镁基复合材料微区力学状态的有限元分析

弹性变形范围内,在采用三维有限元模型分析了颗粒增强Mg基复合材料(PRMMCs)中,颗粒的分布形态对材料微区力学状态的影响。结果表明,在保持颗粒长径比(2:1)和颗粒间距(d)不变的情况下,随着θ的变化,不存在颗粒断裂的危险,材料的主要失效方式为界面脱离和基体开裂。增强体相对夹角θ=15o时的结果优于其它情况,这更有利于充分发挥材料的性能。     

粉末冶金法制备SiC晶须增强MB15镁基复合材料

采用粉末冶金法制备了SiC晶须增强镁基复合材料(SiCW／MB15)试样。通过检测基体显微硬度探讨了SiCW对镁合金时效规律的影响，并借助扫描电镜(SEM)、透射电镜(TEM)和拉伸试验，研究了混粉方式对复合材料室温力学性能、SiCW分布及显微结构的影响。结果表明，MB15及其复合材料的时效硬化曲线上均存在双峰现象；SiCW的加入既提高了MB5的硬度，又加快了其时效速度：混粉方式对晶须分布及SiCW／MB15复合材料的室温力学性能影响很大。     

Al-18%Si合金在梯度强磁场中凝固时初生硅的行为

研究了Al-18%Si合金在10 T梯度强磁场下加热至半固态和全熔态后的凝固过程,观察了初生硅的分布和形态,测定了其冷却曲线.结果表明:在磁场的磁感应强度和磁场梯度的乘积Bz·dBz/dz为正时,初生硅向上部聚集;而在Bz·dBz/dz为负时,初生硅向下部聚集;在强磁场下,加热至全熔态冷却下来的凝固组织中初晶硅的形态发生了明显的改变,由板片状转变为块状,初晶硅显著细化.对强磁场细化初晶硅的机制进行了探讨.     

The Structure Stability of Carbide-Free Bainite Wheel Steel

Metallographic structures of carbide-free bainite steel wheel rim are mainly composed of supersaturated lath ferrite and retained austenite film among bainitic ferrite laths. It is suspected that supersaturated ferrite and retained austenite are likely to decompose under the influence of temperature change and mechanical stress. Stability of wheel rim structure is studied by means of x-ray diffraction, dye microscopy, and micro-hardness test. When the samples are tempered in the range of 150-350 °C, the retained austenite films are at the state of relative stability. Fifty percent of retained austenite is decomposed when the sample is tempered at 400 °C. Microhardness increases when the sample is tempered at 150 °C. The decrease in hardness is mild when the samples are tempered from 200 to 500 °C. The mechanical stability of retained austenite film is studied with tensile sample under the effect of tensile stress. The retained austenite appears to be stable in low and middle degree of deformation, and decomposition occurs at great amount of deformation. Diffraction peak of carbide is not found in all above experiments. The steel enriched silicon prevents the carbide precipitation during the transformation. It indicates the carbide-free bainite wheel steels have an excellent thermal and mechanical stability.     

一种有效的橡胶助剂

介绍了一种能有效地吸收胶料中水分的橡胶助剂Rhenogran CaO-80，它既能很好地分散于胶料之中，防止硫化时气泡的生成，还能提高交联速度和产品合格率，是一种经济型的多功能橡胶添加剂。     

白油加氢装置技术改造

对抚顺石油化工分公司石化三厂白油加氢装置进行技术改造，通过调整加氢工艺，采用一段加氢工艺生产高品级的加氢尾油，再经分馏系统生产出多种优级品的白油，满足了市场需求，并创造了可观的经济效益和社会效益。     

甲基化-β-环糊精的制备及其对甲基对硫磷和呋喃丹的增溶作用

研究了甲基化 β 环糊精(MCD)的一种简单制备方法及其对甲基对硫磷和呋喃丹的增溶作用。实验结果表明:MCD水溶液对甲基对硫磷和呋喃丹有明显增溶效果,在20g/L的MCD溶液中,甲基对硫磷和呋喃丹的溶解度比在纯水中分别提高了21 91和4 01倍,增溶作用的大小与MCD的浓度呈线性相关,而且和农药的疏水性及分子几何形状与环糊精空腔的匹配程度有关。     

超稠油污水处理技术的研究

以河油田曙I区社84污水处理站含超稠油污水为对象，选用最新研制开发的HL－005高效除油剂，研究了药剂浓度及复合比例对污水的处理效果。结果表明，在现有工艺条件下，使用该药A与C两组分复合先对污水进行预处理,然后A与B两组分复合对预处理后的水质进行净化，在技术上是可行的，完全达到水质净化指标。     

Spinose carbon nanotubes grown on graphitized DLC film by low frequency r.f. plasma-enhanced chemical vapor deposition

Spinose carbon nanotubes (SCNTs) are grown on silicon substrates covered with diamond-like carbon film and iron catalyst film (Fe/DLC/Si structure) by low frequency r.f. plasma-enhanced chemical vapor deposition (LFRF-PECVD). During the pre-treatment of the Fe/DLC/Si substrate, there are three processes happened, namely, iron film spalled to small islands, the DLC film graphitized, and the iron island reacted partially with the graphitized DLC (GDLC), which can be deduced from the Raman spectroscopy and SEM pictures. SCNTs film grew from C₂H₂---H₂ mixture under low plasma density. The good contact of carbon nanotube with GDLC film was acquired by the accumulation of the graphite sheets and the reaction between the iron particles and GDLC film. The homogeneous spines with the length of approximately 15 nm and the thickness of <5 nm burgeoned from the defects at the wall of carbon nanotube and distributed uniformly, which were in fact thin bent or rolled-up graphite sheets.     

Evaluation of four steering wheels to determine driver hand placement in a static environment

While much research exists on occupant packaging both proprietary and in the literature, more detailed research regarding user preferences for subjective ratings of steering wheel designs is sparse in published literature. This study aimed to explore the driver interactions with production steering wheels in four vehicles by using anthropometric data, driver hand placement, and driver grip design preferences for Generation-Y and Baby Boomers. In this study, participants selected their preferred grip diameter, responded to a series of questions about the steering wheel grip as they sat in four vehicles, and rank ordered their preferred grip design. Thirty-two male participants (16 Baby Boomers between ages 47 and 65 and 16 Generation-Y between ages 18 and 29) participated in the study. Drivers demonstrated different gripping behavior between vehicles and between groups. Recommendations for future work in steering wheel grip design and naturalistic driver hand positioning are discussed.