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学者姓名：郭福
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摘要 ：
Nano-Ag sintering can realize superior thermal, electrical, and mechanical properties for power electronic packaging, while it suffers from unstable microstructure and electrochemical migration. In this work, a super-saturated Ag2.8 wt%Cu nanoalloy film has been developed using pulsed laser deposition, which can be sintered at 250 degrees C in air for electronic packaging without sacrificing bondability. It was surprisingly found that both thermal stability and electrochemical migration resistance were significantly improved when alloying the Ag with 2.8 wt% Cu. The in situ formed Cu2O/CuO from Ag-Cu nanoalloy existed on the pore surface and along the grain boundaries of Ag/Ag-Cu nanoalloy, which stabilized the microstructure of bondline from 400 h to 1400 h at 300 degrees C. The synergistic effect of Ag-Cu nanoalloy and Cu oxides realized an obvious protective effect in the process of anodic dissolution, exhibiting a short-circuit time 2.4 times of the pure Ag electrode. The die attach process is compatible with most commercial equipment and Si/SiC dies with improved performance, enabling the supersaturated Ag-Cu nanoalloy to be a promising material for high reliability power electronic packaging.
关键词 ：
Power electronic packaging Power electronic packaging Thermal and electrochemical stability Thermal and electrochemical stability Low temperature sintering Low temperature sintering Ag-Cu nanoalloy Ag-Cu nanoalloy
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| GB/T 7714 | Jia, Qiang , Zou, Guisheng , Zhang, Hongqiang et al. Supersaturated Ag-Cu nanoalloy film for high reliability power electronic packaging [J]. | APPLIED SURFACE SCIENCE , 2023 , 612 . |
| MLA | Jia, Qiang et al. "Supersaturated Ag-Cu nanoalloy film for high reliability power electronic packaging" . | APPLIED SURFACE SCIENCE 612 (2023) . |
| APA | Jia, Qiang , Zou, Guisheng , Zhang, Hongqiang , Deng, Zhongyang , Wang, Wengan , Liu, Lei et al. Supersaturated Ag-Cu nanoalloy film for high reliability power electronic packaging . | APPLIED SURFACE SCIENCE , 2023 , 612 . |
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摘要 ：
In this research, camphorquinone (CQ)-mediated one-pot polyol methods to synthesize silver right bipyramids and nanorods with high yields are developed. The key strategy of these methods is the use of CQ which is first applied to selectively stabilize Ag(100) facets through capping. As CQ stabilizes small-sized nanocrystals, including single-twinned and nanorod struc-tures, we successfully synthesized silver right bipyramids and nanorods as the two dominant products in a CQ-mediated polyol system. Further morphology control between silver nanorods and silver right bipyramids is conducted through adjusting the poly(vinylpyrrolidone) (PVP) concentration and reaction temper-ature, which can improve the formation of single-twinned and fivefold twinned particles through affecting the reduction kinetics. Silver nanorods with a yield of 87% are obtained under 150 degrees C with a PVP/CQ/AgNO3 molar ratio of 1.2:2:1, while silver right bipyramids with a yield of 88% are obtained under 120 degrees C with a molar ratio of 1.6:2:1.
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| GB/T 7714 | Zhu, Zhaoxi , Wang, Xiaolu , Yu, Haiyang et al. Improved Polyol Syntheses of Silver Right Bipyramids and Nanorods: Camphorquinone-Mediated Morphology Control Methods [J]. | CRYSTAL GROWTH & DESIGN , 2023 , 23 (3) : 1455-1465 . |
| MLA | Zhu, Zhaoxi et al. "Improved Polyol Syntheses of Silver Right Bipyramids and Nanorods: Camphorquinone-Mediated Morphology Control Methods" . | CRYSTAL GROWTH & DESIGN 23 . 3 (2023) : 1455-1465 . |
| APA | Zhu, Zhaoxi , Wang, Xiaolu , Yu, Haiyang , Zhou, Wei , Wang, Yishu , Han, Jing et al. Improved Polyol Syntheses of Silver Right Bipyramids and Nanorods: Camphorquinone-Mediated Morphology Control Methods . | CRYSTAL GROWTH & DESIGN , 2023 , 23 (3) , 1455-1465 . |
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摘要 ：
This study investigates the structural, mechanical, and thermodynamic behaviors of AlSi2Sc2 under uniaxial tensile loading by performing first-principles calculations based on density functional theory. The parameters of the lattice a and c were found to depend on the Al-Si and the Sc-Si bonds, respectively. Tensile stress-strain curves were used to obtain ideal tensile strengths of 16.1 GPa and 21.2 GPa along the a-and c-axes, respectively. The criteria for stability showed that the AlSi2Sc2 compound became mechanically unstable when the strain exceeded 0.1 and 0.3 along the a- and the c-axes, respectively. The polycrystalline elastic constants of AlSi2Sc2 decreased with increasing strain along both axes as well, as did its Debye temperature and minimum thermal conductivity. An analysis of its electronic structure indicated that the Al-Si bonds mainly originated from the hybridization of the Al-3p and the Si-3p states, whereas the Sc-Si bonds originated from the Sc-3d and Si-3p states.
关键词 ：
Electronic structure Electronic structure Mechanical properties Mechanical properties Uniaxial tensile Uniaxial tensile Thermodynamic behavior Thermodynamic behavior First principles First principles
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| GB/T 7714 | Tan, Yong , Ma, Limin , Wang, Yishu et al. Mechanical and thermodynamic behaviors of AlSi2Sc2 under uniaxial tensile loading: A first-principles study [J]. | JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS , 2023 , 174 . |
| MLA | Tan, Yong et al. "Mechanical and thermodynamic behaviors of AlSi2Sc2 under uniaxial tensile loading: A first-principles study" . | JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS 174 (2023) . |
| APA | Tan, Yong , Ma, Limin , Wang, Yishu , Zhou, Wei , Wang, Xiaolu , Guo, Fu . Mechanical and thermodynamic behaviors of AlSi2Sc2 under uniaxial tensile loading: A first-principles study . | JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS , 2023 , 174 . |
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摘要 ：
The crystal structures, stability, mechanical behaviors, thermodynamic properties and electronic structures of Al2Si2La and Al2Si2Pr compounds have been investigated by means of first-principles calculations. It is revealed from formation enthalpies that Al2Si2La exhibit much more thermodynamically stability. According to the results of elastic constants, Al2Si2Pr has stronger incompressibility, stronger shape deformation resistance and higher stiffness. It can be concluded from Debye temperature and minimum thermal conductivity that Al2Si2Pr and Al2Si2La exhibit nearly the same thermal conductivity. Electronic structures results demonstrate that the Al-Si bonds in Al2Si2La and Al2Si2Pr are attributed to the hybridization of Al 3s state, Al 3p state and Si 3p state, while RE-Si bonds are the contribution of Si 3p state and La 5d or Pr 4f state in Al2Si2La and Al2Si2Pr, respectively.
关键词 ：
Electronic structure Electronic structure Debye temperature Debye temperature Thermodynamic Thermodynamic First-principles calculations First-principles calculations Formation enthalpy Formation enthalpy Mechanical property Mechanical property
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| GB/T 7714 | Tan, Yong , Guo, Fu . Insight into mechanical and thermodynamic properties of Al2Si2La and Al2Si2Pr from first-principles calculations [J]. | JOURNAL OF SOLID STATE CHEMISTRY , 2022 , 305 . |
| MLA | Tan, Yong et al. "Insight into mechanical and thermodynamic properties of Al2Si2La and Al2Si2Pr from first-principles calculations" . | JOURNAL OF SOLID STATE CHEMISTRY 305 (2022) . |
| APA | Tan, Yong , Guo, Fu . Insight into mechanical and thermodynamic properties of Al2Si2La and Al2Si2Pr from first-principles calculations . | JOURNAL OF SOLID STATE CHEMISTRY , 2022 , 305 . |
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摘要 ：
Harvesting waste heat into electricity through thermoelectric (TE) material can make a great contribution to reducing energy consumption and environment pollution. Cu2S has proved itself to be a highly promising TE material, whereas the poor electrical property restricts its practical application. Therefore, the way to improve its electrical property by doping elements with high carrier concentration in an environmental-friendly method accelerate its application. Herein, Ag nanoparticles are incorporated into a p-type Cu2S (Ag/Cu2S) by a facile hydrothermal method to improve the thermoelectric properties. The introduction of Ag can effectively tune the carrier concentration, resulting in a high power factor of 1698 mu W m(-1) K-2; meanwhile, Ag doping can also enhance the phonon scattering, further reducing the thermal conductivity. Eventually, a ZT(max) peak value approximate to 1.4 @ 773 K is achieved in the 0.5 wt% Ag-doped Cu2S samples. The design principle for Ag/Cu2S composites opens up a new pathway for the synthesis and application of thermoelectric material. (C) 2022 Elsevier B.V. All rights reserved.
关键词 ：
Thermoelectric material Thermoelectric material Hydrothermal method Hydrothermal method Ag nanoparticles Ag nanoparticles Cu2S Cu2S
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| GB/T 7714 | Yue, Ziwei , Zhou, Wei , Ji, Xiaoliang et al. Enhanced thermoelectric properties of Ag doped Cu2S by using hydrothermal method [J]. | JOURNAL OF ALLOYS AND COMPOUNDS , 2022 , 919 . |
| MLA | Yue, Ziwei et al. "Enhanced thermoelectric properties of Ag doped Cu2S by using hydrothermal method" . | JOURNAL OF ALLOYS AND COMPOUNDS 919 (2022) . |
| APA | Yue, Ziwei , Zhou, Wei , Ji, Xiaoliang , Zhang, Fuwen , Guo, Fu . Enhanced thermoelectric properties of Ag doped Cu2S by using hydrothermal method . | JOURNAL OF ALLOYS AND COMPOUNDS , 2022 , 919 . |
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摘要 ：
Among the state-of-the-art thermoelectric materials, copper sulfides (Cu2S) have been predicted as promising thermoelectric materials due to their low intrinsic thermal conductivity. However, they still confront the problems with lower electrical properties, which distinctly restrict their thermoelectric application. Significant enhancement of thermoelectric properties is a great challenge owing to the common interdependence of electrical and thermal conductivity. Herein, a micro/nano Cu2-xS composite, with significantly enhanced thermoelectric properties, is prepared via a simple hydrothermal method. Due to the synergistic effect of the introduced nanostructure and the increased Cu1.96S contents, the micro/nano Cu2-xS bulk samples present a power factor of 10.1 mu W cm-1 K-2 at 773 K. Meanwhile, a decrease of the thermal conductivity to 0.69 W m-1 K-1 is obtained, originating from the strong phonon scattering of micro/nano structure. Remarkably, a ZTmax value of 1.1 at 773 K is obtained, which is higher than the reported Cu2-xS thermoelectric material using chemical methods. This study proposes a facile microstructure engineering strategy for the development of high-performance thermoelectric materials.
关键词 ：
Hydrothermal method Hydrothermal method Thermoelectric properties Thermoelectric properties Cu (2-x) S Cu (2-x) S nano structure nano structure Micro Micro
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| GB/T 7714 | Yue, Ziwei , Zhou, Wei , Ji, Xiaoliang et al. Thermoelectric performance of hydrothermally synthesized micro/nano Cu2-xS [J]. | CHEMICAL ENGINEERING JOURNAL , 2022 , 449 . |
| MLA | Yue, Ziwei et al. "Thermoelectric performance of hydrothermally synthesized micro/nano Cu2-xS" . | CHEMICAL ENGINEERING JOURNAL 449 (2022) . |
| APA | Yue, Ziwei , Zhou, Wei , Ji, Xiaoliang , Wang, Yishu , Guo, Fu . Thermoelectric performance of hydrothermally synthesized micro/nano Cu2-xS . | CHEMICAL ENGINEERING JOURNAL , 2022 , 449 . |
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摘要 ：
Crystalline and amorphous cobalt-phosphorus (Co-P) coatings have their own advantages in interfacial dif-fusion resistance and mechanical ductility of solder joints, respectively, but it cannot be better at both. In this work, the hybrid crystalline-amorphous Co-P coating (Co-9.1 at.% P) was fabricated and applied on the Cu/Sn interface by controlling the crystallinity through compositional design. Combining the advan-tages of crystalline and amorphous Co-P, strategies for solder joints with high shear strength, ductile inter -metallic compounds (IMCs) and slow interface consumption was proposed. The evolution, microstructure, phase, and mechanical properties of the Co-Sn, Co-Sn-P and P-rich layers in solid-state diffusion were sys-tematically characterized and tested by means of SEM, EPMA, EBSD, TEM, nanoindentation, and shear test. It was found that the hybrid Co-P coating achieved a low consumption rate, 14.2 nm/h, attributing to the par-tially crystalline structure and the Co-Sn-P exfoliation behavior. In addition, solder joints containing large -thickness ductile Co-Sn IMCs, 3.2-3.6 GPa of hardness, was established. The shear strength after aging reached 75.4 MPa relying on the large thickness of Co-Sn IMCs. Severe mechanical loads would be able to be withstand by virtue of the plastic deformation of ductile IMCs. Hybrid crystalline-amorphous Co-P would be a promising interface material in microelectronic packaging.(c) 2022 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
关键词 ：
Intermetallic compound Intermetallic compound Hybrid coating Hybrid coating Ductility Ductility Exfoliation Exfoliation Diffusion resistance Diffusion resistance Cobalt-phosphorus Cobalt-phosphorus
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| GB/T 7714 | Liu, Shuang , Ma, Limin , Zhen, Cheng et al. Strategies for solder joints with high shear strength, slow interfacial consumption, ductile intermetallic compounds using hybrid crystalline- amorphous Co-P coatings [J]. | MATERIALS & DESIGN , 2022 , 224 . |
| MLA | Liu, Shuang et al. "Strategies for solder joints with high shear strength, slow interfacial consumption, ductile intermetallic compounds using hybrid crystalline- amorphous Co-P coatings" . | MATERIALS & DESIGN 224 (2022) . |
| APA | Liu, Shuang , Ma, Limin , Zhen, Cheng , Wang, Yishu , Li, Dan , Guo, Fu . Strategies for solder joints with high shear strength, slow interfacial consumption, ductile intermetallic compounds using hybrid crystalline- amorphous Co-P coatings . | MATERIALS & DESIGN , 2022 , 224 . |
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摘要 ：
废线路板非金属材料回收利用技术现状与展望
关键词 ：
非金属材料 非金属材料 废线路板 废线路板 回收 回收
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| GB/T 7714 | 郝娟娟 , 王乙舒 , 吴玉峰 et al. 废线路板非金属材料回收利用技术现状与展望 [J]. | 郝娟娟 , 2021 , 35 (7) : 7001-7012 . |
| MLA | 郝娟娟 et al. "废线路板非金属材料回收利用技术现状与展望" . | 郝娟娟 35 . 7 (2021) : 7001-7012 . |
| APA | 郝娟娟 , 王乙舒 , 吴玉峰 , 郭福 , 材料导报 . 废线路板非金属材料回收利用技术现状与展望 . | 郝娟娟 , 2021 , 35 (7) , 7001-7012 . |
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摘要 ：
近年来,随着科学技术的快速发展和生活水平的不断提高,人们对电子电气设备的需求量不断增加。随着生活质量的提高,人们逐渐追求电子电气设备多功能化、轻便化,造成电子电气设备寿命不断缩短,更新换代速度加快。世界范围内废电子电气设备数量以惊人的速度增长,其成分复杂,含有多种金属元素以及有毒有害物质,对资源回收以及环境保护既是机遇也是挑战。废线路板作为废电子电气设备的主要部件,含有多种金属元素,且含量高于相应矿产,具有很高的回收价值。由于金属材料具有高的经济价值,其回收引起世界广泛关注,很多研究致力于探索高效、环保的金属材料回收方法,目前关于金属材料的回收技术已经十分成熟。然而,由于回收经济效益低,在线路...
关键词 ：
非金属材料 非金属材料 回收 回收 废线路板 废线路板
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| GB/T 7714 | 郝娟娟 , 王乙舒 , 吴玉峰 et al. 废线路板非金属材料回收利用技术现状与展望 [J]. | 材料导报 , 2021 , 35 (07) : 7001-7012 . |
| MLA | 郝娟娟 et al. "废线路板非金属材料回收利用技术现状与展望" . | 材料导报 35 . 07 (2021) : 7001-7012 . |
| APA | 郝娟娟 , 王乙舒 , 吴玉峰 , 郭福 . 废线路板非金属材料回收利用技术现状与展望 . | 材料导报 , 2021 , 35 (07) , 7001-7012 . |
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摘要 ：
To increase the strength and wear resistance of material surfaces, various combinations of B4C and 80TiFe powder were mixed into a Fe60 self-fluxing alloy powder; the composite coatings reinforced by TiB2-TiC were successfully prepared on Q235 steel surfaces by laser cladding. Scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), and X-ray diffraction (XRD) were used to study the microstructure and chemical and phase composition. Microhardness and wear testers were used to investigate the mechanical properties. The results show that the interfaces of composite coatings and substrate materials are excellent for metallurgical bonding. The block-like TiB2 particles and flower-like TiC particles are uniformly distributed in the cladding coating. When the mass fraction of the mixed powder is 30%, the average microhardness of the coating is approximately 1100 HV0.2, which is 50% higher than that without the mixed powder, and demonstrates the best wear with a performance twice as better as that of the substrate. © 2021 World Scientific Publishing Company.
关键词 ：
Energy dispersive spectroscopy Energy dispersive spectroscopy Wear resistance Wear resistance Scanning electron microscopy Scanning electron microscopy Laser cladding Laser cladding Composite coatings Composite coatings Chemical bonds Chemical bonds Powder coatings Powder coatings Microhardness Microhardness Titanium carbide Titanium carbide Microstructure Microstructure Boron carbide Boron carbide Wear of materials Wear of materials
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| GB/T 7714 | Yang, Tianwei , Wang, Zhaohui , Tan, Shihai et al. Microstructure and wear resistance of in-situ synthesized tib2-Tic/fe composite coating by laser cladding [J]. | Surface Review and Letters , 2021 , 28 (2) . |
| MLA | Yang, Tianwei et al. "Microstructure and wear resistance of in-situ synthesized tib2-Tic/fe composite coating by laser cladding" . | Surface Review and Letters 28 . 2 (2021) . |
| APA | Yang, Tianwei , Wang, Zhaohui , Tan, Shihai , Guo, F.U. . Microstructure and wear resistance of in-situ synthesized tib2-Tic/fe composite coating by laser cladding . | Surface Review and Letters , 2021 , 28 (2) . |
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