Guoqing CHEN
,
Kaifeng ZHANG
,
Wenbo HAN
,
Junting LUO
材料科学技术（英）
A series of alumina-zirconia composites with various grain sizes were prepared from the nano-sized powders with different agglomerations. Microstructural analysis of the sintered compacts indicates that the as-sintered material is a typical intra/inter granular nanocomposite with uniform distribution of the zirconia grains in the alumina matrix. Superplastic deep drawing test under different conditions demonstrates that dense Al2O3/ZrO2 samples with average grain size of 230 nm can be elongated to a dome height of at least 12 mm at the punch rate of 0.6 mm•min-1 at 1400℃. Further drawing tests show that for the composites with larger grain size, such elongation cannot be achieved at such a strain rate.
关键词:
Nanocomposite
,
null
,
null
,
null
Wei WU
,
Lailong LUO
,
Guangwen CHU
,
Shengjun BAI
,
Haikui ZOU
,
Jianfeng CHEN
材料科学技术（英）
A novel route to prepare nanocomposites was illustrated through preparing overbased calcium petroleum sulfonate lubricating oil detergent, where the rotating packed bed (RPB) was used as reactor in place of conventional reaction vessel. The results showed that the carbonation efficiency is improved, the raw materials consumption is reduced, and the dispersibilities, sizes and morphologies of nano-sized CaCO3 particles in overbased detergent are enhanced. It is deduced reasonably that this route can be extensively applied to nanocomposites preparation in appropriate conditions and would be a platform technology in this field.
关键词:
Nanocomposite
,
null
,
null
,
null
Song Ye Yidong Hou Renyi Zhu Shulong Gu Jingquan Wang Zhiyou Zhang
材料科学技术（英）
Silver nanoparticles (Ag NPs) were successfully assembled in porous anodic alumina (AAO) templates via a green silver mirror reaction. The Ag NPs/AAO composite templates then were characterized by field emission scanning electron microscopy (FESEM), energy-dispersive X-ray microanalysis (EDX), and X-ray diffraction (XRD). Furthermore, the photoluminescence (PL) properties were also investigated. Compared with the blank AAO, the PL intensity of Ag NPs/AAO templates are enhanced and the maximum enhancement is 2.58 times. Based on the local electric field enhancement e®ect, the theoretical values were also deduced, which are basically coincident with the experimental.
关键词:
Nanocomposite
Kui LIANG
材料科学技术（英）
A nanocomposite of nickel oxide/carbon nanotubes was prepared through a simple chemical precipitation followed by thermal annealing. The electrochemical capacitance of this electrode material was studied. When the mass fraction of CNTs (carbon nanotubes) in NiO/CNT composites increases, the electrical resistivity of nanocomposites decreases and becomes similar to that of pure CNTs when it reaches 30%. The specific surface area of composites increases with increasing CNT mass fraction and the specific capacitance reaches 160 F/g under 10 mA/g discharge current density at CNT mass fraction of 10%.
关键词:
Nickel oxide
,
null
,
null
,
null
Sam ZHANG
,
Deen SUN
,
Yongqing FU
材料科学技术（英）
The recent development in the field of nanocomposite coatings with good mechanical properties is critically reviewed in this paper. The design principle and materials selection for the nanocomposite coatings are introduced. Different methods for the preparation of superhard nanocomposite coatings are described with emphasis on the magnetron sputtering. Based on recent theoretical and experimental results regarding the appearance of superhardness in nanocomposite coating, lattice parameter changes, crystallite size, microstructure and morphology are reviewed in detail. Also emphasized are the mechanical properties (especially on hardness) and the ways by which the properties are derived.
关键词:
Superhard
,
null
,
null
Meisam Shabanian
,
Mohsen Hajibeygi
,
Mehdi Roohani
新型炭材料
doi:10.1016/S1872-5805(15)60199-8
首先通过壬二酸和双(对-羧苯基)苯基氧化膦直接缩聚反应得到半芳香聚酰胺( PA) ,采用溶液共混方法,以多壁碳纳米管( CNTs)增强PA得到新型纳米复合材料. 通过TG-DSC和微尺度燃烧量热法探讨CNTs对复合材料的热性能和可燃性能的影响. 当CNT添加量为5%时复合材料的失重率比纯PA提高5%,热分解温度提高70 ℃. 与纯PA相比,复合材料的热释放速率降低,这表明CNTs能提高PA的阻燃性.
关键词:
多壁碳纳米管
,
纳米复合材料
,
聚酰胺
,
阻燃
新型炭材料
doi:10.1016/S1872-5805(12)60023-7
采用TiC14水解法对表面酸功能化的碳纳米管(CNTs)进行TiO2涂层,然后通过程序升温还原(TPR),使TiO2涂层转变为Ti涂层.利用SEM、TEM、XRD和EDAX对CNTs、CNT/TiO2纳米复合材料和Ti涂层CNTs进行表征.结果表明:超声波酸功能化CNTs后,可将TiO2成功地涂覆于CNTs表面;在850℃下、H2/Ar氛围中,通过TPR可将TiO2涂层还原为金属Ti涂层.该Ti涂层对CNTs和其他金属形成复合材料非常重要.
关键词:
涂层
,
纳米复合材料
,
碳纳米管
,
钛
