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碳纳米管对水泥基材料热膨胀性能的影响
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作者 张淑文 张杰 +1 位作者 王贵春 高丹盈 《材料研究学报》 EI CAS CSCD 北大核心 2019年第5期387-393,共7页
在水泥基中掺入不同比例的碳纳米管,制备出碳纳米管水泥基复合材料。测量其在室温~600℃的热膨胀性能,并根据DSC/TG、XRD图谱,孔径分布图和扫描电镜图从微观尺度分析其变化规律的机理。结果表明,从室温到150℃掺入各比例碳纳米管的水泥... 在水泥基中掺入不同比例的碳纳米管,制备出碳纳米管水泥基复合材料。测量其在室温~600℃的热膨胀性能,并根据DSC/TG、XRD图谱,孔径分布图和扫描电镜图从微观尺度分析其变化规律的机理。结果表明,从室温到150℃掺入各比例碳纳米管的水泥基复合材料热膨胀率变化趋势相似,热膨胀率为正值而出现微膨胀;150℃~590℃热膨胀率为负值且逐渐减小,试件持续收缩。当碳纳米管的掺量为水泥的0.3%时热膨胀曲线始终在其他掺量之下,热膨胀率达到最小值。这表明,碳纳米管掺量为0.3%的材料水化反应充分,产生大量的水化硅酸钙凝胶,收缩明显、密实度显著提高。掺入0.3%的碳纳米管可有效阻止供暖管道局部混凝土的膨胀,提高结构的耐久性。 展开更多
关键词 复合材料 碳纳米管 碳纳米管水泥基复合材料 微观结构 高温作用 热膨胀率
Yolk-shell Si/C composites with multiple Si nanoparticles encapsulated into double carbon shells as lithium-ion battery anodes 预览
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作者 Le Hu Bin Luo +3 位作者 Chenghao Wu Pengfei Hu Lianzhou Wang Haijiao Zhang 《能源化学:英文版》 SCIE EI CAS CSCD 2019年第5期124-130,共7页
The conceptual design of yolk-shell structured Si/C composites is considered to be an effective way to improve the recyclability and conductivity of Si-based anode materials. Herein, a new type of yolk-shell structure... The conceptual design of yolk-shell structured Si/C composites is considered to be an effective way to improve the recyclability and conductivity of Si-based anode materials. Herein, a new type of yolk-shell structured Si/C composite (denoted as TSC-PDA-B) has been intelligently designed by rational engineering and precise control. In the novel structure, the multiple Si nanoparticles with small size are successfully encapsulated into the porous carbon shells with double layers benefiting from the strong etching effect of HF. The TSC-PDA-B product prepared is evaluated as anode materials for lithium-ion batteries (LIBs). The TSC-PDA-B product exhibits an excellent lithium storage performance with a high initial capacity of 2108 mAh g^-1 at a current density of 100 mA g^-1 and superior cycling performance of 1113 mAh g^-1 over 200 cycles. The enhancement of lithium storage performance may be attributed to the construction of hybrid structure including small Si nanoparticles, high surface area, and double carbon shells, which can not only increase electrical conductiv让y and intimate electrical contact with Si nanoparticles, but also provide built-in buffer voids for Si nanoparticles to expand freely without damaging the carbon layer. The present findings can provide some scientific insights into the design and the application of advanced Si-based anode materials in energy storage fields. 展开更多
关键词 Si/C COMPOSITES Yolk-shell Multiple SI nanoparticles Double CARBON SHELLS Energy storage
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Microstructure evolution and interface structure of Al-40 wt% Si composites produced by high-energy ball milling
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作者 Yuanyuan Chen Zhangping Hu +5 位作者 Yifei Xu Jiangyong Wang Peter Schützendübe Yuan Huang Yongchang Liu Zumin Wang 《材料科学技术学报:英文版》 SCIE EI CAS CSCD 2019年第4期512-519,共8页
High silicon content Al-Si composites with a composition of Al-40 wt% Si were fabricated via a highenergy ball milling method. The microstructure evolution of Al-40 wt% Si milled powders and sintered composites has be... High silicon content Al-Si composites with a composition of Al-40 wt% Si were fabricated via a highenergy ball milling method. The microstructure evolution of Al-40 wt% Si milled powders and sintered composites has been thoroughly studied by scanning electron microscopy, X-ray diffraction, energydispersive spectrometry and high-resolution transmission electron microscopy. The mechanism of ball milling Al-40 wt% Si powders has been disclosed in detail: fracture mechanism dominating in the early stages, followed by the agglomeration mechanism, finally reaching the balance between the fragments and the agglomerates. It has been found that the average particle sizes of mixed Al-Si powders can be refined to the nanoscale, and the crystallite sizes of Al and Si have been reduced to 10nm and 62nm upon milling for 2h–50h, respectively. The finally formed Al-Si interfaces after ball milling for 50h are wellcohesive. A dense and homogenous Al-40 wt% Si composite have been achieved by solid-state sintering at550?C. The results thus provide an effective support for producing bulk nanostructured Al-Si composites. 展开更多
关键词 AL-SI COMPOSITES Interface structure HIGH-ENERGY ball MILLING NANOCRYSTALLINE powders
General aspects on structural integrity
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作者 J.J.XIONG R.A.SHENOI 《中国航空学报:英文版》 SCIE EI CAS CSCD 2019年第1期114-132,共19页
This paper seeks to mark the fruitful collaborative research between scholars in the University of Southampton and Beihang University for last 25 years on structural integrity. Their efforts addressed some important i... This paper seeks to mark the fruitful collaborative research between scholars in the University of Southampton and Beihang University for last 25 years on structural integrity. Their efforts addressed some important issues in structural integrity such as fatigue and fracture behavior,fatigue load spectra, fatigue and fracture lifetimes, reliability-based service period, adhesively bonded composite patch repairs, Plain Woven Fabric(PWF) composites and composite artefacts.New advances in engineering approaches, experimental methods, numerical algorithms and understanding of failure mechanisms relating to structural integrity are highlighted. Probable limits(or drawbacks) are also discussed. This review provides an insight into the general aspects on structural integrity and constitutes a basis for pointers to the further works on structural integrity. 展开更多
关键词 COMPOSITES FATIGUE FRACTURE Reliability REPAIR Structural INTEGRITY
C/Al2O3复合材料的固体粒子冲蚀行为与磨擦磨损性能
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作者 范朝阳 马青松 曾宽宏 《稀有金属材料与工程》 SCIE EI CAS CSCD 北大核心 2019年第7期2323-2329,共7页
以溶胶浸渍热处理技术路线制备的碳纤维布叠层缝合预制件增强Al2O3(C/Al2O3)复合材料为对象,以刚玉粉为介质,研究了复合材料的固体粒子冲蚀行为,按照GB5763-2008规定的条件研究了复合材料的磨擦磨损性能。室温下,复合材料冲蚀率随着冲... 以溶胶浸渍热处理技术路线制备的碳纤维布叠层缝合预制件增强Al2O3(C/Al2O3)复合材料为对象,以刚玉粉为介质,研究了复合材料的固体粒子冲蚀行为,按照GB5763-2008规定的条件研究了复合材料的磨擦磨损性能。室温下,复合材料冲蚀率随着冲击角度与送粉量的增大而增加;温度升高,由于机械冲击和热冲击的双重作用,冲蚀率显著变大。在GB5763-2008规定的条件下,C/Al2O3复合材料具有稳定的摩擦系数和很低的磨损率。结合微观形貌分析,探讨了复合材料的冲蚀与磨损机理。得益于连续碳纤维的补强增韧作用,即使基体致密度低于单体Al2O3陶瓷,C/Al2O3复合材料在冲蚀和磨损时不会发生脆性断裂,使用安全性优于单体Al2O3陶瓷。 展开更多
关键词 氧化铝 复合材料 冲蚀 磨擦 磨损
Evaluation of numerical ablation model for charring composites
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作者 Ll Wei ZHANG Jun +3 位作者 FANG GuoDong LI WeiJie LIANG Jun MENG SongHe 《中国科学:技术科学英文版》 SCIE EI CAS CSCD 2019年第8期1322-1330,共9页
Charring composites are widely used in the thermal protection system(TPS) to consume the intense aerodynamic heating during vehicle reentry. The ablation and thermal responses for the charring composites can be studie... Charring composites are widely used in the thermal protection system(TPS) to consume the intense aerodynamic heating during vehicle reentry. The ablation and thermal responses for the charring composites can be studied by using a numerical ablation model, in which the surface ablation and volume ablation could be taken into account. The coupling interactions among temperature, gas motion and interior pressure producing the pyrolysis gas could make the computation more complicated. A multi-physics model is developed to simulate the thermal response coupled with volume ablation and surface ablation. After studying four typical ablation cases, the model is validated, and then the heat transfer mechanisms in ablation are investigated. It is found that the viscous dissipation energy by the motion of pyrolysis gas can be neglected in the simulation. Also, the flow of pyrolysis gas plays an important role in the temperature response, especially under high heat flux condition. 展开更多
关键词 ablation CHARRING COMPOSITES NUMERICAL MODEL COUPLING
聚氨酯基体配比对芳纶增强聚氨酯复合材料力学性能的影响 预览
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作者 程仁政 李小慧 +2 位作者 沈景凤 金石磊 林彬 《理化检验:物理分册》 CAS 2019年第1期19-22,共4页
以甲、乙双组分聚氨酯为基体,芳纶为增强体,制备了不同基体配比的芳纶增强聚氨酯复合材料,并采用拉伸试验、弯曲试验、冲击试验等方法对其力学性能进行了分析。结果表明:随着聚氨酯中乙组份比例的增大,芳纶增强聚氨酯复合材料的拉伸断... 以甲、乙双组分聚氨酯为基体,芳纶为增强体,制备了不同基体配比的芳纶增强聚氨酯复合材料,并采用拉伸试验、弯曲试验、冲击试验等方法对其力学性能进行了分析。结果表明:随着聚氨酯中乙组份比例的增大,芳纶增强聚氨酯复合材料的拉伸断裂强度、拉伸弹性模量、弯曲强度和弯曲弹性模量也随之增大,断裂伸长率则随之减小,冲击韧度先增大后减小,当甲、乙组比例为10∶4时,冲击韧度最大。 展开更多
关键词 芳纶 聚氨酯 复合材料 基体配比 力学性能
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银-石墨烯复合材料的滑动摩擦磨损性能 预览
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作者 王松 谢明 +5 位作者 陈永泰 刘满门 陈松 王塞北 胡洁琼 李爱坤 《贵金属》 CAS CSCD 北大核心 2019年第1期63-69,共7页
采用球磨混粉、冷等静压和真空烧结的工艺流程制备了含0.5%~2.0%石墨烯的银-石墨烯复合材料,并对复合材料进行销盘式摩擦磨损试验以研究其大气环境滑动摩擦磨损性能。研究结果表明,因石墨烯易团聚,石墨烯含量限于1.5%时能够有效改善复... 采用球磨混粉、冷等静压和真空烧结的工艺流程制备了含0.5%~2.0%石墨烯的银-石墨烯复合材料,并对复合材料进行销盘式摩擦磨损试验以研究其大气环境滑动摩擦磨损性能。研究结果表明,因石墨烯易团聚,石墨烯含量限于1.5%时能够有效改善复合材料的性能。与未增强的银相比,由于在接触表面形成自润滑碳质膜,银-石墨烯复合材料表现出较低的摩擦系数、较少的磨损量和较低的接触表面温度。随石墨烯含量的增加,复合材料的摩擦系数和磨损量均下降。复合材料的主要磨损机制为粘着磨损和磨料磨损。 展开更多
关键词 复合材料 银-石墨烯 摩擦系数 磨损量
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环氧树脂改性聚乳酸/低熔点尼龙6复合材料的结构和性能
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作者 李明专 胡孝迎 +2 位作者 何敏 于杰 鲁圣军 《材料研究学报》 EI CAS CSCD 北大核心 2019年第4期261-270,共10页
用'熔融挤出-热拉伸-淬冷'法制备环氧树脂改性聚乳酸(ePLA)/低熔点尼龙6(LMPA6)复合材料,使用差示扫描量热法(DSC)、X射线衍射(XRD)、热重分析(TGA)、流变仪和电子拉伸机等手段研究了具有不同LMPA6含量的ePLA/LMPA6复合材料的... 用'熔融挤出-热拉伸-淬冷'法制备环氧树脂改性聚乳酸(ePLA)/低熔点尼龙6(LMPA6)复合材料,使用差示扫描量热法(DSC)、X射线衍射(XRD)、热重分析(TGA)、流变仪和电子拉伸机等手段研究了具有不同LMPA6含量的ePLA/LMPA6复合材料的结晶行为、热性能、流变性能以及力学性能。DSC结果表明,LMPA6的加入改变了PLA的晶体结构,显著改变了复合材料体系的冷结晶温度、冷结晶熔融温度。热重分析(TGA)结果表明,LMPA6的加入提高了ePLA/LMPA6复合材料的热稳定性。动态力学性能结果表明,LMPA6的加入提高了ePLA/LMPA6复合材料的玻璃化转变温度(T_g)。流变学测试结果表明,应变(γ)超过临界应变(γC)后储能模量(G’)呈非线性下降,出现'Payne'效应。这种复合材料表现出非牛顿流体的特性—'剪切变稀'行为,而且随着LMPA6含量的提高体系的'剪切变稀'行为更加明显。根据扫描电镜照片,在LMPA6含量为7%的体系中出现微纤结构,使其相容性最好。LMPA6的加入在一定程度上提高了复合材料的强度和韧性,特别是LMPA6含量为7%的复合材料其拉伸强度(72.8MPa)和冲击强度(5.0 kJ/m2)达到极值,比改性聚乳酸(65.7 MPa,2.8 kJ/m~2)分别提高了10.8%和78.6%。 展开更多
关键词 复合材料 聚乳酸 环氧树脂 低熔点尼龙6 流变行为 增韧
Enhanced Wear Resistance of Ni/h-BN Composites with Graphene Addition Produced by Spark Plasma Sintering
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作者 Jiao Xu Dan-Qing Yi +1 位作者 Qiang Cui Bin Wang 《金属学报:英文版》 SCIE EI CAS CSCD 2019年第7期876-886,共11页
Ni-based self-lubricating composites containing a fixed amount of hexagonal boron nitride (h-BN)(5 wt%) and different amounts of graphene (0-1.5 wt%) were prepared by ultrasonic dispersion, high-energy ball milling, a... Ni-based self-lubricating composites containing a fixed amount of hexagonal boron nitride (h-BN)(5 wt%) and different amounts of graphene (0-1.5 wt%) were prepared by ultrasonic dispersion, high-energy ball milling, and spark plasma sintering. The effects of the graphene content on the physical, mechanical, and wear properties of the Ni/h-BN composites were evaluated. These properties were first enhanced with increasing graphene content, reaching optimal behavior for a graphene content of 1 wt%, and then degraded with further graphene addition. Compared to the pure Ni/h-BN composite, the relative density, hardness, and bending strength of the composite with 1 wt% graphene increased by 2.7%, 7.4%, and 6.3%, respectively, while the friction coefficient decreased by 56% to 0.31, and a reduction in wear rate by a factor of 5-15 was observed. The mechanism for improving the wear properties of the composite with added graphene was due to the formation of a graphene lubricating film on the worn surface, which increased the load bearing capacity of the surface and enhanced lubrication during wear. 展开更多
关键词 GRAPHENE H-BN Wear NI matrix COMPOSITES
石墨烯/环氧树脂多功能复合材料研究进展 预览
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作者 白刚 肖伟 +2 位作者 高锋 张剑 罗文波 《宇航材料工艺》 CAS CSCD 北大核心 2019年第1期1-8,共8页
主要介绍石墨烯改性环氧树脂复合材料力学、热学、电学性能的研究进展,以及石墨烯在碳纤维/环氧树脂功能型复合材料中的应用,并展望结构-功能一体化石墨烯改性复合材料在航天领域的应用前景。
关键词 石墨烯 环氧树脂 复合材料
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热塑性复合材料原位成型工艺及关键技术 预览
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作者 秦滢杰 韩建平 陈书华 《宇航材料工艺》 CAS CSCD 北大核心 2019年第1期9-14,共6页
介绍了原位成型工艺及其两项关键技术的研究与发展过程,根据原位成型技术应用于航天领域的典型型号,提出了原位成型工艺两项关键技术的指标,并对原位成型工艺未来的发展进行了展望。
关键词 热塑性 复合材料 原位成型 预浸料 铺放头
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功能化石墨烯/聚甲基丙烯酸甲酯复合材料的制备及介电性能研究 预览
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作者 李亚男 邢瑞光 张邦文 《内蒙古科技大学学报》 CAS 2019年第2期126-130,共5页
利用原位聚合的方法制备了不同添加量1,3-二羰基功能化还原氧化石墨烯(rDGO)和聚甲基丙烯酸甲酯(PMMA)的复合材料(rDGO/PMMA).通过傅里叶变换红外光谱和场发射扫描电镜等对功能化石墨烯rDGO与rDGO/PMMA复合材料的官能团和微观结构进行... 利用原位聚合的方法制备了不同添加量1,3-二羰基功能化还原氧化石墨烯(rDGO)和聚甲基丙烯酸甲酯(PMMA)的复合材料(rDGO/PMMA).通过傅里叶变换红外光谱和场发射扫描电镜等对功能化石墨烯rDGO与rDGO/PMMA复合材料的官能团和微观结构进行了表征.并对它的亲水性和介电性能进行了测试,rDGO/PMMA复合薄膜比纯的PMMA膜在亲水性和介电性能上均有提高.结果表明:rDGO/PMMA复合材料有望在未来介电存储设备上得到应用. 展开更多
关键词 石墨烯 功能化 聚甲基丙烯酸甲酯 复合材料 介电性能
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Achieving strength-ductility synergy in cold spray additively manufactured Al/B4C composites through a hybrid post-deposition treatment
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作者 Naeem ul Haq Tariq Lawrence Gyansah +6 位作者 Xiang Qiu Chunnijia Hasan Bin Awais Chengwu Zheng Hao Du Jiqiang Wang Tianying Xiong 《材料科学技术学报:英文版》 SCIE EI CAS CSCD 2019年第6期1053-1063,共11页
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 residu... 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. 展开更多
关键词 Cold spray additive manufacturing Post-deposition treatments Al/B4C COMPOSITES Dynamic recrystallization Mechanical properties
Strength and Wear Behavior of Mg Alloy AE42 Reinforced with Carbon Short Fibers
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作者 Sabbah Ataya Naser A.Alsaleh Mohamed M.El-Sayed Seleman 《金属学报:英文版》 SCIE EI CAS CSCD 2019年第1期31-40,共10页
In addition to the advantage of the lightweight of magnesium alloys, magnesium composites have moderate strength and elastic modulus. The proposed application of magnesium composites as diesel truck pistons makes it n... In addition to the advantage of the lightweight of magnesium alloys, magnesium composites have moderate strength and elastic modulus. The proposed application of magnesium composites as diesel truck pistons makes it necessary to assess their wear performance. Little research data have been discussed on wear behavior of Mg alloy AE42 matrix and its composites. Thus, this paper reports wear behavior of magnesium alloy AE42(Mg–Al–Mn—RE;rare earth) and its composite AE42-C, which contains 23 vol% of randomly oriented carbon short fibers. Materials characterization, including density measurements, hardness testing, microstructures investigation, and compression testing at temperatures of 25, 150,and 300 °C, were conducted. Wear tests were performed under various loads and sliding distances. Wear mechanisms were also proposed based on the examination of worn surfaces using optical microscopy and scanning electron microscopy equipped with EDX(energy-dispersive X-ray spectrometry) analysis system. The hardness of AE42-23 vol% C composite is twice the hardness of the Mg matrix alloy AE42. Significant improvements to yield stress and compressive strength at temperatures of 25, 150, and 300 °C of the composite versus the AE42 alloy are achieved. Wear resistance of the composite is improved considerably versus that of the Mg alloy AE42 at the various sliding distances. Smearing of graphite on the worn surface produces a lubricating film that delays change from mild to severe wear of the composite, especially at high loads. EDX analysis of the worn surface shows oxidation of the matrix alloy at higher wear loads, and this mechanism decreases in the presence of carbon fibers under the same loads. Abrasive wear, oxidation, and plastic deformation are the dominant wear mechanisms for the alloy matrix AE42, whereas mainly abrasive wear is the wear mechanism of AE42-23 vol% C composite under the proposed testing conditions. 展开更多
关键词 Magnesium composites CARBON short fibers COMPRESSIVE STRENGTH WEAR resistance WEAR mechanisms
From waste hot-pot oil.as carbon precursor to development of recyclable attapulgite/carbon composites for wastewater treatment
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作者 Jie Tang Bin Mu +1 位作者 Li Zong Aiqin Wang 《环境科学学报:英文版》 SCIE EI CAS CSCD 2019年第1期346-358,共13页
The utilization of waste products as valuable materials was a technical imperative for waste management.In this study,the cost-effective attapulgite/carbon (APT/C)composite was developed for wastewater treatment using... The utilization of waste products as valuable materials was a technical imperative for waste management.In this study,the cost-effective attapulgite/carbon (APT/C)composite was developed for wastewater treatment using waste hot-pot oil as a carbon precursor through a facile one-step calcination process.The APT/C composite prepared at 300℃ exhibited the excellent adsorption capacity and rapid equilibrium rate over a broad pH range for the removal of various pollutants.More importantly,the removal ratios of the composites toward Methyl Violet and tetracycline still remained 77.6% and 60.2% of the initial adsorption capacity after ten adsorption-regeneration cycles via a facile thermal regeneration strategy,respectively. Beyond all doubt,this research provided a feasible and economical way for the sustainable utilization of waste hot-pot oil in wastewater treatment,achieving the concept of disposal waste with waste and recycling. 展开更多
关键词 WASTE hot-pot OIL CALCINATION Attapulgite/carbon composites Adsorption Thermal regeneration
Microstructural Characterization and Tensile Behavior of Rutile(TiO2)-Reinforced AA6063 Aluminum Matrix Composites Prepared by Friction Stir Processing
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作者 Sahayam Joyson Abraham Isaac Dinaharan +1 位作者 Jebaraj David Raja Selvam Esther Titilayo Akinlabi 《金属学报:英文版》 SCIE EI CAS CSCD 2019年第1期52-62,共11页
Rutile(TiO2) particle-reinforced aluminum matrix composites were prepared by friction stir processing. The microstructure was studied using conventional and advanced characterization techniques. TiO2 particles were fo... Rutile(TiO2) particle-reinforced aluminum matrix composites were prepared by friction stir processing. The microstructure was studied using conventional and advanced characterization techniques. TiO2 particles were found to be dispersed uniformly in the composite. Clusters of TiO2 particles were observed at a higher particle content of 18 vol%. The interface between the TiO2 particle and the aluminum matrix was characterized by the absence of pores and reactive layer.Sub-grain boundaries, ultra-fine grains and dislocation density were observed in the composites. TiO2 particles improved the mechanical properties of the composites. However, a drop in tensile strength was observed at a higher particle content due to cluster formation. All the prepared composites exhibited ductile mode of fracture. 展开更多
关键词 ALUMINUM matrix COMPOSITES FRICTION STIR processing RUTILE Microstructure TENSILE strength
石墨烯增强金属基复合材料中石墨烯分散处理工艺研究进展
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作者 梁倍铭 罗茂源 +2 位作者 张正杰 黄纪蓉 张修海 《热加工工艺》 北大核心 2019年第4期15-18,共4页
石墨烯电学、光学、热学和力学性能优异,作为增强体被广泛应用于金属基复合材料。本文综述了提高石墨烯在金属基体中分散性的方法,介绍了目前石墨烯在金属基复合材料中分散工艺的运用,并提出了一些新思路。
关键词 石墨烯 金属 复合材料 制备工艺 分散方法
聚乙烯醇缩丁醛/镀镍石墨复合材料薄膜的电磁屏蔽性能及机理 预览
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作者 王雪娇 杨向璟 温变英 《高分子材料科学与工程》 EI CAS CSCD 北大核心 2019年第5期51-56,共6页
采用溶液流延法制备了聚乙烯醇缩丁醛/镀镍石墨复合材料薄膜,重点考察了填料含量对其电磁屏蔽效能的影响,通过复介电常数、复磁导率的变化对其电磁屏蔽机理进行了探讨,并计算了不同填料含量时复合材料的电磁屏蔽效能理论值。实验结果表... 采用溶液流延法制备了聚乙烯醇缩丁醛/镀镍石墨复合材料薄膜,重点考察了填料含量对其电磁屏蔽效能的影响,通过复介电常数、复磁导率的变化对其电磁屏蔽机理进行了探讨,并计算了不同填料含量时复合材料的电磁屏蔽效能理论值。实验结果表明,随着镀镍石墨含量增加,复合材料的电磁屏蔽效能升高,当填料体积分数(φ)达20%时,其的电磁屏蔽效能可达45.5 dB(10 GHz)。复合材料的电磁屏蔽机理以电损耗为主。将电磁屏蔽效能的理论值与实测值对比发现,当填料含量较低时,实测值小于理论值,随着填料含量的增加,填料在基体中构成较完整的导电网络,两者之间的差距随着填料含量的增加逐渐缩小,当填料体积分数达20%时,实测值与理论值趋于一致。 展开更多
关键词 聚乙烯醇缩丁醛 镀镍石墨 电磁屏蔽 复合材料
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Effect of TiB2 content on microstructure and properties of in situ Ti–TiB composites 预览
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作者 Harshpreet Singh Muhammad Hayat +2 位作者 Hongzhou Zhang Raj Das Peng Cao 《矿物冶金与材料学报:英文版》 SCIE EI CAS CSCD 2019年第7期915-924,共10页
This study determined the optimal concentration of titanium diboride (TiB2) particles for the development of in situ titanium– titanium boride (Ti–TiB) metal matrix composites (MMCs) prepared by a conventional powde... This study determined the optimal concentration of titanium diboride (TiB2) particles for the development of in situ titanium– titanium boride (Ti–TiB) metal matrix composites (MMCs) prepared by a conventional powder metallurgy route to be used for industrial applications. The effect of concentration of TiB2 particles was studied by reinforcing TiB2 powder in different mass fractions (2wt%, 5wt%, 10wt%, and 20wt%) into pure Ti powder during the fabrication process. The MMCs were sintered at high temperatures under vacuum. The transmission electron microscopy (TEM) results revealed the formation of needle-shaped TiB whiskers, indicating that in situ reaction occurred during vacuum sintering of the powder compacts. All the composite samples had a high sintered density, and the hardness of the composites increased with an increase in the mass fraction of reinforcement. Mechanical and tribological properties such as flexural strength, impact, and wear properties were determined and found to be dependent on the mass fraction of the reinforcement. However, the mechanism for the in situ reaction needs further investigation by high-energy in situ X-ray diffraction techniques. 展开更多
关键词 titanium matrix COMPOSITES powder METALLURGY X-ray DIFFRACTION mechanical properties wear
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