钛板焊接工艺实践

工业纯钛在防腐设备上的应用越来越广泛，本文从4mm工业纯钛的钛板焊接实践出来，对焊接结构，气体保护和焊接工艺参数的选择进行了分析并提出了一些革新措施，有一定的借鉴意义。     

非晶、纳米晶铁基合金的实验研究

用X射线衍射分析仪(XRD), 透射电子显微镜(TEM), 扫描电子显微镜(SEM)和X射线吸收精细结构分析仪(EXAFS)对机械合金化后的FeNiPB(Cu, Nb)混合粉末进行了分析研究. 研究结果表明: FeNiPB(Cu, Nb)混合粉末球磨20h后合金化, 球磨80h后FeNiPB(Cu, Nb)混合粉末中的Fe, Ni原子处于非晶环境中, 粉末的形态为棉絮状, 电子衍射为典型的非晶环. XRD, EXAFS, TEM的分析结果表明在该条件下, FeNiPB(Cu, Nb)混合粉末完全转变成了非晶. FeNiPB(Cu, Nb)非晶合金在520℃加热1h后产生纳米晶, 所以纳米晶铁基合金可通过FeNiPB(Cu, Nb)非晶合金部分晶化获得.     

La部分取代MI混合稀土贮氢合金的电化学性能

金属La部分取代MI（混合稀土）的贮氢合金电极Ml0.8La0.2Ni4.0Mn0.4Co0.4Al0.1（A）容易活化，其充电效率、放电容量、快速放电能力以及荷电保持能力比电极MlNi4.0Mn0.4Co0.4Al0.1（B）分别提高5．5％、7．0％、4．0％和8．2％。电极A放电过电位比电极增大，且循环稳定性下降。     

螺旋支架治疗前列腺增生的适应症探讨

自1992年6月至1994年10月,收治了10例记忆金属螺旋支架管治疗前列腺增生所致排尿困难的患者.采用耻骨上经膀胱开放手术,取出金属螺旋支架管,摘出前列腺。分析了10例置管失败的原因。就金属螺旋支架管治疗前列腺增生的作用、适应症进行了探讨,认为合并膀胱颈部纤维化、前列腺中叶增生及以纤维组织增生为主的良性前列腺增生者不适宜这种治疗。     

Morphology evolution of two-phase Cu-Ag alloys under different conditions

Cu-Ag filamentary microcomposites with different Ag contents were prepared by cold drawing and intermediate heat treatments. The microstructure characterization and filamentary distribution were observed for two-phase alloys under different conditions. The effect of heavy drawing strain on the microstructure evolution of Cu-Ag alloys was investigated. The results show that the microstructure components consist of Cu dendrites, eutectic colonies and secondary Ag precipitates in the alloys containing 6%-24% （mass fraction） Ag. With the increase in Ag content, the eutectic colonies in the microstructure increase and gradually change into a continuous net-like distribution. The Cu dendrites, eutectic colonies and secondary Ag precipitates are elongated in an axial direction and developed into the composite filamentary structure during cold drawing deformation. The eutectic colonies tend to evolve into filamentary bundles. The filamentary diameters decrease with the increase in drawing strain degree for the two-phase alloys, in particular for the alloys with low Ag content. The reduction in filamentary diameters becomes slow once the drawing strain has exceeded a certain level.     

轴瓦的合理浇注及废品分析

详细介绍了轴瓦浇注的过程、废品产生的原因及有效防止缺陷的方法,从实践出发,对轴瓦的浇注工艺做了详细论述.     

Study on Moving Principle of Colonoscopic Robot

The moving principle of a colonoscopic robot is presented in this paper.The robot mainly consists of soft mobile mechanism for earthworm locomotion and turning mechanism based on shape memory effect.The soft mobile mechanism contacts colon wall with air-in inflatable balloons.so the robot has better soft and non-invasive properties.The turning mechanism can be actively bent by shape memory alloy components.It ensures the robot to adapt to the tortuous shape of colon.Therefore,the colonoscopic robot has good safety,lower working strength of surgeon and higher efficiency of colonooscopy.     

铁碳合金相图分析

铁碳合金相图是研究在平衡状态下铁碳合金成分、组织和性能之间的关系及其变化规律的重要工具,掌握铁碳相图对于制定钢铁材料的热加工工艺具有重要的指导意义.通过分析铁碳合金相图的主要特性点和主要特性线,解决了“金属工艺学“教学与研究中的重点和难点问题.     

Characterization of DC magnetron sputtering deposited thin films of TiN for SBN/MgO/TiN/Si structural waveguide

INTRODUCTION Monocrystalline SBN (Strontium barium nio-bium, SrxBa1?xNb2O6, denoted SBNx?100, where 0.25≤x≤0.75) solid solution, is currently being inves-tigated as potential material for many micro-device applications, such as piezoelectric infrared detectors, piezoelectric, electro-optic modulators, and holo-graphic storage (Koch et al., 1998), because SBN has one of the largest known linear electro-optic coeffi-cients (r33=1300 pm/V for SBN75), two orders of magnitude larger th…     

钛合金表面激光熔覆氧化锆陶瓷涂层的显微组织

本文采用激光熔覆技术,探讨制备ZrO_2/Ti梯度功能材料,利用SEM和EPMA分析激光熔覆层,过渡层、热影响区的组织形貌和各组元的成份分布。用X射线衍射和微区X射线衍射技术分析激光熔覆区的氧化锆相变及各区域的相组成。得到:经过激光熔覆处理,熔覆区氧化锆由C—ZrO_2和T—ZrO_2组成,激光熔覆层、过渡区,热影响区的组织分别为ZrO_2枝晶 Ti_2O、粒状Z_rO_2 α相、片状α组成,在过渡区内成份是渐变的,组织为陶瓷相ZrO_2和塑性相α相混合。此工艺是制备ZrO_2/Ti梯度功能材料有前途的方法。