Eu（DBM）_3Phen/PS复合纤维的制备与发光性能

采用静电纺丝法与无皂乳液法相结合制备了稀土配合物/聚合物复合纳米纤维Eu（DBM）3Phen/PS.采用扫描电镜（SEM）、红外光谱（FT-IR）和荧光光谱（FS）等,对纤维的形貌和发光性质进行了表征.实验结果表明,随着PS浓度的增加,所制备的纤维直径逐渐增大,纤维的发光强度也逐渐递增,荧光寿命逐渐增长.     

Recycling of aluminum from fibre metal laminates

Recycling of aluminum alloy scrap obtained from delaminated fibre metal laminates (FMLs) was studied through high temperature refining in the presence of a salt flux. The aluminum alloy scrap contains approximately mass fraction w(Cu) = 4.4%, w(Mg) = 1.1% and w(Mn) = 0.6% (2024 aluminum alloy). The main objective of this research is to obtain a high metal yield, while maintaining its original alloy compositions. The work focuses on the metal yield and quality of recycled Al alloy under different refining conditions. The NaCl-KCl salt system was selected as the major components of flux in the Al alloy recycling. Two different flux compositions were employed at NaCl to KCl mass ratios of 44:56 and 70:30 respectively, based on either the eutectic composition, or the European preference. Different additives were introduced into the NaCl-KCl system to study the effect of flux component on recycling result. Although burning and oxidation loss of the alloying elements during re-melting and refining take place as the drawbacks of conventional refining process, the problems can be solved to a large extent by using an appropriate salt flux. Experimental results indicate that Mg in the alloy gets lost when adding cryolite in the NaCl-KCl salt system, though the metal yield can reach as high as 98%. However, by adding w(MgF₂) = 5% into the NaCl-KCl salt system (instead of using cryolite) all alloying elements were well controlled to its original composition with a metal yield of almost 98%.     

Formation of nanometer coherent structures during spinodal decomposition and ordering coexistence phase transformation in Fe-24Al alloys

The nanometer coherent structure evolution of spinodal decomposition and ordering coexistence phase transformation in Fe-24Al alloys is investigated by the microscopic phase field kinetic model. The results show that the concentration and long-range order parameters all continuously change towards to their equilibrium values during phase transformation. With the increase of elastic interaction energy, the anisotropy along [01] or [10] elastic soft direction is more obvious and the time reaching equilibrium state is also shortened. According to the results, the formation of nanometer coherent structures during phase transformation is composed of the initial decreasing stage of order degree stage, the incubation stage, the continuous increasing stage of concentration order parameter and long-range order parameter, and the later stable stage. The spinodal decomposition and ordering is interaction; the initial ordering stage is a necessary condition of the coexistence phase transformation. The nanometer coherent structures are not found to grow during the whole phase transformation. The simulation results are in accordance with the results in experiment obtained by the aging treatment in Fe-24Al alloys.     

Ni-Mn合金的去合金化

在氩气保护下,应用真空熔炼炉分别制备了Ni30Mn70与Ni55Mn45合金.测定了这两种合金在(NH4)2SO4溶液中的圾化曲线,然后对其进行去合金化实验.结果显示,Ni30Mn70合金在1M(NH4)2S04溶液中去合金化后,试样表面呈现“泥裂”结构.Ni55Mn45在1M(NH4)2S04溶液中不同电位下去合金化...     

车用尼龙及其复合材料的性能与应用

尼龙及其复合材料是汽车常用的塑料材料之一,研究其结构与性能有助于扩大其在汽车上的应用.文章以汽车上应用最广泛的尼龙、玻璃纤维增强尼龙、尼龙聚丙烯合金和尼龙丁腈橡胶合金材料为例,分析它们内部结构的不同以及在力学性能上的区别.针对不同材料的不同性能,列举了这些材料制造的具体零部件和使用现状.由于尼龙及其复合材料具有很高的性价比,其应用范围必将不断扩大.今后对尼龙及其复合材料缺陷的优化和改进,将成为这种材料的研究方向.     

合金电缆在污水处理行业的应用前景

通过对比新型合金电缆与传统铜芯电缆的各项技术参数,并结合水处理行业的电缆应用现状,论证了合金电缆在以水处理行业为代表的市政基础设施工程中具有较好的应用前景,并提出了其在实际应用中的设计要点。     

Au40 Pd20合金原子团簇惰性气体氛围凝聚动力学行为研究

采用蒙特卡洛方法,结合Tight-binding和Lennard-Jones作用势,对Ar原子氛围中初始随机分布的40个Au原子和20个Pd原子体系的凝聚动力学行为进行了研究．Ar原子氛围对合金团簇的形成过程及其形貌尺寸有重要影响,计算表明：不同的Ar原子氛围得到的Au40 Pd20合金原子团簇凝聚结构形貌不同;在降温退火过程中, Ar原子密度大时,得到的Au40 Pd20合金原子团簇结构更加紧凑,且Au40 Pd20合金团簇凝聚相变温度更高;而恒温退火过程中,则发现较高温度时能得到较为紧凑的合金团簇结构,Ar原子密度越大,系统到达平衡的动力学时间更短．模拟结果能为惰性气体冷凝方法中实现合金团簇结构与形貌可控制备提供参考．     

汽车用铝锡铜轴瓦合金热膨胀性能研究

对3种常见的AlSn6Cu、AlSn20Cu、AlSn30Cu铝锡铜合金的热膨胀性能进行了研究。结果表明，随着合金中Sn含量的增加，组织中B(Sn)相增加，膨胀系数减小；高熔点的Cu元素固溶于α(Al)相中，使α(Al)晶格常数下降，能有效抑制合金膨胀系数随温度的急剧变化。     

稀土改性冷补材料在国防公路养护中的应用

通过对国防公路路面养护与修补存在问题分析,研究了稀土改性冷补材料的机理,总结了稀土改性沥青路面低温冷补养护材料具备性能良好、操作简便、无专用设备和气候条件要求等特点,该材料在低温条件下修补,既能达到传统热补沥青的要求,又能弥补热补施工的缺点。为未来公路的养护,特别是对国防公路的建设、维修和战时抢修提供了更为有效的方法。     

钢质高速船船体长效防锈体系(一)——喷涂锌铝伪合金涂层体系

<正>0前言2007年我国人均拥有钢产量接近世界水平的两倍。改变以前基本建设的材料选用政策,更多的选用钢材去建造房屋、桥梁、港口和船舶,就会成为必然的趋势。因此进行耐腐蚀保护提