摩托车活塞硬质阳极氧化处理的研究

对高硅铸铝活塞的阳极氧化工艺进行研究探讨,研究了电源脉冲对膜性能的影响.合格样品通过了摩托车厂的检测验收.结果表明脉冲氧化法制备氧化膜性能最佳.     

光度法测定钨丝表面的微量铝

本文研究了 Al 与甲基百里酚蓝、溴化十六烷基吡啶生成橙红色络合物的显色反应。络合物的最大吸收波长540 nm，摩尔吸收系数2．48×10~4 L·mol~(-1)·cm(-1)，Al 含量0-35μg/25mL范围内服从比尔定律。方法用于钨丝表面微量铝的测定，结果满意。     

溶胶-凝胶浸渍法制备氧化铝膜的形貌表征

Alumina membranes without pinholes and cracks were prepared by the sol-gel process using anunordum aluminium sulphate as the starting material. The effects of different preparing conditions on morphology characteristics of the membrane were investigated by scanning electron microscopy and 3D rotational microscopy. The preparing conditions include the amounts of drying control chemical additives （DCCA）, sintering procedure and sol-gel concentration. The results showed that PVA is a good crack-preventing reagent and the morphology of supported membranes was affected by ninny factors, including Al2O3 concentration, PVA/Al2O3 ratio, heating rate, membrane thickness and intrinsic defects of the substrate surface.     

增敏火焰原子吸收法测定复方氢氧化铝片中的铝

研究了以铁为底液,用富燃空气-乙炔火焰原子吸收光谱法间接测定铝的条件。结果表明,在4.0μg/mL铁的溶液中,铝的线性增敏范围为0-0.5μg/mL,相关系数(r)0.9993。用本方法测定复方氢氧化铝片中的铝,RSD(n=6)2.8%,加标回收率96%-104%,结果令人满意。     

硫酸铝-离子液体复合催化剂催化合成草莓酯

以硫酸铝/离子液体[bmim][H2PO4]为复合催化剂,研究了乙酰乙酸乙酯和1,2-丙二醇缩合反应制备了新型香料草莓酯.结果表明,复合催化剂对缩合反应具有良好的催化活性和选择性,在优化的反应条件：乙酰乙酸乙酯用量为11.4 mmol,1,2-丙二醇与乙酰乙酸乙酯的比为1.2∶1,催化剂用量为0.25 mmol,离子液体用量为1 mL,反应温度100℃,反应时间1.5 h,乙酰乙酸乙酯的转化率达到70%以上,选择性达到99.0%以上.同时,反应结束后,复合催化剂与有机物自动分层,催化剂的循环使用易于实现.     

Finite Element Analysis for In-Plane Crushing Behaviour of Aluminium Honeycombs

A number of finite element simulations were performed to analyze the in-plane crushing behaviour of aluminium honeycombs and the results are presented and discussed. The simulations include both X1 and X2 cases. All the analyses are quasi-static, and can be divided into three groups, which are designed to investigate the effects of cell size, foil thickness and yield stress of the foil material, respectively, on the structural response of honeycombs. The result indicates that these factors can significantly affect the plateau stresses of honeycomb cellular structures in both directions, and the plateau stresses in X2 direction are slightly smaller than those in X1 direction. The simulation results were further compared with published theoretical predictions and show higher values. The difference was then analyzed and a new expression for the plateau stress of honeycombs was suggested.     

铝合金轴心受压构件截面不对称性系数研究

铝合金轴心受压构件需要引入系数ηas来考虑截面不对称性带来的不利影响.在大量数值分析的基础上,提出了系数ηas的计算公式,可以作为设计计算的依据.提出了广义的稳定计算系数的概念,用以在确定铝合金轴心受压构件的屈曲抵抗力时考虑系数ηas的影响,这样可与惯用设计方法相一致.     

活塞挤压铸造用高性能铝合金材料的制备研究

针对现有铝合金材料不能满足动力机械用的薄壁高强韧铝合金零件的要求,通过改进材料配方和制备方法,得到符合铝合金挤压铸造工艺要求的高强韧新材料。实验结果表明,利用该材料生产的铸件平均抗拉强度达到300MPa,高温抗拉强度268MPa,伸长率超过1.73％,硬度超过HB95,微观组织晶粒致密,基本无缩松缩孔等缺陷,达到了高性能要求。     

Mitigation of Blast Effects on Aluminum Foam Protected Masonry Walls

Terrorist attacks using improvised explosive devices (lED) can result in unreinforced masonry (URM) wall collapse.Protecting URM wall from lED attack is very complicated.An effective solution to mitigate blast effects on URM wall is to retrofit URM walls with metallic foam sheets to absorb blast energy.However,mitigation of blast effects on metallic foam protected URM walls is currently in their infancy in the world.In this palaer,numerical models are used to simulate the performance of aluminum foam protected URM walls subjected to blast loads.A distinctive model,in which mortar and brick units of masonry are discritized individually,is used to model the performance of masonry and the contact between the masonry and steel face-sheet of aluminum foam is modelled using the interface element model.The aluminum foam is modelled by a nonlinear elastoplastic material model.The material models for masonry,aluminum foam and interface are then coded into a finite element program LS-DYNA3D to perform the numerical calculations of response and damage of aluminum foam protected URM walls under airblast loads.Discussion is made on the effectiveness of the aluminum foam protected system for URM wall against blast loads.     

1235铝合金二步电解法着黑色工艺研究

采用二步交流电解着色法，研究了硫酸阳极氧化膜、着色液成分对1235铝合金着色效果的影响，提出了最佳工艺条件。研究表明：当硫酸阳极氧化膜厚为10μm。左右、在15V交流电以及着色液中含20g／L SnSO4和Ⅱ号添加剂着色时，可获得均匀、耐蚀性好、色泽光亮的深黑色阳极氧化膜。