采用氮气氛保护的再流焊接技术

叙述了先进再流焊接技术的新发展,描述了提高BGA再流焊接效果的工艺要点,优化倒装芯片再流焊接和固化的新方法。最后,讲述了先进的降低氮消耗量的方法即:通过最大限度地提高潜在收益,以促进再流焊接技术的发展,以此来满足装配厂商的需要。     

金线断口的分析

运用扫描电子显微镜技术，对金线断口观察分析，讨论金线在拉伸过程中断裂时断口形貌及断裂的原因，发现，断裂是由于金锭中的气体和杂质引起的，并提出改进生产工艺的意见。     

对球磨机衬板选材的一点看法

球磨机是选矿工业中的主要设备。为了保护球磨机筒体内表面不受磨损和控制钢球在简体内的运动轧迹，筒体内铺有高锰钢衬板。主要介绍球磨机衬板装在不同部位，应选不同材质的衬板。     

高炉渣处理综述及螺旋法水渣处理工艺的应用

介绍了高炉渣处理方法。通过对不同高炉水渣处理系统进行分析对比,指出螺旋法水渣处理工艺的优缺点,分析了本工艺应用的现实可能性,介绍了主要的设备和工艺流程布置方案。     

SS-I型螺旋板换热器内泄漏的判断与处理

介绍了SS -I型螺旋板换热器产生内泄漏后对漏点的判断方法、处理技术及要求 ,经实践检验 ,效果显著     

贵冶二期闪速炉失重给料螺旋运行实践

本文介绍了贵冶失重给料螺旋的性能、生产准备、点检维修、技术攻关、缺陷改进。     

20MnSi螺纹钢用方坯试制

介绍了２０ＭｎＳｉ螺纹钢筋用方坯的试制过程及产品质量，试制表明７５和９９方坯的冶炼、铸锭、轧制工艺可行，化学成分及用该方坯轧成的螺纹钢筋性能满足ＧＢ１４９９－９１标准，可转入正式生产。     

面阵列封装器件的贴装技术

面阵列封装器件在电子产品中的使用率逐年上升,如何实现其高速贴装是影响生产线效率的重要因素。从不同的角度论述了面阵列封装器件实现高速贴装的手段与技术。     

BGA封装技术研究

介绍了 BGA技术的研究现状 ,着重从芯片互连、基板材料及封装设计等方面讨论了该技术的发展前景。     

An experimental validation of a specific energy-based approach for comminution

In a recent paper [Khumalo, N., Glasser, D., Hildebrandt, D., Hausberger, B., Kauchali, S., 2006. The application of the attainable region analysis to comminution. Chemical Engineering Science 61, 5969-5980] it was shown that the attainable region approach could prove useful in designing better comminution circuits. Fundamental to this approach was the assumption that the rate of comminution was only determined by the specific energy within the device. This paper shows experimentally that this assumption holds for a batch ball mill.The system presented here considered breakage of mono-sized feed particles in a laboratory ball mill into two distinct progeny size classes. The population balance model was successfully used to model the experimental products and the results were represented geometrically in a two-dimensional space. The resulting geometric structure can be used to solve process synthesis and optimization problems simultaneously.It was found that the breakage rate parameter out of size class 1 changes with time but exhibits an exponential relationship with an asymptote. It is hypothesized that this asymptote is the rate of breakage at long grind times or in well-mixed, steady-state continuous systems. It is shown that the parameters of the process depend only on the specific energy. This was one of the assumptions that was made in the construction of the attainable region. Thus, equipment selection and operating conditions only require one to match the required specific energy.