利用普通台钻床进行搅拌摩擦焊接教学实验研究

根据搅拌摩擦焊接原理,自行设计了试件夹具与行走机构和搅拌头,利用实验室现有的普通钻床Z512进行了搅拌摩擦焊接工艺试验,通过焊后进行的一系列接头检测及切断面检查和接头力学性能测试表明,厚板焊接接头性能良好,薄板因焊缝重叠率较高,强度偏低。但可以满足搅拌摩擦焊接的教学需求。     

滑块-齿轴块-齿环压铸模圆弧抽芯机构的设计

铸件带有圆弧形孔时,其孔的抽芯和成形是压铸模具设计与制造的难点之一.圆弧形孔型芯的抽芯轨迹为曲线,抽芯过程中孔容易变形,引起孔的形状和尺寸不能满足要求,且抽芯机构容易出现故障.文中设计出新颖的滑块-齿轴块-齿环抽芯机构,借助开模力提供抽芯动力.实际生产应用表明,设计的抽芯机构可以保证圆弧形孔成形质量的同时,模具结构简单、制造成本低、传动效率高、抽芯平稳可靠.     

装饰表层低压一体注射绿色模具研究与应用

介绍了装饰表层低压一体注射绿色模具的优势和技术原理,从热流道系统、模架、面料挂针机构、面料压块机构、电控柜顺序控制系统、冷却系统等几个方面阐述了该类模具的关键技术和解决方案,将其应用到中低端汽车内饰件的生产制造,可更好地解决新车的环保问题,消除车内残存的有害物质,具有广阔的市场前景。     

Promoting the Li storage performances of Li2ZnTi3O8@Na2WO4 composite anode for Li-ion battery

In this work, a reasonable strategy for the construction of Li₂ZnTi₃O₈@Na₂WO₄ composite was employed to promote the Li storage performances of Li₂ZnTi₃O₈. The Li₂ZnTi₃O₈@Na₂WO₄ composites (5, 10, and 15 wt%) were then prepared by a solution dispersion method. The introduction of Na₂WO₄ does not change the structures of the samples and they show similar morphologies with particle sizes from 100 to 200 nm. Suitable amount of Na₂WO₄ modification effectively improves the electrochemical performance of Li₂ZnTi₃O₈. Li₂ZnTi₃O₈@Na₂WO₄ composites (0, 5, 10, and 15 wt%) deliver the discharge/charge capacities of 137.4/136.4, 164.2/162.3, 189.2/188.1, and 154.5/153.3 mAh g^?1 at 0.5 A g^?1 after 100 cycles, respectively. Li₂ZnTi₃O₈@Na₂WO₄ composites (10 wt%) has the highest reversible capacities among all samples. The Na₂WO₄ shell with an excellent electronic conductivity can reduce electrode polarization, decrease the charge transfer resistance, enhance the Li-ion diffusion coefficient of Li₂ZnTi₃O₈, and then improve the electrochemical kinetics of composites. In addition, the formation of Ti–O bonds at the interface can be helpful for the stabilization of the composite, being beneficial for the improvement of their cycling stabilities. These results reveal that Na₂WO₄ coating is a facile and effective strategy to promote the Li storage performance of Li₂ZnTi₃O₈.     

Microstructure and Mechanical Properties of Laser Solid Formed Ti-6Al-4V Alloy Under Dynamic Shear Loading

To investigate the mechanical properties of the Ti-6Al-4V alloy fabricated by laser solid forming technology, both static and dynamic shear tests were conducted on hat-shaped specimens by a servohydraulic testing machine and an enhanced split Hopkinson pressure bar system, over a temperature range of 173-573 K. The microstructure of both the original and deformed specimens was characterized by optical microscopy and scanning electron microscopy. The results show that: (1) the anisotropy of shear properties is not significant regardless of the visible stratification and the prior-β grains that grow epitaxially along the depositing direction; (2) the ultimate shear strength of this material is lower than that of those Ti-6Al-4V alloys fabricated by forging and extrusion; (3) the adiabatic shear bands of approximately 25.6-36.4 μm in width can develop at all selected temperatures during the dynamic shear deformation; and (4) the observed microstructure and measured microhardness indicate that the grains become refined in adiabatic shear band. Estimation of the temperature rise shows that the temperature in shear band exceeds the recrystallization temperature. The process of rotational dynamic recrystallization is considered to be the cause of the grain refinement in shear band.     

Function and performance of silicone copolymers(II): Syntheses and interfacial behavior of siliconized acrylic copolymers

Polysiloxane‐containing copolymers were synthesized and characterized by nuclear magnetic resonance and elemental analysis. These copolymers were neutralized by triethylamine. The copolymers could be self‐emulsified to form emulsions in water with and without cosolvent PCS and exhibited excellent defoaming abilities. These copolymers were also used as emulsifiers to emulsify silicone oil in water to form stable oil‐in‐water emulsions. This emulsion again exhibited defoaming properties, more efficiently than that of the self‐emulsified emulsion of siliconized acrylic copolymer (SAA). © 1999 John Wiley & Sons, Inc. J Appl Polym Sci 71: 805–811, 1999     

镁盐在反应染料废水治理中的应用研究

以含有活性艳红、活性艳黄、活性艳蓝等多种反应染料的高浓度染料废水为试验对象,在反应时间、ｐＨ 值、镁盐加入量、Ｃａ（ＯＨ）２ 的协同影响、与其他絮凝剂比较等几方面系统地研究了镁盐在反应染料废水ＣＯＤ 去除及脱色中的应用。结果表明：对于反应染料废水,镁盐对其ＣＯＤ 去除及脱色效果优于其他试剂。实验最佳条件为ｐＨ＞ １０．５,反应时间０．５ｈ。Ｃａ（ＯＨ）２ 与镁盐吸附处理具有协同作用     

超高分子量聚乙烯微孔材料微观结构形成机理的研究 (I)相分离过程对微观结构的影响

超高分子量聚乙烯（ＵＨＭＷＰＥ）微孔材料是以ＵＨＭＷＰＥ为聚合物基体的一种新型功能性材料,利用这种材料能够实现非均相分离、过滤及离子通透等多种单元操作过程,可广泛地应用于化工、医药、能源等领域［１］。针对ＵＨＭＷＰＥ物料的特殊性能,采用热致相分离方法［２］（ＴＩＰＳ）进行微孔材料的成型。ＴＩＰＳ过程涉及到聚合物－溶剂二元体系,因此对ＴＩＰＳ的二元体系热力学过程进行了研究。同时,二元体系的相分离过程对微观结构有很大影响。结合ＵＨＭＷＰＥ－石蜡油二元体系相图可以知道,该二元体系的相分离由两种不同的相分离过程组成———固液相分离和液液相分离,研究了两种分离过程对最终微观结构的影响。     

新能源及可再生能源投资建设项目财务评价有关问题的思考

以光伏发电、风力发电及水力发电等投资建设项目在财务评价中遇到的问题为出发点,通过实例计算、分析,总结出随着市场经济发展变化,如何合理地利用财务评价计算条件,为企业的项目投资决策以及成本费用的控制更好地服务。同时在分析过程中再次思考财务评价计算各影响因素,对财务现金流有了新的认识和其在财务评价中的重要性,为今后财务评价设计工作的开展开拓了思路。     

快易收口网在凯乐塔水电站施工中的应用

介绍了快易收口网的特点、施工工艺流程,指出对其施工质量的要求及应注意的事项。快易收口网在几内亚凯乐塔水电站工程施工中的应用,取得了较好的经济和社会效益。