|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Achieving strength-ductility synergy in cold spray additively manufactured Al/B4C composites through a hybrid post-deposition treatment显示文摘Cold spray additive manufacturing(CSAM) provides a potential solid state manufacturing route to fabricate variety of aluminum matrix composites(AMCs) with reduced possibility of undesired chemical reactions and residual thermal stresses. This study presents a hybrid(i.e. hot compression + hot rolling)post-deposition treatment to reinvigorate the mechanical properties of cold spray additively manufactured Al/B4 C composites. The as-deposited samples were initially subjected to 30% thickness reduction via hot compression treatment at 500°C followed by a hot rolling treatment with 40% thickness reduction in 2 passes. Electron backscatter diffraction(EBSD) and high resolution transmission electron microscopy(HRTEM) results revealed that after hybrid post-deposition treatment(involving 70%accumulative thickness reduction), the aluminum grains in the matrix were extensively refined due to simultaneous operation of continuous dynamic recrystallization(CDRX) and geometric dynamic recrystallization(GDRX). Furthermore, interfacial defects were remarkably reduced while the nature of Al/Al and Al/B4C interfacial bonding was changed from sheer mechanical interlocking to metallurgical bonding which facilitated efficient transference of applied load to uniformly dispersed bimodal B4C particles. As a result, ultimate tensile strength(UTS) and elongation(EL) of the as-deposited sample were simultaneously improved from 37 to 185 MPa and 0.3% to 6.2%, respectively. | Naeem ul Haq Tariq Lawrence Gyansah Xiang Qiu Chunnijia Hasan Bin Awais Chengwu Zheng Hao Du Jiqiang Wang Tianying Xiong | 2019 | Journal of Materials Science & Technology2019，35，6： | 7 |
| 2 | A novel approach for fabricating a CNT/AlSi composite with the self-aligned nacre-like architecture by cold spraying显示文摘A fully dense carbon nanotubes (CNTs) reinforced AlSi matrix composite with the multiscale nacre-like architecture was designed and successfully realized by flake powder metallurgy followed by cold spraying (CS). The nanolaminated and ultrafine-grained structure initially created in the CNT/AlSi flaky powder was perfectly conserved, due to the typical ‘cold’ feature of CS. As discussed based on finite element analysis and single splat observation, self-alignment behavior of the flaky powders during impact also allowed the formation of the microlaminated structure. Hence, the scalable CS technique opens a new avenue for bioinspired material design and fabrication with complex shape. | Xinliang Xie Chaoyue Chen Gang Ji Run Xu Zhanqiu Tan Yingchun Xie Zhiqiang Li Hanlin Liao | 2019 | Nano Materials Science2019，1，2： | 3 |
| 3 | Preparation and performance of a cold gas dynamic sprayed high-aluminum bronze coating显示文摘By mixing preheated high-aluminum bronze powders with different amounts of Al_2O_3 powder, a low-pressure cold-sprayed coating was prepared and sprayed onto a Cr12MoV steel substrate. The hardness of the coating and the bonding strength between the coating and the substrate were tested with a HV-1000 microhardness tester and a mechanical universal testing machine. The surface microstructure, cross-section and tensile fracture surface of the coating were observed with a scanning electron microscope(SEM). Correspondingly, the influences of the preheat treatment temperature of the bronze powder and the Al_2O_3 content on the coating performance were investigated. The results indicate that the hardness of bronze powders decreased and the coating deposition rate increased after the preheating treatment of the bronze powder. The Al_2O_3 content in the mixed powders contributed to the deformation of bronze powders during the spraying process. This trend resulted in varied performance of the coating. | Li Feng Chang Guan Ji-rong Chang Hai-min Zhai Guo-sheng An Wen-sheng Li | 2018 | International Journal of Minerals,Metallurgy and Materials2018，25，11： | 2 |
| 4 | Strategy to Improve the Performance of Dye-sensitized Solar Cells Based on TiO_2 Films Prepared by Room Temperature Cold Spray显示文摘Dye-sensitized solar cells(DSCs)are promising photochemical solar cells owing to their high efficiency and low cost.In this study,the influence of cell geometry,electrolyte composition,and counter electrode(CE)characteristics on the performance of DSCs was investigated to aim at improving the cell efficiency.Using an U-type cell geometry proposed decreased the internal resistance of DSCs and therefore increased the fill factor and energy conversion efficiency.The addition of DMPII to the I-/I3-based electrolyte increased the open-circuit voltage by decreasing the dark current.Compared to the DSCs with the Pt CE prepared by the thermal decomposition of H2PtCl6,the DSCs with the sputtered Pt CE showed a higher fill factor and short-circuit current density,owing to the high electrical conductivity and enhanced light-reflecting ability of the mirror-like sputtered Pt CE.Based on these results,the energy conversion efficiency of the DSC with the TiO2 porous films fabricated by a room temperature cold spray method was increased from 3.93%to 5.11%.The relatively high efficiency shows that the room temperature cold spray is a prospective method in fabricating nanocrystalline TiO2 films for flexible DSCs. | He Xuelong1,Yang Guanjun1,Yao Hailong1,Li Changjiu1,Li Shan1,Liu Mei1,Fan Shengqiang2 1 State Key Laboratory for Mechanical Behavior of Materials,Xi’an Jiaotong University,Xi’an,Shaanxi 710049,China 2 The University of Queensland,QLD 4072,Australia | 2012 | 稀有金属材料与工程2012，41，S1： | 1 |
| 5 | Preliminary Study on Cavity Characteristics of Cold Sprayed Thickness Coating显示文摘In this article,the absence of self-replenishing of cold spray is studied by examining the thick coating deposited around the pre-drilled microsize hole.Thick copper coating was deposited around the microsize holes(about 200 and 500μm) using cold spraying methods on copper substrate,the cross-section of cavity around the hole were observed with SEM to investigate the characteristics of cavity.Computational methods were also used to investigate the original formation reason of the cavity.The results indicate:the original formation reason of cavity is that particles are too closed when impact onto the substrate.The repellant force between the particles perpendicular to the impaction direction will lead to porosity if the particles are too close.Much lower flatten ratio occurred for succeeding particle if the particles are too close at the same point because the momentum energy convert to the former particle's deformation.A high probability of above two phenomenon resulting from high powder feeding rate will form the original cavity.In relative wider cavity,coating can be deposited in the bottom,while in the relative narrow cavity,coating can not be deposited.The thickness of the coating in the cavity is much thinner than coating around the cavity.The cavity grow larger and larger on pre-drilled holes just as the regime effect of cold spray of fixed location deposition. | Huang Guosheng Li Xiangbo Gu Deming Xing Lukuo | 2012 | 稀有金属材料与工程2012，41，S1： | 0 |
| 6 | Microstructuring of titanium surfaces with plasma-modified titanium particles by cold spraying显示文摘Although the deposition mechanisms of the cold spray process are well studied, few reports regarding the use of surface-modified particles exist. Herein, titanium particles 3-39 μm in size and with an angular shape were modified in a plasma-enhanced chemical vapor deposition process in Ar, Ar-C2H2, and N2 plasmas. After Ar-C2H2 and N2 treatments, the respective presence of TiC and TiN on the particle surface was confirmed via transmission electron microscopy and energy-dispersive X-ray, X-ray photoelectron, and Raman spectroscopies. The powders were deposited on titanium substrates by cold spray experiments, where unmodified particles up to 10(xm in size exhibited a successful surface bon ding. This finding was described by an existing analytical model, whose parameters were achieved by computational fluid dynamics simulations taking the particle shape factor into account:. A good deposition of plasma-modified particles up to 30 μm in size was experimentally observed, exhibiting an upper size limit larger than that predicted by the model. Higher surface roughness values were found for plasmamodified particles, as determined by 3D scanning electron microscopy. The water contact angle indicated that argon treatment influenced the wettability. Tribological tests showed a decrease of the initial friction coefficient from 0.53 to 0.47 by microstructuring. | P. Breuninger F. Krull S. Buhl A. Binder R. Merz M. Kopnarski B. Sachweh S. Antonyuk | 2019 | Particuology2019，17，3： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员