Reinforced Powder Chromium Steels and Their Use for the Hardening of Feed Mill Hammers

Powder Metallurgy and Metal Ceramics - The abrasive wear of reinforced Kh13M2–Cr3C2 steels against a diamond wheel has been studied. The optimum composition of the reinforced chromium steels...     

振动磨连续粉磨工艺

对物料在筒体内滞留时间和数量进行了试验研究,同时探讨了工作条件对产品粒度和处理量的影响.     

振动磨产品粒度和粉磨动力学研究

以冶金耐火材料电熔镁砂为研究对象,采用正交试验法,对振动磨的产品粒度分布规律和粉磨动力学进行深入系统的研究。通过回归经验公式,揭示了振动磨机粉磨效果与各主要影响因素之间的关系。     

热带轧机计算机控制系统中的模拟轧钢

从硬件和软件两个方面介绍了模拟轧钢的具体使用方法和实现的手段。详细地给出了轧线上各处检测器状态时序的计算方法、模拟方案数据的确定,最后还给出了模拟调节程序的模拟运行方法。     

粉煤制备系统与立式磨煤机

磨煤机是粉煤制备系统中的核心设备,其作用是将具有一定尺寸的块煤干燥、破碎并磨制成粉煤,常用的有卧式球磨机和立式磨煤机两种。本文介绍了粉煤制备系统的工艺流程,对两种磨煤机进行了对比,详细描述了立式磨煤机的结构特点、工作原理以及在白银有色集团股份有限公司铜业公司生产中的应用情况。     

Mo-Cu混合粉末机械合金化及固溶度热力学研究

采用机械合金化方法对不同组分的Mo、Cu混合粉末进行加工,球磨时间达到50h。通过扫描电镜及X射线衍射等对复合粉末的形貌、X射线衍射特征进行了分析,并对Cu在Mo中的固溶度进行了研究。结果表明:采用高能球磨机械合金化方法可以制备出平均晶粒尺寸在50 nm左右的Mo-Cu复合粉末,且粉末均匀化程度很高;从热力学平衡角度出发,通过细化晶粒来提高Cu在Mo中的固溶度极限可以用数学模型来表达。     

转鼓型氧化铅粉的生产工艺

本文对转鼓型氧化铅粉机生产过程中各参数的相互关系及对氧化铅粉质量的影响进行了探讨,并寻找出一种稳定生产的工艺条件。     

Efficient Synthesis and Characterization of Nanostructured TiC Powder by Reaction Milling

Nanocrystalline TiC powder is synthesized from corresponding elemental constituents by reaction milling in a dual drive planetary mill. The study shows nanocrystalline TiC powder could be produced from Ti + graphite and Ti + activated carbon powder after 10 h of milling. Raman spectroscopy provides evidence in support of formation of TiC after 10 h of milling. Scanning electron microscopy reveals the size reduction and morphology of particles at different stages of milling. Transmission electron microscopy shows the formation of nanocrystalline TiC powder with particle size in the range of 50–200 nm. The lattice parameter of TiC (fcc) has been precisely calculated from first two strong peaks as 0.42 nm.     

Powder Metallurgy Reconditioning of Food and Processing Equipment Components

A powder metallurgy method is developed to recondition the worn surfaces of food and processing equipment components. A combined additive is composed to minimize the powder losses in sintering. A technique is constructed to determine the powder consumption as a function of the required metallic coating thickness. A rapid method is developed to determine the porosity of the coating. The proposed technology is used to fabricate a wear-resistant defectless metallic coating with favorable residual stresses, and the adhesive strength of this coating is equal to the strength of the base metal.     

成型球磨粉的稳定控制技术研究

通过实施球磨系统磨内工况优化、高效转子分级机的应用以及开路循环控制系统的应用等措施,使球磨粉纯度达到稳定可调,球磨粉产量显著提高,满足了成型生产要求。     

球磨时间对硫化铜矿粉末性能的影响

简要介绍了高能球磨系统装置,高能球磨机理和实验分析手段.本实验主要研究了搅拌球磨过程中球磨时间的变化对硫化铜矿粉末的粒度、结构以及显微形貌等性能的影响.     

高能球磨法制备吸气材料用超细锆粉

采用高能球磨的方法制备出超细锆粉，并采用XRD，TEM，动态光散射粒度测试仪等多种测试手段研究了粉末的组成，形貌和粒度分布，结果表明，经20h高能球磨后粉末晶粒达到纳米级，粉末颗粒形状不规则，在球磨过程中有少量铁杂质带入，对试验结果进行了进一步的分析和讨论。     

高炉喷煤制粉系统冬季生产存在的困难及措施

包钢4#、6#高炉喷煤系统主要采用2台HP1103型中速磨煤机,文章论述了包钢4#、6#高炉喷吹原煤贮运系统冬季生产存在问题及困难,分析了设备隐患对高炉喷煤量的影响,并采取了相应措施.     

制粉工艺对铝基聚苯酯封严涂层材料粉末及涂层性能影响研究

本文以铝基合金粉末和聚苯酯为原材料,通过固相混合、喷雾造粒、胶粘团聚三种制粉方法制备了铝基聚苯酯复合粉末,通过等离子喷涂方法制备了封严涂层,并对粉末及涂层性能进行了对比研究。实验结果表明,胶粘团聚型粉末粒度、松装密度、流动性等性能配合良好,喷涂后涂层可磨耗组分存留完整,硬度、结合强度的匹配性最好。     

Combustion of Powder Mixtures Forming Reaction Products - Synthesis of NiAl

Abstract

Combustion of powder mixtures under adiabatic conditions -Self-propagating High-temperature Synthesis (SHS)-is an efficient and attractive technique to synthesize a host of materials for high technology applications, namely, ceramics, intermetallics, composites and functionally graded materials. Conditions necessary for and general features of this technique are briefly reviewed.

Experimental investigations on synthesis of nickel monoaluminide from stoichiometric mixtures of component powders by this technique using plane-wave propagation mode is carried out. Effects of reaction parameters namely, bulk density of compacts, amount of inert dilutions and atmospheres on velocity of combustion wave propagation and combustion peak temperature are investigated. From the dependence of propagation velocity on combustion temperature an activation energy of 170.99 kJ/mole is obtained for SH-synthesis of NiAl. The synthesized products showed equiaxed large grained microstructures.     

连铸保护渣的结晶性能及其模型预测

 利用差热分析仪,研究连铸保护渣的结晶温度与碱度、Na2CO3含量、CaF2含量、Al2O3含量和MgO含量之间的关系,进而通过建立非线性规划模型,对连铸保护渣的结晶性能进行优化设计和模型预测。在本实验渣系条件下,连铸保护渣的结晶温度随着碱度、综合碱度、Na2CO3含量、CaF2含量和MgO含量的增加而升高,随着Al2O3含量的增加而降低。     

粉矿湿式预选在金岭铁矿选矿厂的应用

为提前抛弃部分最终尾矿，提高入选矿石品位，降低磨矿能耗，通过实验室试验和半工业试验，证明了粉矿湿式预选技术预选尾矿铁品位仅为4．38％，铜品位0．038％，钴品位0．0103％，均低于或接近湿选尾矿品位，完全可以作为合格尾矿抛去．应用表明，球磨机处理量达到40t／h，比设湿式预选作业前提高5t／h，废石品位符合抛废要求，抛废产率为8.04％，每年可创经济效益70万元以上．