场控变阻材料在高压陶瓷电容器边缘电场改善中的应用

利用场控变阻材料电阻率随电场变化的特点，改善留边型平板高压陶瓷电容器电极边缘的电场，可以大幅度提高陶瓷电容器的性能，探讨了ＰｂＯ－Ｂ２Ｏ３－ＳｉＯ２系玻璃加入掺杂ＺｎＯ制成的半导体玻璃釉对陶瓷电容器电击穿强度，充放电寿命的影响，通过配方，工艺、电极结构的优化可以使留边型高压陶瓷电容器的击穿强度提高８０％以上，充放电寿命提高了１０倍以上，并与具有类似场控变阻性能的半导体漆作了对比。     

FIBRE REINFORCED COMPOSITES BASED ON NOVEL BLEND MATRICES

A series of glass fibre reinforced composites based on novel blend matrices were fabricated us-ing reaction injection moulding (RIM) processing.The blends were made of sub-sequentialinterpenetrating polymer networks of acrylic-polyurea or acrylic-copoly(urea-isocyanurate).Themechanical and thermal properties were characterized by tensile test and dynamic mechanical ana-lysis.The fracture data from single edge notch bend tests were analysed using fracture mechanicsfor the composites to give K_(IC) and G_(IC).The correlation between reaction kinetics and morphologyof the blend and the composite properties were discussed.The investigations showed that the novelblends have good bonding property on glass fibre,thus good processability in RIM,and the re-suited composites have good mechanical and thermal properties.     

OPTO 22控制系统热备技术研究

为使OPTO 22控制系统实现控制器热备份,需要解决主控制器与备份控制器之间的连接组织、数据交换、故障识别和自动切换等一系列问题.根据实践提出解决方案,对OPTO22控制系统的热备过程应注意的几个问题提出了解决方法并进行了分析.     

<Emphasis Type="Italic">In situ</Emphasis> synthesis of TiC reinforced Cu<Subscript>47</Subscript>Ti<Subscript>34</Subscript>Zr<Subscript>11</Subscript>Ni<Subscript>8</Subscript> bulk metallic glass composites

In situ synthesized TiC particles and β-Ti dendrites reinforced Cu47Ti34Zr11Ni8 bulk metallic glass (BMG) composite ingots were prepared by the suction casting method.The ingots with diameters from 1 up to 4mm were successfully obtained. It was shown that introducing TiC micro-sized particles into the amorphous matrix did not disturb the glass forming ability (GFA) of the matrix,while the yield strength and ductility could be well improved.The phase constitution, microstructure and elements distribution in the composites were studied by OM, XRD, SEM and EDS.It was shown that the in situ synthesized TiC particles acting as heterogeneous nucleation sites promoted the precipitation of β-Ti dendrites, resulting in the formation of the TiC particles and β-Ti dendrites co-reinforced BMG composites. The compressive tests were employed to probe the yield strength and ductility of BMG composites.     

旧水泥混凝土路面沥青罩面层反射裂缝的防治

从旧水泥混凝土路面沥青罩面层反射裂缝的形成机理、防治措施入手,阐述了在施工时设置应力吸收层的必要性,并重点论述了玻纤格栅应力吸收层的特点及其在施工中的应用。     

磨碎玻璃纤维/聚氨酯/环氧灌封材料的形态结构与力学性能

采用真空灌注工艺,制备磨碎玻璃纤维(MG)／聚氨酯(PU)／环氧(EP)灌封材料,并对其力学性能和微观结构进行研究。研究结果表明:随着PU含量的增加,PU／EP共混聚合物的拉伸和冲击强度呈先升后降的变化趋势。当PU含量为15％时,共混聚合物的综合力学性能最佳,拉伸强度为60．57 MPa,冲击强度为23．56 kJ／m2,与EP相比分别提高32．77％和115％。为进一步提高材料的强度,并保持良好韧性,采用添加MG的方法来增强PU／EP。当MG与EP的质量比为1:1时,材料的拉伸强度达到79．72 MPa,与PLJ／EP相比提高31．95％,而冲击强度为17．83 kJ／m2,仍保持较高水平;同时,与相同含量的活性硅微粉相比增强PU／EP材料的拉伸强度和冲击强度分别提高18．91％和11．51％。     

碱激发对粉煤灰活性的影响

研究了粉煤灰的物理化学特性,设计了四种方案对粉煤灰进行改性,旨在扩大粉煤灰的应用. 通过对比改性前后Na2SiO3-粉煤灰试块的强度,使粉煤灰在改性前后的反应速度通过试块的强度得以体现. 扫描电镜照片显示,在机械粉磨结合化学激发处理后,坚硬的外壳大部分被破坏. 27Al的核磁共振图谱显示宽峰变窄. 29Si的核磁共振谱表明,Q0消失,Q2增多,Q4减少. 说明加入强碱并同时机械粉磨可有效破坏粉煤灰的玻璃微珠外壳及硅铝网络结构,可增强粉煤灰的潜在活性.     

剪切与吸附对弱凝胶深部调驱作用的影响

分别用玻璃微珠、石英砂、露头砂制作填砂模型，研究了弱凝胶体系的动态性能变化以及剪切与吸附对其深部调驱作用的影响。研究结果表明，动态条件下弱凝胶体系在3种介质中均可发生交联反应，其封堵能力、有效作用距离、深部调驱作用在玻璃模型、石英模型、露头模型中依次降低，水驱后弱凝胶均呈颗粒状。剪切作用可破坏弱凝胶三维结构及聚合物分子链，延长动态成胶时间，降低弱凝胶的封堵强度及其深部调驱作用；吸附作用可富集交联剂，加快交联速度，缩短动态成胶时间，降低弱凝胶本身强度、可运移性及其深部调驱作用。     

超音速气固两相分离试验研究

建立了超音速气固两相分离装置试验系统,在室温和不同喷管进口全压下,对空心玻璃珠颗粒的分离效率进行了试验研究.试验结果表明:当喷管进口全压在482~537 kPa范围时,超音速气固两相分离试验装置对Sauter平均直径9.84μm颗粒的总分离效率为57.83%~67.28%,对直径大于8.31μm颗粒的分离效率为75.73%~80.52%,对直径在15μm以上颗粒的分离效率为96%~100%,表明颗粒直径越大,分离效率越高.由此可见,超音速气固两相分离方法是可行的.试验研究为超音速气固两相分离技术的进一步深入研究和应用提供了有用的参考.