大型双联链轮的数控加工

本文通过对大型双联链轮加工方法的分析,找到了一条加工大型双联链轮的途径,并且可以大大提高其加工效率与精度。     

φ30m辐射式刮泥机的改进

分析了φ30m辐射式刮泥机在使用维修过程中存在的一些缺点，介绍了相应的改进措施。     

淬火钢平面铣削工艺应用

介绍了对淬火钢平面铣削代替磨削的加工工艺。     

螺旋曲面用盘形铣刀廓形设计的向量矩阵法

螺旋曲面的加工和成形技术是单螺杆式石油水力机械中的一个重要研究课题。应用向量和矩阵理论，对工件螺旋曲面与刀具回转面的接触线上点的几何位置关系进行了分析，建立了公共点方程和正交方程，从而得到了一套简捷的设计圆柱螺旋曲面盘形铣刀廓形的新方法，并为其编制了专用的ＣＡＤ软件包。     

有色多金属矿选矿废水循环利用研究

采用废水回用工艺处理某铅锌矿选矿废水，其选矿指标先进、生产实施简单、系统运行稳定，废水回用率大于75％。对缺水地区同类型选矿厂有参考借鉴意义。     

投球调剖原理在注水井配水方面的应用

提出了一种油田注水井控制水量的新方法 ,它是通过投入注水井的调剖球选择性封堵炮眼达到控制全井水量的目的。该方法改变了通常的地面控水的方法 ,充分利用了注入水的势能 ,改善了吸水剖面 ,提高了有效注水率     

High-energy X-ray diffraction and topography investigation of CdZnTe

High-energy transmission x-ray diffraction techniques have been applied to investigate the crystal quality of CdZnTe (CZT). CdZnTe has shown excellent performance in hard x-ray and gamma detection; unfortunately, bulk nonuniformities still limit spectroscopic properties of CZT detectors. Collimated high-energy x-rays, produced by a superconducting wiggler at the National Synchrotron Light Source’s X17B1 beamline, allow for a nondestructive characterization of thick CZT samples (2–3 mm). In order to have complete information about the defect distribution and strains in the crystals, two series of experiments have been performed. First, a monochromatic 67 keV x-ray beam with the size of 300×300 μm² was used to measure the rocking curves of CZT crystals supplied by different material growers. A raster scan of a few square centimeter area allowed us to measure the full-width at half-maximum (FWHM) and shift in the peak position across the crystal. The rocking curve peak position and its FWHM can be correlated with local stoichiometry variations and other local defects. Typically, the FWHM values ranging from 8.3 arcsec to 14.7 arcsec were measured with the best crystal used in these measurements. Second, transmission white beam x-ray topography (WBXT) was performed by using a 22 mm×200 μm beam in the energy range of 50 keV to 200 keV. These types of measurements allowed for large area, high-resolution (50 μm) scans of the samples. Usually, this technique is used to visualize growth and process-induced defects, such as dislocations, twins, domains, inclusions, etc. the difference in contrast shows different parts of the crystal that could not be shown otherwise. In topography, good contrast is indicative of a high quality of the sample, while blurred gray shows the presence of defects. Correlation with other techniques (e.g., infrared (IR) mapping and gamma mapping) was also attempted. Our characterization techniques, which use highly penetrating x-rays, are valid for in-situ measurements, even after electrical contacts have been formed on the crystal in a working device. Thus, these studies may lead to understanding the effects of the defects on the device performance and ultimately to improving the quality of CZT material required for device fabrication. It is important to study crystals from different ingot positions (bottom, center, and top); consequently, more systematic studies involving scans from center to border are planned.     

Energy analysis of mechanical alloying of molybdenum disilicide in a new-type high energy vibrating ball mill

In order to understand the fundamentals of a high energy vibrating type milling process, the energy transfer during me-chanical alloying of molybdenum disilicide is investigated based on the Magini-lasonna energy transfer method, amended by Murty.The efficiency factor and total energy of milling are calculated. MoSi2 synthesized by a mechanically induced self-propagating .reaction has also been studied according to different milling parameters, such as the number of balls and the ball to powder weight ratio. The results indicate that the efficiency factor is between 1.944 and 8.507 J/(g·s). A total milling energy of about 19.38-26.47 kJ/g is found to be necessary for the mechanically induced self-propagating reaction of a Mo:2Si powder mixture. The efficiency of milling energy transfer is about 3.3%-4.5%. The experiment and modeling show that the optimum condition for mechanical alloy-ing is a half full vial of balls.     

细粒级掺杂石墨材料的制备及其出气特性的研究

通过球磨分散方法制备了细粒级掺杂石墨 ,采用SEM、EDX、TEM、XRD等手段分析了材料微观结构 ,并对其性能作了初步研究。研究表明 :当原始粉粒径小于 10 0nm时 ,材料具有高的热导率和优良的物理机械性能 (抗弯强度为 116MPa) ,与粗晶石墨材料相比 ,细晶石墨材料在电子束辐照前的出气性能与其基本相同。而辐照之后 ,细晶石墨材料释放的H2 、H2 O、CO ,特别是CO2 的量远远少于粗晶石墨材料释放的量     

行星磨粉碎氧化锆的工艺及应用

介绍了行星磨各工艺参数对不同工艺制备的氧化锆的粒度的影响。由此获得了质量稳定，粒度分布比较均匀的氧化锆超细粉；并对行星磨的应用作了简要概述。