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Acta Metallurgica Sinica(English Letters) 2017年第7期30卷 675-687页

作者： Abdollah Saboori matteo pavese Claudio Badini Paolo Fino Department of Applied Science and Technology Politecnico di Torino Corso Duca degli Abruzzi 24 10129 Turin Italy

The objective of this research is to improve the thermal conductivity and mechanical properties of Al/GNPs（graphene nanoplatelets） nanocomposites produced by classical powder metallurgy and hot rolling techniques. The microstructural evaluation confirmed the uniform dispersion of GNPs at low content and agglomeration at higher contents of GNPs. The structure of graphene was studied before and after the mixing and the Raman spectrum proofs that the wet mixing has a great potential to be used as a dispersion method. There was no significant peak corresponding to the Al_4C_3 formation in both the differential scanning calorimetry curves and X-ray diffraction patterns. The microstructural observation in both fabrication techniques showed grain refinement as a function of the GNPs content. Moreover, the introduction of the GNPs not only improved the Vickers hardness of the composites but also decreased their density. The thermal conductivity investigations showed that in both the press-sintered and hot-rolled samples, although the thermal conductivity of composites was improved at low GNPs contents, it was negatively affected at high GNPs contents.

关键词： Aluminum Graphene Thermal conductivity Powder metallurgy Microstructure

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A Novel Cu–GNPs Nanocomposite with Improved Thermal and Mechanical Properties

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Acta Metallurgica Sinica(English Letters) 2018年第2期31卷 148-152页

作者： Abdollah Saboori matteo pavese Claudio Badini Paolo Fino Department of Applied Science and Technology Politecnico di Torino

Classical powder metallurgy followed by either hot isostatic pressing（HIPing） or repressing–annealing process was used to produce Cu–graphene nanoplatelets（GNPs） nanocomposites in this work. A wet mixing method was used to disperse the graphene within the matrix. The results show that a uniform dispersion of GNPs at low graphene contents could be achieved, whereas agglomeration of graphene was revealed at higher graphene contents. Density evaluations showed that the relative density of pure copper and copper composites increased by using the post-processing ***, it should be noticed that the efficiency of HIPing was remarkably higher than repressing–annealing process, and through the HIPing, fully dense samples were achieved. The Vickers hardness results showed that the reconsolidation steps can improve the mechanical strength of the specimens up to 50% owing to the progressive porosity elimination after reconsolidation. The thermal conductivity results of pure copper and composites at high temperatures showed that the postprocessing techniques could enhance the conductivity of materials significantly.

关键词： Copper Graphene nanoplatelets (GNPs) Powder metallurgy Hot isostatic pressing Thermal conductivity

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Development of AI-and Cu-based nanocomposites reinforced by graphene nanoplatelets： Fabrication and characterization

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Frontiers of Materials Science 2017年第2期11卷 171-181页

作者： Abdollah SABOORI matteo pavese Claudio BADINI Paolo FINO Department of Applied Science and Technology Politecnico Di Torino Corso Duca Degli Abruzzi 24 10129 Torino Italy

Aluminum and copper matrix nanocomposites reinforced by graphene nanoplatelets （GNPs） were successfully fabricated by a wet mixing method followed by conventional powder metallurgy. The uniform dispersion of GNPs within the metal matrices showed that the wet mixing method has a great potential to be used as a mixing technique. However, by increasing the GNPs content, GNPs agglomeration was more visible. DSC and XRD of AI/GNPs nanocomposites showed that no new phase formed below the melting point of AI. Microstructural observations in both nanocomposites reveal the evident grain refinement effect as a consequence of GNPs addition. The interfacial bonding evaluation shows a poor interfacial bonding between GNPs and AI, while the interfacial bonding between Cu and GNPs is strong enough to improve the properties of the Cu/GNPs nanocomposites. In both composites, the coefficient of thermal expansion decreases as a function of GNPs while, their hardness is improved by increasing the GNPs content as well as their elastic modulus.

关键词： nanocomposite aluminum copper graphene microstructure thermal expansion

Reactive spontaneous infiltration of Al-activated TiO_2 by molten aluminum

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Transactions of Nonferrous Metals Society of China 2019年第3期29卷 657-666页

作者： Abdollah SABOORI Xiang CHEN Claudio BADINI Paolo FINO matteo pavese Department of Applied Science and Technology Politecnico di TorinoCorso Duca Degli Abruzzi 24 10129 Torino Italy Research Center of Graphene Applications Beijing Institute of Aeronautical Materials Beijing 100095 China

The reactive spontaneous infiltration of Al-activated TiO2 (anatase) was investigated. Pure Al powder was blended with TiO2 for activation. They were compacted into the preform and then sealed within 6060 alloy mould. The activation and infiltration were carried out in 6060 alloy bath for 1 h and comparative sintering experiments were carried out in an argon protected environment under the same conditions of temperature and duration. X-ray diffraction analysis proved that the Al sealed environment was superior to the argon protection on activating the reaction between Al and TiO2. The blending ratio of TiO2 to Al and the temperature were found to play the most important role in infiltration by affecting infiltration and reaction kinetics. Three main types of microstructures were observed after infiltration: full infiltration, partial infiltration with the formation of cracks and no infiltration. The formation of these microstructures was explained on the basis of reaction kinetics and local volume changes due to the reactions. Ultimately, it is found that to obtain an overall good spontaneous infiltration, a TiO2 to Al blending ratio around 3:7 in volume and an infiltration temperature around 900 °C are the most suitable.

关键词： spontaneous infiltration pressureless sintering TiO2-Al reaction infiltration kinetics in-situ fabrication

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直接置于贮存杜瓦中精确测量4.2K低温的简易低温恒温器

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低温工程 1990年第5期 48-50,19页

作者： pavese,F 尚廷科

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艰难之活

与亨廷顿病严重程度相关的小胶质细胞激活:一项临床及PET研究

作者： (意)切萨雷・帕韦泽(Cesare pavese)

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世界核心医学期刊文摘(神经病学分册) 2006年第10期 61-62页

作者： pavese N. Gerhard A. P. Piccini 朱振中 Hammersmith Hospital Cyclotron Bldg. DuCane Road W12 0NN London United Kingdom Dr.

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影响帕金森病患者神经移植后临床预后的因素

世界核心医学期刊文摘(神经病学分册) 2006年第8期 35-35页

作者： Piccini P. pavese N. Hagell P. O. Lindvall 周永 Laboratory of Neurogenesis and Cell Therapy Lund Strategic Research Center for Stem Cell Biology and Cell Therapy University Hospital BMC A- 11 SE- 221 84 Lund Sweden Dr.

Intrastriatal grafts of embryonic mesencephalic tissue can survive in the brains of patients with Parkinson’s disease, but the degree of symptomatic relief is highly variable and some cases develop troublesome dyskinesias. Here we explored, using clinical assessment and 18F- dopa and 11C- raclopride PET, factors which may influence the functional outcome after transplantation. We observed increased 18F- dopa uptake in the grafted putamen, signifying continued survival of the transplanted dopaminergic neurons, in parallel with a progressive reduction of 18F- dopa uptake in non- grafted regions for the whole patient group. The patients with the best functional outcome after transplantation exhibited no dopaminergic denervation in areas outside the grafted areas either preoperatively or at 1 or 2 years post- operatively. In contrast, patients with no or modest clinical benefit showed reduction of 18F- dopa in ventral striatum prior to or following transplantation, which may have limited graft- induced improvement. We obtained no evidence that dyskinesias were caused by abnormal dopamine (DA) release from the grafts. As has been observed for intrinsic dopaminergic neurons, there was a significant correlation between 18F- dopa uptake and methamphetamine- induced change of 11C- raclopride binding (as a measure of DA release) in the putamen containing the graft. Furthermore, we observed no correlation between 11C- raclopride binding in anterior, posterior or entire putamen under basal conditions or after methamphetamine, and dyskinesia severity scores in the contralateral side of the body. Withdrawal of immunosuppression at 29 months after transplantation caused no reduction of 18F- dopa uptake or worsening of UPDRS motor score, indicating continued survival and function of the graft. However, patients showed increased dyskinesia scores, which might have been caused either by growth of the graft or worsening of a low- grade inflammation around the graft. These findings ind

关键词：帕金森病多巴胺能神经元雷氯必利患者