200kA预焙槽强化电流过程中发生电解质粘度增加的实践探讨

通过分析200kA预焙槽在强化电流条件下电解质粘度增大的原因及对电解生产的影响,提出了规范电解生产作业制度及处理电解质粘度过大的建议,以实现降低工人劳动强度,达到工艺参数优化和提高电流效率的目的。     

等离子体熔融钛与羟基磷灰石混合粉颗粒的形态和相组成

利用等离子喷涂设备将Ti与羟基磷灰石（HA）的混合粉末喷射入水，采用扫描电子显微镜和X射线衍射仪研究了Ti HA入水颗粒的形态和相组成，结果表明，经等离子熔融喷射入水后，钛粒子的尺寸小于HA粒子，主要原因之一是HA内形成了空心结构，空心结构的形成是由于HA在熔融时生成气相P2O5和H2O，它们在颗粒内聚集形成气泡，入水Ti HA粒子主要是由晶相和非晶相HA，分角相磷酸三钙（TCP）和磷酸四钙（TTCP）以及Ti的化合物所组成，由于与Ti的混合，HA的分解加剧，而Ti与HA粒子的融合及元素的扩散在飞行过程中已经发生。     

Φ219mm中径焊管成型机组的研制

简要介绍了所研制的Φ２１９ｍｍ中径焊管成型机组的设备构成及技术性能等。     

厚壁变换炉的焊接

壁厚132mm的高温高压容器“二段变换炉”用国外材料制造，焊接过程采用手工电弧焊打底 埋弧自动焊的工艺方法，取得了较好的效果。     

锰对奥贝球铁组织和性能的影响

奥贝球铁在实现高硬度的同时具有较高的韧性，适合制造在一定冲击条件下的耐磨零件。通过对高硅条件下锰对奥贝球铁组织和性能的影响的研究，为该材料的应用提供了基础。     

Preparation and elements analysis of porous fluorescent glasses

A large variety of porous fluorescent glasses were prepared and the concentration of different elements in these glasses was analyzed. The start porous glasses were soaked in a solution containing soluble salts and then heated at 650 ℃ for 3 h to decompose the salts in the pores into oxides. Fluorescent agents, such as UO3, Eu203, were impregnated into the porous glasses to prepare the fluorescent glasses. The results show that soaking is a feasible method to prepare the glass sphere with compositions distinguishable from each other and easy to be located in a complicated background. Six or more components can be impregnated together into one glass sample and the concentration of them can be analyzed accurately. UO3 and Eu203 can be impregnated into porous glass to make the glass strongly fluorescent. Higher concentration of Eu203 produces stronger fluorescence while higher concentration of UO3 reduces the fluorescence intensity because of the concentration quenching effect.     

厚壁管类工件水淬传热问题的计算机模拟

根据钢制厚壁管类工件淬火的实际情况，建立了一个包含变物性、形状因素、过冷沸腾换热边界条件和相组成变化的热传导控制方程组。用有限元法求解厚壁管类工件水淬时瞬态温度分布和瞬态相组成分布。与实测相应厚壁管特性点的瞬态温度对比，计算结果令人满意。     

Graded plasma spraying of premixed metalceramic powders on metallic substrates

The mismatch between the thermal expansion coefficients of ceramics and metals and the differential stresses it causes at the interface create problems in metal to ceramic joining. Research has been con-ducted to solve this problem in thermal barrier coating technology. Previous studies have considered met-al-ceramic multilayers or graded-coatings, which include a metallic bond coat. In this study, a graded plasma-sprayed metal-ceramic coating is developed using the deposition of premixed metal and ceramic powders without the conventional metallic bond coat. Influences of thickness variations, number, and composition of the layers are investigated. Coatings are prepared by atmospheric plasma-spraying on In-conel 718 superalloy substrates. Ni-Cr-Al and ZrO₂ -8 % Y₂O₃ powders are used for plasma spraying. Ad-hesive and cohesive strength of the coatings are determined. The concentration profile of the elements is determined by x-ray energy-dispersive analysis. The microstructure and morphology of the coatings are investigated by optical and scanning electron microscopy (SEM). Results show that the mixed metal-ce-ramic coating obtained with the deposition of premixed powders is homogeneous. The morphology and microstructure of the coatings are considered satisfactory.     

Q-52-51型摩托车车轮轮毂开裂原因分析

检测和分析了Q-52-51型摩托车车轮轮毂从材料成分，力学性能和金相组织。结果表明，轮毂在径向冲击检测时开裂的主要原因是镁含量偏高，以及热处理加热温度高造成组织过热所致。     

Flame-Sprayed Glaze Coatings: Effects of Operating Parameters and Feedstock Characteristics Onto Coating Structures

Many substrates do not sustain the conventional glazing process (i.e., vitreous glazing) due to the relatively high temperature required by this treatment (i.e., up to 1400 °C in some cases) to fuse glazes after their application on the surface to be covered. Flame spraying could appear as a solution to circumvent this limitation and to avoid thermal decomposition of substrates. This contribution describes some structural attributes of glaze coatings manufactured by flame spraying. It also discusses the influence of the feedstock powder morphology and some of its physical properties on coating characteristics. This article is an invited paper selected from presentations at the 2007 International Thermal Spray Conference and has been expanded from the original presentation. It is simultaneously published in Global Coating Solutions, Proceedings of the 2007 International Thermal Spray Conference, Beijing, China, May 14-16, 2007, Basil R. Marple, Margaret M. Hyland, Yuk-Chiu Lau, Chang-Jiu Li, Rogerio S. Lima, and Ghislain Montavon, Ed., ASM International, Materials Park, OH, 2007.