导电胶在固化中电阻的自动测量采集系统设计研究

导电胶作为元铅连接材料的一种，近年来在微电子封装、组装中越来越受重视。本文简单介绍了导电胶的分类、组成，重点介绍一种新的导电胶电阻的测试方法和导电胶在固化过程中电阻的自动测量采集系统设计，通过最后选用的导电胶实验证明本文设计的系统完全能够满足导电胶电阻的测试要求。     

特种CCD传感器及系统研发策略研究

分析大感光像素特种CCD的工艺特点及对系统整体性能参数的影响。提出满势阱光电子数与CCD阱面积A和阱深W的积有关，CCD分辨间隔取决于光电子统计涨落，大像素提高了CCD感光灵敏度和动态范围，对工艺定位要求低，可单件或少量生产，适合我国现有人员、技术、设备和资本经济实力。用DSP＋CPLD、FPGA器件和VI软件制作控制器，强化系统整体配置；寻找各行各业需要、技术对路的特种CCD开展研发，实行定单生产，滚动积累开发，走差异化发展道路，是发展我国IT技术产品的策略。     

挠性覆铜板技术发展

文章概述近年来挠性覆铜板的迅速发展,不仅是数量上的增加,在品质方面也有很大变化。在综合评估各种工艺路线的基础上,提出我国挠性覆铜板今后技术发展的基本方向。     

介质滤波器银层厚度与附着力对耐焊接热影响

通过化学方法制作无损伤坯体和银层的测量台阶,采用油墨制作测量台阶的图案,通过测高仪精确测量出银层厚度。将不同银层厚度的介质滤波器做耐焊接热可靠性试验,得到多孔介质滤波器最合适的银层厚度区间。结果表明,多孔介质滤波器烧银温度在820℃时,银层附着力达到最大点;采用化学法制作的测量台阶,通过接触法测量误差最小;多孔介质滤波器银层厚度≥0.015mm,能满足耐焊接热的可靠性要求。     

微机特技扫换图形发生器

本文介绍一种新型的电视特技设备,其工作原理、设计思想和电路结构与现有的扫换特技设备均不相同。该设备不用传统的“三基波迭加法”,而采用单片微机直接产生扫换波形,因此功能齐全、硬件简单、性能稳定可靠、易于生产,并具有较高的性能价格比。本文对“微机特技”的基本设计思想、电路工作原理和结构、软件设计及关键技术都一一作了介绍。     

特种车辆行程储备的计算方法研究

在论述了特种车辆燃油系统最大行驶里程技术指标的定义和一般计算方法的基础上,分析了影响计算准确度的因素,并提出了最大行驶里程推荐的计算方法及其研究方法,同时提供了多种车辆在各种路面的实车试验数据,可为今后新设计车辆燃油系统的设计计算提供有价值的参考.     

混合动力特种车APU控制系统开发

本文设计的辅助动力单元(APU)控制系统采用恒压控制的结构.首先优化了柴油发动机工作区域,之后设计了发动机转速变增益PI控制器和发电机调压器.最终在APU试验台架上的试验结果验证了发动机转速控制器的能够对发动机实际工作点有很好的控制效果,并且APU的功率响应特性和输出电压的稳定性均能满足车载特种用电设备的要求.     

军用热电池钛合金壳体材料应用试验研究

介绍了军用热电池的基本结构和工作原理,用钛合金材料制备了某型热电池的壳体,在不同条件下进行了放电试验.研究了相同条件下采用钛合金壳体和传统不锈钢壳体的2种热电池在质量、寿命以及比能量等方面的差别.采用钛合金作为热电池的壳体材料可明显提高热电池的比能量和寿命,钛合金是弹栽热电池理想的壳体材料.     

Toughening of AT-Resins with a Polyphenylquinoxaline

Acetylene terminated (AT) resins are addition-curable thermoset materials which do not generate volatiles during cure and therefore can be fabricated into void-free structures. They retain good thermal and mechanical properties even after exposure to high humidity environments. Their use as composite matrix resins and adhesives has shown promise. These resins, however, are brittle. Molecular structure modifications and blending with thermoplastic modifiers have been used to improve their toughness. In this work, improvement in toughness has been sought through the use of a polyphenylquinoxaline (PPQ) modifier. The blended systems showed improvements in toughness, thermooxidative stability, and lap shear strength over the original AT-resins.     

Experimental Investigation of Epoxy Bonded Polymethylmethacrylate Joints

This paper presents an experimental investigation into various aspects of epoxy-bonded polymethylmethacrylate (PMMA) and PMMA-to-aluminium joints. The effects of adhesive thickness, overlap area, surface roughness, and environmental exposure on the joint strength were studied. Results indicated that the joint strength was not directly proportional to the overlap area, while sanding had a positive effect on the joint strength. A negative effect was observed when adhesive thickness was increased. The fatigue behaviour of adhesively-bonded joints under dynamic loading was found to be independent of frequency, for the range of values tested; however, it was dependent on the test temperature with greater reduction in fatigue life observed in PMMA-to-aluminium joints at higher temperature. Empirical equations from which the fatigue life of joints can be predicted were obtained by regression analysis. Intermittent fatigue testing of the joints was also performed. The epoxy adhesive tested proved to be a satisfactory choice for outdoor exposure. The rate of degradation of the adhesive was slow with the adherend itself degrading at a faster rate than the adhesive or the bondline.