Characterization and Growth Morphology of the Ultrafine Manganese Particles

In present work.the ultrafine manganese particles were prepared by gas evaporation method.Thestructure,size distribution,growth morphology and surface oxidation for the particles were investi-gated by using X-ray diffraction and electron microscopy.The results indicated that three types ofthe particles,with the structure of α-Mn,β-Mn and one unknown,respectively existed in the man-ganese particles.The growth morphology of the particles depended on the size and intrinsicstructure.When exposed to air,the particles were slightly oxidized only in the surface layer and sta-ble in air.     

第四系钙质胶结卵石成因及工程特性探讨

南水北调中线工程河南黄河北渠段沿线第四系松散层中分布有钙质胶结卵石。根据钻孔岩芯和开挖揭示情况,查清胶结卵石的分布特征,分析其成因主要为钙质淋漓、析出、胶结的结果。通过取样做饱和单轴抗压试验判别其软硬状态,结合施工开挖难易程度,综合考虑将其胶结程度分为三级,对其工程特性进行探讨。     

一种测量超微粒子表面氧化层厚度的新方法

通过XPS分析与Ar~ 刻蚀相结合的方法，测量了Fe_(50)Pd_(50)合金超微粒子（UFP）的表面氧化层厚度，发现它的表面氧化层为1．4um厚，小于电镜观察到的表面非晶层厚度，表明此方法测量的表面氧化层厚度不受表面吸附层的影响，并且能直接了解UFP表面的具体氧化状态。     

Synthesis and Characterization of Mixed Al+AlN Nanoparticles

Mixed Al+AlN nanoparticles were synthesized by an active plasma-metal reaction method. Mean particle size of the mixed Al+AlN nanoparticles is about 30-50 nm. Defects were found in some AlN particles. Moreover, the AlN ratio and its particle size in mixed Al+AIN nanoparticles obtained in different atmospheres (N2+Ar) increase with increasing N2 particle pressure, and the specific sudece areas of the mixed Al+AlN nanoparticles increase with the AlN ratio. The surface degradation of the Al+AlN exposed to air is estimated by the infrared absorption spectra     

聚苯胺与丙烯酸树脂相容性的研究及导电涂膜的制备

采用溶液聚合法制备了掺杂态聚苯胺的二甲苯溶液,并改变单体配比合成了一系列丙烯酸树脂。采用溶液共混法将聚苯胺溶液与丙烯酸树脂共混,制备了双组分导电涂膜。系统地研究了不同单体配比的丙烯酸树脂与聚苯胺的相容性,探讨了树脂中丙烯酸单体及苯乙烯单体含量对共混物成膜表面电阻和其他物理性能的影响。结果表明:丙烯酸树脂中丙烯酸单体含量为20%时,树脂与聚苯胺具有较好的相容性。苯乙烯含量为20%~30%时,共混物成膜性能良好。当聚苯胺含量在10%~25%之间时,得到的涂膜表面电阻为100~102.5kΩ,附着力均为0级,耐冲击性均为50 cm,硬度为2H~2B。     

PHOSPHORUS SEGREGATION AND ANNEALING TEXTURE IN A LOW CARBON STEEL SHEETS

The present work is to study the effect of phosphorus on the annealing texture of a low carbonsteel at different cold rolling and annealing condition by means of pole-figure,inverse-polefigure and orientation distribution function(ODF)method.The microstructure and distribu-tion of phosphorus in steel sheet are studied by means of metallography,scanning electron mi-croscope(SEM)and electron probe microanalysis(EPMA).The results show that phos-phorus promotes the formation of the fiber texture of〈011〉parallel to the rolling direc-tion and〈111〉normal to the sheet surface.The texture was found to be affected mainlyby preannealing temperatures,promoted at 390 or 590℃,and retarded at 490℃.At thepreannealing temperature promoting the formation of texture,phosphorus segregation to theinterior of grains was observed.It seems that the formation of the fiber texture may be associ-ated with the segregation of phosphorus.     

合金超微粒子粒径计算新方法

用X射线衍射(XRD),电子衍射(ED),透射电镜(TEM)和X射线电子能谱(EDAX)方法研究用惰性气体凝聚法制备的Fe_(50)Pd_(50)合金超微粒子(UFP)的X射线衍射峰宽化机制,结果表明其反常宽化是由于合金粒子间的成分不均匀引起的成分宽化量与衍射角θ和成分不均匀而引起的平均晶格常数变化率e_c有关,可表示为:川Gaussian,Cauchy和混合线形计算了平均粒径,Cauchy和混合线形得到的结果与电镜观测值符合较好当粒径较小时,由各种线形算出的结果比较相近,它们之间的差异随着粒径增大而增大,     

FePd合金超微粒子的制备与性能

研究了用惰性气体凝聚法制备FePd合金超微粒子(UFP),并测定其产物性能结果表明,母合金的成分及组元的活度系数对产物有重要的影响,只有蒸发N_(Fe)=0.5的合金,才能制得均匀的单相合金超微粒子,用XRD,TEM和DSC分析表明Fe_(50)Pd_(50)合金的UFP稳定性比Fe的UFP提高,其矫顽力较相同成分的粗粉提高几倍并可达4.30×10~4A/m以上     

活塞中凸变椭圆数控加工技术

介绍了中凸变椭圆活塞型面的数控加工系统及常用的几种实现方式,并对几种方式进行了比较,阐明了该项技术的发展方向。还述及了该项技术的控制软件的设计、数控系统硬件的设计以及机械机构设计的各个方面。     

使用RTK技术在沼泽物探测量中遇到的问题及解决办法

详细分析了使用RTK测量技术在沼泽地区进行物探测量中所遇到的一些实际问题,并提出了相应的解决办法。