制作微器件的超声电解复合微细加工基础研究

提出一种制造MEMS微器件的新技术——超声电解复合微细加工；设计微细加工工艺系统，进行一系列微细加工基础工艺试验，验证超声电解复合微细加工在微器件制造中的可行性．展示了该技术在提高微细加工精度、效率、表面质量等方面的优势，研究成果对完善MEMS器件制作技术具有重要理论意义与实用价值。     

Technique of pulse electrochemical finishing in molds and dies

Surface finishing is one of the most important processes in mould and die making. This process is necessary not only for smoothing the surface of die or mould, but also for removing the surface layer, which has been damaged by the preceding machining process and finally improve the performances and lifetime of moulds to a large extent. It has been reported that between 30% and 40% of the total time required to manufacture a die or mold is spent on finishing operations, most of which are performed by skilled workers employing traditional techniques. At present, key problems in mould and die finishing technology can improve the finishing efficiency, consistency and quality at reduced costs. A new and high efficiency unconventional finishing technology, pulse electrochemical finishing was introduced. Experiments were done in neutral nitrate electrolytes. The influence of electrolyte composition, intereletrode gap, finishing time, flow quality, current density, compositions of steel materials and pulse parameters on the resulting surface finishing was investigated. Results indicate that pulse parameters have important influence on operations finishing and the proper selection of pulse parameters can lead to both good smoothing efficiency and surface quality at low costs.     

铜-不锈钢复合材料在HSO3-和/或Cl-介质中的腐蚀行为

采用选择腐蚀技术，提取了铜一不锈钢复合材料中的纤维相，并测定了纤维相电极电位。通过循环加速腐蚀试验和电化学测试方法，研究了3种铜一不锈钢复合材料和纯铜在HSO^3-和／或Cl^-介质中的腐蚀行为。同时研究了腐蚀对材料的力学性能、导电性能和显微组织的影响。结果表明，Cu-10wt％SS原位(微观)复合材料在HSO3^-和／或Cl-介质中具有一定的耐蚀性。HSO3^-对铜-不锈钢复合材料腐蚀的影响显著。     

Low-melting-point titanium-base brazing alloys—part 1: Characteristics of two-, three-, and four-component filler metals

The melting point, microstructure, phase, and electrochemical behavior of Ti-21Ni-15Cu alloy, together with two-, three-, and four-component low-melting-point titanium-base brazing alloys, are presented in this paper. Five filler metals were selected for the study, in which melting points were measured by differential thermal analysis, phases identified by x-ray diffractometry, and corrosion behaviors tested by potentiodynamic polarization. The experimental results show that the three-component Ti-15Cu-15Ni and the newly developed Ti-21Ni-14Cu alloys exhibit the combination of lower melting point and superior corrosion resistance compared to the two-and four-component titanium alloys, 316L stainless steel, and a Co-Cr-Mo alloy in Hank’s solution at 37 °C. On a short time basis, the presence of Ti₂Ni and Ti₂Cu intermetallics in the Ti-15Cu-15Ni and Ti-21Ni-14Cu alloys should not be preferentially dissolved in galvanic corrosion with respect to the dissimilar Ti-6Al-4V alloy.     

La0．67Mg0．33Ni2．5Co0．5贮氢合金的制备和MH电极性能研究

采用高频感应熔炼方法制备了PuNi3型La0.67Mg0.33Ni2.5Co0.5合金;用X射线衍射分析和电化学方法研究了添加不同Mg含量以补偿Mg元素烧损时合金的组织结构和电化学性能。X射线衍射分析(XRD)表明,铸态合金由．PuNi3型主相和少量的CaCu5型第二相组成,铸态合金经1223K和10h退火处理后,CaCu5型第二相可明显减少,其中Mg增加10％时得到纯度较高的PuNi3型组织。电化学测试表明,增加适当Mg含量和进行退火热处理能明显提高和改善合金电极容量、循环稳定性和大电流放电性能。与AB5型和。482型Laves相贮氢合金比较,PuNi3型La0.67Mg0.33Ni2.5Co0.5贮氢合金具有电极容量高及优良的大电流放电性能。     

HSn70-1B铜管在碱性NaCl溶液中的腐蚀行为

利用表面分析技术和电化学方法研究了HSn70- 1B 铜管在碱性NaCl溶液中的腐蚀行为.在自腐蚀状态下，HSn70-1B铜管表面生成以Cu2 O为主的表面膜；在阳极极化电位下表面CuCl的生成反应为一级反应，电极表面形成CuCl膜 后，存在极限电流密度；电化学阻抗频谱(EIS)有2个容抗弧，随Cl-含量的增加，容抗弧 逐渐收缩，弥散性增大.     

Influence of addition of Cu（OH）2 to KOH alkaline electrolyte on electrochemical properties of La2Mg0.9Al0.1Ni7.5Co1.5 hydrogen storage alloy electrode

The influence of the addition of Cu（OH）2 to 6 mol/L KOH alkaline electrolyte on the electrochemical properties of La2Mg0.9Al0.1Ni7.5Co1.5 hydrogen storage alloy electrode was investigated by electron probe X-ray microanalysis（EPMA）, X-ray diffraction（XRD） and electrochemical measurements. EPMA micrographs and XRD patterns show that the surface of the hydride electrode is plated by metal copper film. The thickness and compactness of Cu film increase with the increment of charge-discharge cycle number. The copper film of the hydride electrode surface can keep the hydrogen storage alloy particle in the electrode interior from oxidizing availably. The addition of Cu（OH）2 to alkaline electrolyte lowers the activation property and the high rate dischargeability of the La2Mg0.9Al0.1Ni7.5Co1.5 hydride electrode, but has no negative effect on the maximum discharge capacity of the hydride electrode. Moreover, it is effective to improve the cyclic stability of the hydride electrode utilizing electrodeposit Cu film on theLa2Mg0.9Al0.1Ni7.5Co1.5 hydride electrodes surface.     

一种便携式室内空气质量快速检测仪设计

设计一种涉及室内甲醛（ HCHO）、氨（ NH3）和苯（ C6 H6）三种有害气体浓度的便携式快速检测仪。该仪器采用新型电化学传感器与基于FPGA的新型高精度信号处理电路得到对应气体的初始浓度值,并结合室内环境气压和温湿度实时监测情况,修正初始浓度值,对浓度超标气体进行声光报警。该仪器具有检测速度快、精度高和携带方便等优点,为大众家庭实时快速检测室内空气质量提供一种简单可靠的方法与手段。     

p53抑癌基因电化学阻抗传感器研究

基于电化学阻抗技术构建了一种检测p53抑癌基因的电化学传感器.首先利用自组装作用将末端带巯基的探针p53抑癌基因(p53-DNA)固定于金电极表面,根据传感器结合前后电子转移阻抗值的变化,对目标p53-DNA进行了测定.以pH =7.4的5mmol/L K3[Fe(CN)6]-5mmol/L K4[Fe(CN)6]平衡电对溶液作为检测液,检测目标p53-DNA的线性浓度范围为1.0×10-8～ 1.0×10-6 mol/L,其检出限为3.0×10-9 mol/L(S/N =3).对5.0×10-8 mol/L的目标p53-DNA进行11次平行测定,其RSD为3.4％.该传感器制作简单、灵敏高、选择性好,且无需标记,易于操作.     

模拟酸雨环境下再生混凝土的电化学测试与分析

利用硫酸溶液模拟人工酸雨环境,对其对再生混凝土性能的影响进行了测试和总结。试验过程中,电化学工作站测试出自腐蚀电位负值变大,混凝土保护层的电阻值变小,钢筋的腐蚀速率明显增大。试验所得数据及结论为进一步研究酸雨对再生混凝土性能影响问题提供基础和依据,为再生骨料混凝土的扩大应用和耐久性设计提供参考。