 3.1
Yixuan He,Xiaohong Wang,Ning Ding,Hai Jiang,Wenzhong Lu
Isobam is widely used for fabricating ceramics through spontaneous gelation and has attracted considerable interest. However, the disadvantage of the Isobam system is the low gelation strength. The effects of suitable additives and the mechanism by which they effectively enhance the green body strength and the rheological behavior of an aluminum nitride (AlN) slurry with 50 vol% solid loading were investigated using polyethyleneimine (PEI), hydantoin epoxy resin, and trimethylolpropane triglycidyl ether (TMPGE). Results showed that the additives acted as both dispersants and cross-linkers in the AlN suspension using the Isobam gelling system. The flexural strength of the AlN green body increased by 42%, 204%, and 268% with the addition of 1 wt% PEI, 1 wt% hydantoin epoxy resin, and 0.5 wt% TMPGE, respectively. After sintering at 1700 °C, the AlN ceramic with 0.5 wt% TMPGE had flexural strength and thermal conductivity of 235 MPa and 166.44 W/(m·K), respectively, showing superior performance to the ceramics without additives.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
DOI
PubMed
高影响因子
International Journal of Minerals Metallurgy and Materials
·
2025
·Vol. 32
·期 5
·1079-1090
·
IF 7.2
Li Xiang,Zhu Nengwu,Xi Yunhao,Li Fei,Zhang Pengfei
Secondary aluminum dross (SAD) is a rich source of recyclable aluminum but poses considerable risk due to its high AlN content. Therefore, thoroughly removing AlN is essential, but intricate aluminum components and expensive additives pose challenges to the process. In this study, waste sodium acetate is proposed as an environmentally friendly additive for completely removing AlN and enhancing the extraction of aluminum from SAD. Through the exothermic decomposition of NaAc, reactions can occur at 850°C. AlN removal efficiency reached 93.19% after sintering, whereas Al leaching efficiency in the subsequent leaching process reached 90.49%, which were 37.86% and 375.26% higher than the removal efficiency of the control, respectively. These favorable results were attributed to the comprehensive transformation of aluminum species. The formation of soluble phase Na 1.95 Al 1.95 Si 0.05 O 4 occurred during the destruction of the Al 2 O 3 layer surrounding AlN and the transformation of other aluminum components. AlN decomposed upon contact with NaAc. Therefore, this study utilizes the decomposition properties of NaAc to provide an efficient and environmentally friendly route for removing AlN and extracting Al from SAD.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2026
·
IF 8.3
Faxun Wang,Junyi Lin,Yuxuan Huang,Jiguang Zhao,Bing Tian,Liang Zhao,Bofeng Luo,Zhenliang Ye,Hao Yang,Guotao Duan
Reliable, drift-resistant monitoring of SF 6 enrichment in air near gas-insulated switchgear (GIS) leak points remains challenging for compact and low-cost sensing nodes. Here we report a thermal-conductivity-differential sensor enabled by a materials-circuit co-design: a hierarchical AlN@h-BN/MWCNT nanocomposite coating is integrated onto a Pt-coil element and read out by a Wheatstone bridge with a sealed reference arm and differential amplification. The ternary architecture exhibits a well-developed mesoporous framework with a high BET surface area (111.03 m 2 ·g −1 ), promoting efficient gas transport within the sensing layer and strengthening the thermal-conductivity-induced perturbation of the bridge balance. Under synthetic dry air (21% O 2 /79% N 2 ) at 25 ± 1℃, the output is monotonic over 0.1–5.0% SF 6 , with a recommended linear regime of 0.1–1.0% for quantitative readout; the baseline noise (σ air = 0.16 mV) yields an estimated LOD (3σ) of 0.0654% (∼654 ppm), while 0.1% is the lowest experimentally validated concentration. The optimized excitation voltage (3.0 V) maximizes response by balancing gas-phase modulation against increased non-gaseous heat losses at higher temperatures. The sensor shows reversible cycling (52/23 s response/recovery), humidity-tolerant operation (± 8% deviation over 20–80% RH), and < 5% degradation over 90 days; as expected for a TCD-type mechanism, cross-responses are governed by thermal conductivity rather than chemical selectivity.
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产品关联
DOI
高影响因子
Micromachines
·
2018
·Vol. 9
·期 10
·501
·
IF 2.222
Shuren Song,Da Chen,Hongfei Wang,Chaohui Li,Wei Wang,Wangli Yu,Yanyan Wang,Qiuquan Guo
Measurement of hemostatic parameters is essential for patients receiving long-term oral anticoagulant agents. In this paper, we present a shear mode bulk acoustic resonator based on an inclinedc-axis aluminum nitride (AlN) film for monitoring the human hemostatic parameters. During the blood coagulation process, the resonant frequency of the device decreases along with a step-ladder profile due to the viscosity change during the formation of fibers in blood, revealing the sequential coagulation stages. Two hemostatic parameters with clinical significance, prothrombin time (PT) along with its derived measure of international normalized ratio (INR), are determined from time-frequency curves of the device. Furthermore, the resonator is compared with a commercial coagulometer by monitoring the hemostatic parameters for one month in a patient taking the oral anticoagulant. The results are consistent. In addition, thanks to the excellent potential for integration, miniaturization and the availability of direct digital signals, the proposed device has promising application for point of care coagulation monitoring.Keywords:bulk acoustic wave;AlN film;hemostatic parameters;viscosity sensor
研究领域:
生物医学工程
·
临床检验学
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产品关联
DOI
PubMed
高影响因子
Journal of Asian Ceramic Societies
·
2022
·
IF 2.546
Hai Jiang,Ning Ding,Zheng-Yu Zou,Xiao-Hong Wang
The effect of ZnO on phase composition, microstructure, thermal and dielectric properties of AlN ceramics was studied. The X-ray diffraction indicated that ZnAl2O4 and ZnO phases were detected in samples. With 0.5 wt% ZnO added, the thermal conductivity of AlN sample increased to 193.7 W/m·K. Whereas, the thermal conductivity dropped sharply due to excess ZnO. Moreover, the addition of ZnO increased the permittivity and altered the relaxation mechanism of AlN ceramics. The fitting data and activation energy from impedance spectroscopy revealed the variation of defect mechanisms in samples. The addition of 0.5 wt% ZnO reduced the concentration of aluminum vacancy in AlN grains to improve thermal conductivity. Nevertheless, excess ZnO dissolved into the AlN lattice and created additional defects, causing the decrease in thermal conductivity and electrical resistivity for AlN ceramics. Overall, suitable addition of ZnO can effectively increase the thermal conductivity and alter the dielectric properties of AlN ceramics.
研究领域:
材料科学
·
陶瓷工程
·
电气工程
✓ 已验证
产品关联
DOI
高影响因子
WOOD SCIENCE AND TECHNOLOGY
·
2023
·Vol. 57
·期 3
·717-739
·
IF 3.4
Li Yanchen,Zhang Weiye,Sun Jingmeng,Fang Xiaoyang,Wang Beibei,Li Fangzhou,Zhang Daihui,Guo Hongwu,Liu Yi
Wood is a great natural material with good energy storage and temperature adjustment for the energy crisis. In this study, wood was delignified, and the PEG-based eutectic polymer (PGMA) was impregnated into the delignified wood, and styrene (SM) grafted AlN was selected as thermal conductive filler to synthesize a stable phase change heat storage wood. The result shows that the styrene (SM) polymerized on the surface of AlN to form polystyrene (PS), and the dispersion of AlN was enhanced. The thermal stability and loss resistance of PCES-Wood are improved for the penetration of PS-AlN into the cavities, which is attributed to the PS-AlN playing a “limiting” role in the crystallization of PGMA. When the content of PS-AlN is 6%, the thermal conductivity of PCES-Wood reaches 0.5148 W/(m·K). 4% PS-AlN-PCES@Balsa has the lowest undercooling and heat loss rate, and the melting enthalpy and solidification enthalpy reach 125.60 J/g and 120.30 J/g, respectively. The phase change temperature range is between 19.59 and 33.87 °C, which is in the comfortable temperature range for humans. Under the illumination of the simulated solar light source, the surface temperature of PS-AlN-PCES@Balsa rises rapidly and shows a lasting heat storage capacity at low temperatures compared with the original wood. After 200 cold and hot cycle tests, the phase change enthalpy of PS-AlN-PCES@Balsa is still high, and there is a slight leakage phenomenon. The phase change wood prepared in this study shows that it is a potential material to store and release solar energy in practical applications.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Zhigang Xu,Kaiping He,Meijuan Li,Lei Xue,Qiang Shen,Chuanbin Wang
Aluminum nitride (AlN) ceramics with superior thermal conductivity and flexural strength are crucial for advanced thermal management applications. However, the simultaneous achievement of these properties continues to pose significant challenges. In this study, novel ErH 2 -Y 2 O 3 composite additives were introduced to fabricate AlN ceramics, resulting in a synergistic enhancement of thermal conductivity and flexural strength. The effects of varying ErH 2 content in the composite additives on the phase composition, densification, microstructure, thermal conductivity, and flexural strength of hot-press sintered AlN ceramics were systematically evaluated and compared with pure AlN. The results revealed that the inclusion of ErH 2 facilitated an in-situ reduction reaction with oxygen-containing impurities (e.g., Al 2 O 3 ), thereby generating Er 2 O 3 . Compared to using Y 2 O 3 alone, this ErH 2 -mediated reaction further reduced the lattice oxygen content in AlN. Moreover, ErH 2 significantly enhanced the homogeneity of the AlN grains and purified the grain boundary. Optimal addition of additives effectively reduced the lattice oxygen content and promoted the formation of isolated fine secondary phases. When the composite additives contained 2 wt% ErH 2 and 2 wt% Y 2 O 3 , the thermal conductivity and flexural strength of the AlN ceramics reached the peak value of 188.07 ± 7.37 W·m -1 ·K -1 and 378.22 ± 11.49 MPa, respectively. The enhancement of thermal conductivity by 22.65 % and flexural strength by 16.62 % relative to the sample with only Y 2 O 3 added.
研究领域:
材料科学
·
陶瓷与复合材料
·
热管理材料
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）