铝基结合剂金刚石磨轮的制备

采用铝基材料为结合剂制备了金刚石磨轮，并从制备工艺、使用寿命、修整效果三方面对该铝基结合剂金刚石磨轮进行了论述。该磨轮烧结温度低（300℃左右），使用寿命是树脂结合剂金刚石修边轮的3倍以上，修整的陶瓷砖四边光滑、平整。     

线路分散补偿电容器损坏原因简析及其改进措施

简述了影响电容器使用寿命的因素;分析了油田线路分散补偿电容器寿命缩短的原因,并提出了相应的改进措施。     

SiCw/Al复合材料切削表面层中SiC-Al界面观察(英文)

The SiC-Al interface in the cutting surface layer of the squeeze casting SiCw/Al composite was observed by transaction electron microscope (TEM). The results showed that there was a high density dislocation in the aluminium matrix, and the SiC-Al interfaces were not destroied during the cutting processes. It has been proved that the squeeze casting SiCw/Al composites have high interface bonding strength, so it is necessary to study the interface bonding mechanism of the SiCw/Al composite. TEM observation results showed that at the SiC-Al interface in the squeeze casting SiCw/Al composite, no new phases were observed, and no long distance (more than 50nm) mutual diffusion of Si and Al was found. Further analysis     

Cu含量对Al2O3·SiO2sf/Al-Cu复合材料耐磨性能的影响

通过挤压铸造的方法制备出了不同Cu含量的系列Al2O3·SiO2sf/Al-Cu复合材料.摩擦磨损实验结果表明,Cu的加入降低了复合材料的摩擦系数;且随着Cu含量的增加,Al2O3·SiO2sf/Al-Cu复合材料的耐磨性能先增加后降低.在磨损过程中,Al2O3·SiO2纤维增强相牢固地镶嵌在基体里并形成支架,起到保护基体而提高复合材料耐磨性能的作用.Al2O3·SiO2sf/Al复合材料的磨损机制主要为黏着磨损,Al2O3·SiO2afAl-Cu复合材料的磨损机制为黏着磨损为主并伴有磨粒磨损.     

碳化硅晶须增强铝复合材料的精密切削研究

对挤压铸造法制造的碳化硅晶须增强铝复合材料(SiCw/Al)进行的精密切削研究结果发现;一方面这种复合材料对刀具磨损较为严重;另一方面复合材料切削表面质量主要取决于进给速度,随进给速度提高,复合材料表面质量下降。研究还发现由于复合材料切削过程中特殊的金属去除机制,使复合材料切削表面均产生残余压应力。     

晶须含量对SiC_W／AI复合材料性能影响规律的研究

采用挤压铸造法制备了不同晶须含量的ＳｉＣ＿Ｗ／Ａｌ复合材料，并测试和分析了铝合金和不同晶须含量ＳｉＣ＿Ｗ／Ａｌ复合材料的力学和物理性能。结果表明，随晶须含量的增加，ＳｉＣ＿Ｗ／Ａｌ复合材料的抗拉强度和弹性模量明显提高，并且比强度和比刚度也有所提高；热膨胀系数和热传导率随晶须含量提高而降低，并且热传导率与热膨胀系数比值也略有降低。     

Effect of aging treatment on mechanical properties of （SiCw＋SiCp）/2024Al hybrid nanocomposites

1 Introduction Metal matrix composites(MMCs) have received much attention because of their improved specific strength, good wear resistance and higher thermal conductivity [1?3]. Up to now, most investigators have studied the fabrication process and mecha…     

Effect of pressure on the solidification behavior and mechanical properties of SiCp/Al-Mg composites

SiCp/Al-Mg metal matrix composites were manufactured by semi-solid stirring technique. The composites were remelted and then solidified under different pressures to study the solidification behavior of composites by differential thermal analysis, scanning electron microscopy, and transmission electron microscopy. The experimental results show that SiCp reinforcements can not act as heterogeneous nucleation sites for α(Al), and an interfacial layer composed of MgAl2O4 spinel and Si-rich phase existed at Al/SiCp interface. The undercooling of the matrix alloy was improved by the pressure applied, resulting in the grain of matrix alloy refining. The X-ray diffraction pattern of composites testified that the matrix alloy exhibited a certain preferred orientation during solidification. In addition, with increasing the pressure for solidification, the pored defects in the composites decreased, while the relative density, hardness and compressive strength increased. Therefore, the microstructure and mechanical properties of the composites were improved by pressure placed during the solidification of SiCp/Al-Mg composites.     

Zn-PANi二次电池循环寿命影响因素

为研究Zn-聚苯胺二次电池的循环寿命影响因素,通过电化学方法,研究正极材料过充降解、负极钝化、枝晶形成、集流体腐蚀和电解液干涸5个因素对Zn-PANi电池循环寿命的影响．测试结果表明:负极形成枝晶引起电池短路是主要影响因素,使电池只有70个循环的寿命．其次,电池过充、正极材料降解导致电池的自放电,直接降低电池的循环寿命．此外,电解液干涸、负极钝化和集流体的选择均对电池的循环寿命产生不同程度的影响．     

双通道接收的无扫描激光成像技术

比较了几种无扫描激光三维成像技术的优缺点,提出一种基于双通道接收的强度调制型无扫描激光三维成像技术,该技术具有成像速度快、精度高、可靠性好、距离远的特点。采用大功率脉冲激光器作为激光照射源,两路ICCD同时接收,双通道分光系统将接收回波分到两路ICCD,通过两路ICCD强度信息反演出目标各点距离信息。重点介绍了该项技术工作原理和实现方法,研制了原理样机,进行了成像实验,对成像结果进行了分析,实现了作用距离5.1 km、作用距离30 m时距离分辨率0.25 m的技术指标。