INJECTION MOLDED TUNGSTEN HEAVY ALLOY

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A study on the development of engineering plastic piston used in the shock absorber

A piston is an important component of the shock absorber which determines comfortable riding and handling. Conventional piston is made of metal powder that is pressed in a mold, and then sintered at high temperatures below the melting point before machining processes such as drilling, sizing and teflon banding. This study aims at cutting down cost and weight, and improving the process by replacing the traditional sintering process used for manufacturing the shock absorber with the injection molding process adopting engineering plastics as raw material. To analyze the injection molding process, we used the commercial program, MOLDFLOW, and obtained an optimal combination of the process parameters. In addition, by comparing the engineering plastic piston with the metal powder piston through the formability and the performance experiments, we confirmed the availability of this alternative process suggested.     

半导体封装中的可视化技术

树脂传递模封装是广泛使用的可靠性量产性均好的半导体封装方法。但随着封装体（PACKAGE）尺寸的日益薄型化和多腿化,不可避免地会发生与树脂在模腔中流动状态有关的空隙等使制品失效的不良模式。这样,通过观察树脂流动状态及对空隙的分布进行研究,对于研究空隙发生机理从而抑制空隙发生具有重要意义。本文将着重介绍两种新的研究实验方法：（1）应用玻璃嵌入式新型可视化模具观察树脂在模腔中的流动状态;（2）采用超声波探查图像装置（简称SAT）进行树脂封装体内部的观察。     

金属粉末注射成形技术的现状和发展动向——Ⅲ.发展动向

综合阐述了金属粉末注射成形(MIM)的技术现状和产业化发展状况,并从粘结剂的选择和优化设计、新型粘结剂的开发和实用化、脱脂模型和脱脂动力学研究、尺寸精度过程控制几个方面评述了金属粉末注射成形技术重要的发展动向。     

Experimental and numerical study of the impact behavior of SMC plates

Steel components absorb impact energy by plastic deformation whilst composite materials absorbing it by damage mechanisms such as fiber debonding, fiber fracture, and matrix cracking. Therefore, in order to properly substitute metal components with composite ones in industrial applications, the impact property of composite materials must be well known. In this study, the impact behavior of sheet molding compounds (SMC), which is widely used in automobile industry due to its relatively low cost and high productivity, was examined both experimentally and numerically. In order to investigate the impact behavior of SMC, an experimental study was carried out by setting up a drop weight impact test system. Using this system, the dissipated impact energies of SMC flat plates were measured to investigate the influence of the mass and shape of impactor, initial velocity, and specimen thickness on the impact behavior.

For numerical predictions, a modified damage model for SMC was developed and adopted in the user defined material subroutine of the commercial simulation program LS-DYNA3D. For the sake of improving efficiency of impact simulations, the SMC material property was determined in consideration of the local differences of the fiber volume fractions. The dissipated impact energies under various conditions and the reliability of the developed impact simulation process were examined through comparisons of the predicted data with the experimental results.

From this comparison, it was found that, in the scope of current study, the specimen thickness is the most important parameter that should be considered in the design of SMC components for the aspect of impact behavior.     

The influence of fibre properties of the performance of glass-fibre-reinforced polyamide 6,6

We discuss the effect of fibre strength and diameter on the balance of mechanical properties of glass-reinforced polyamide 6,6. The results show that the elastic properties of injection-moulded short-glass-fibre-reinforced polyamide 6,6 are not strongly influenced by fibre diameter in the 10–17 micron range. The ultimate properties of these composites (strength and Izod impact behaviour) showed a clear dependence on fibre diameter and were increased by the presence of high-strength S-2 glass fibres. The relationship between the observed mechanical properties and the length, diameter and orientation of the fibres is explored. We have measured fibre length as a function of diameter in composites containing a single glass-reinforcement product and blends of two glass products. The reduction in glass-fibre length from glass-fibre production to final composite moulding has been followed step by step. The final composite mechanical properties, the fibre length, strength, diameter and orientation are all inter-related.     

轮南油田超深井重复酸化增注工作液

根据储层特征、储层的敏感性、前期地层损害及重复酸化等因素,通过大量室内试验,研究出了适合塔里木轮南油田二井区的重复酸化增注工作液,即有机缓速酸体系。该体系既满足了深度酸化和重复酸化工作液要求,又能降低地层二次损害。通过在LN2-4-6和LN2-2-7井现场应用,取得了良好的酸化效果,表明该酸化工作液与该井区储层的适应性好。     

IMC系列缓蚀剂研究及在我国油田的应用

近年来,中科院金属腐蚀与防护所针对我国油气生产中遇到的ＣＯ２、Ｈ２Ｓ高矿化度污水或溶解氧的腐蚀问题,结合不同油田的工况,腐蚀发生的特点和原因,开展了ＩＭＣ系列缓蚀剂的研究,开发工作,对其缓蚀作用机理进行了研究,初步形成了具有特色的系列缓蚀剂技术或产品,并在我国多个油田得到了应用,本文是对这些工作的概括总结。     

注入水缓蚀阻垢剂KL0305A及其应用

在原用双组份双包装缓蚀阻垢剂ＫＬ０３０５的基础上研制了单一包装的性能更好的改进型缓蚀阻垢剂ＫＬ０３０５Ａ,本文介绍了ＫＬ０３０５Ａ的室内性能评价结果及在克拉玛依油田五区南注入水处理中应用的情况。ＫＬ０３０５Ａ在五区南注水中具有良好的缓蚀阻垢效果,也能适应克拉玛依油田其它各区块注入水的水质。     

全降解生物质包装填充材料的开发及其性能研究

目的 开发一种环境友好的可降解生物质包装材料,旨在推进绿色物流发展和环境保护。方法 采用生物原位成型技术一步成型制得全降解生物质包装填充材料ECO生物质板。并对其防水性能、动态缓冲性能、阻燃性能、生物降解性进行测定。结果 ECO生物质板的接触角为104.2°,缓冲系数C均大于3.0,氧指数>35,样品在埋土20 d后出现了部分破损,50 d后降解成小碎片和粉状。结论 利用秸秆等农林废弃物制备的ECO生物质板具有较好的缓冲性能,可以防水阻燃,并且易于生物降解。与其他可降解材料相比,具有价格低廉、可推广性强等优点,有巨大的市场竞争力,是一种具有广泛应用前景的新型缓冲包装材料。