SPS原位反应快速制备WC-6Co硬质合金的研究

应用放电等离子烧结（SPS）技术，利用WO3、Co3O4和C粉的混合粉末原位还原、化合反应快速制备WC6Co硬质合金。分析了烧结温度与压力对合金致密度、显微组织和性能的影响．结果表明：应用SPS技术，利用原位反应合成的短流程工艺路线，在烧结温度与压力分别为1270℃和90MIa的条件下能够快速制备出相对密度达99％、洛氏硬度（HRA）≥93、维氏硬度（HV）≥1900且成相良好、显微组织均匀的WC-Co硬质合金。     

单车车载式60Co集装箱检测系统辐射源装置

文章涉及单车车载式60Co集装箱检测系统辐射源装置的结构设计方案和工作原理。该辐射源装置样机的试验运行结果表明:辐射源装置的工作和运输状态可靠安全、操作方便,满足了单车车载式60Co集装箱检测系统要求。     

La0.6Sr0.4Co1-yFeyO3的混合导电性研究

采用直流四探针法和两端子电子阻塞电极交流阻抗谱研究了GNP法制备La0．6Sr0．4Co1-yFeyO3陶瓷的电子-离子混合导电性能．在室温-900℃范围内，La0．6Sr0．4CoO3的电子电导率随温度的升高而单调降低，其它样品的电子电导率随温度的升高在600℃附近达到最大值．La0．6Sr0．4Co1-yFeyO3陶瓷的氧离子电导率随温度的升高而增加．在相同温度下，随着Co／Fe比例的增加，La0．6Sr0．4Co1-yFeyO3陶瓷的电子电导率和氧离子电导率增加，电子导电活化能和离子导电活化能降低．氧离子迁移数随温度的升高而增加，随Co／Fe比例的增加而降低．     

Preparation and characterization of Ni/Co bimetallic nano-clusters

Ni/Co bimetallic nano-cluters have been prepared from the aqueous solution by reducing their corresponding metal salts under suitable conditions. The experimental conditions including the type and concentration of protective agent, feeding order and the pH of the solution that influence the average particle size have been studied in detail. Transmission electron microscopy (TEM) indicates that the shape of those bimetallic nano-cluster particles is spheroid. The alloy structure has been shown by X-ray powder diffraction (XRD). The X-ray photoelectron spectroscopic (XPS) data have confirmed that the nickel and cobalt in the bimetallic nano-clusters are in the zero-valence state.     

Ni与Cu及Co同时分光光度测定

将多元线性回归分析，用于多组分有色金属离子ＥＤＴＡ络合物的同时光度测定，讨论了方法原理、实验条件，建立了回归方程和线性方程组．对１０个自配样和矿样进行了测定，获得满意结果     

重稀土锰基化合物Gd（Mn,Co）Si的结构与磁性

通过金属钴对锰的替代，考察了Ｇｄ（ＭｎＣｏ）Ｓｉ化合物的晶体结构，居里温度ＴＣ和磁化率随替代量变化的规律，初步探讨了重稀土Ｇｄ原子同过渡金属Ｃｏ，Ｍｎ原子之间以及过渡金属原子与过渡金属原子之间的磁相互作用。     

阿塞勒公司汽车钢板主要品种综述及我国汽车板生产研发现状

系统介绍了粗钢产量位居世界第一的阿塞勒集团公司汽车板的品种,主要包括三大类十一个品种系列.同时对我国汽车板需求和生产研发现状进行了概述.     

高能球磨制备纳米WC-8Co复合粉末

对采用高能球磨法制备纳米WC-8Co复合粉末的工艺条件进行了研究。实验采用逐步优化方式,研究液固比、球料比、球磨转速、球磨时间对粉末的特性的影响。采用SEM扫描电镜观察粉末形貌,用EDX能谱分析了粉末中Co元素的分布,检测了粉末中Co的化学成分,确定了液固比参数,通过检测粉末的比表面和BET粒度的变化优化球料比、球磨转速及球磨时间等工艺参数,采用最优化工艺得到了粉末比表面为6.82m2/g、BET粒度为59.4nm,Co相分布均匀的纳米WC-8Co复合粉末。     

Microstructure of Nanostructured WC-Co Coating Prepared by Thermal Spraying

Nanostructured WC-Co coatings were produced with Atmospheric Plasma Spraying (APS) and Low Pressure Plasma Spraying (LPPS). Microstructure characteristics and phase compositions of the coatings were studied by means of scanning electron microscopy (SEM) and X-ray diffraction (XRD) respectively. The microstructure compositions were analyzed with EDS. During APS deposition the existence of oxygen causes the decarburization of the coating, and the coating was composed of melted area and the WC/12Co powder. Besides WC phase, there was W2C phase. However in the coating deposited by LPPS the content of oxygen was so low that there were a limit degradation of the WC/12Co powder. The coatings were made up of compact block and loosen porosity area. There were large quantities of nanostructure WC grains and a small quantity of microstructure WC grains presented in the coating. Besides WC phase, a little W2C and WC1-x or Co6W6C phases occured. Consideration of the characteristics of the highly porous, spherical-shell morphology of nano-WC/12Co power, heterogeneous melting and localized superheating of the power were two main factors which caused the microstructure and phase composition of nano-WC-Co coatings.     

纳米晶WC-10Co复合粉末烧结行为的研究

本文研究了机械合金化制备的纳米晶WC 10Co复合粉末的真空烧结特征 ,分析了孔隙度、显微硬度随绕结时间延长和烧结温度升高的变化规律 ,考察了一种新型抑制剂的作用。结果表明 :在 132 5℃ / 15min的烧结条件下 ,样品的相对密度达到了 98%以上 ;烧结样品的显微硬度随着烧结时间的延长和烧结温度的升高先增加后降低 ,并且在 132 5℃ / 15min的条件下其硬度为 2 2 95MPa ;新型抑制剂A既有利于晶粒长大的控制 ,同时又有利于材料致密化的进行 ,显著地提高了合金的性能。