金属Be真空出气性能的测试

利用四极质谱计测试了国产金属铍材在 10 0℃～ 6 0 0℃不同温度下的真空出气成分及相对含量 ,实验得出铍的大量出气主要在温度 4 0 0℃～ 5 0 0℃之间 ,其放出气体的主要成分按放气量大小依次为H2 O ,CO2 ,N2 ,CO ,Ar和H2 ,利用限流小孔半定量的计算了铍材的出气量。     

高压锅炉补给水系统管道的腐蚀

讨论了锅炉补给水管道的腐蚀情况 ,指出溶解氧和二氧化碳是产生腐蚀的主要原因 ,其腐蚀速率为0 .4 2mm/a。确保真空除气系统正常运行和二级除盐水箱的密封效果是控制腐蚀的主要手段。在此情况下 ,该管线尚可运行 7年     

脉冲进气旋转喷吹技术的水力模拟

在铝合金熔体净化旋转喷吹技术的基础上 ,采用水力模拟实验研究了脉冲进气方式对气泡大小的影响。实验结果表明 :脉冲进气方式有利于产生射流 ,使气泡变小 ,并增加了气泡与熔体接触的比表面积 ,从而改善了除氢的动力学条件 ,有利于提高除氢效果。     

Decarburization rate of RH refining for ultra low carbon steel

The decarburization behaviors of ultra low carbon steel in a 210-t RH vacuum degasser were investigated under practical operating conditions.According to the apparent decarburization rate constant (KC) calculated by the carbon content in the samples taken from the hot melt in a ladle at an interval of 1-2 min,it is observed that the total decarburization reaction period in RH can be divided into the quick decarburization period and the stagnant decarburization period,which is quite different from the tradit...     

熔化条件和除气工艺对镁熔体含氢量的影响

利用自行开发的镁合金定量测氢仪研究了熔化条件和除气工艺对镁熔体含氢量的影响。研究结果表明,镁熔体中的含氢量随温度的升高而增大;气体保护下熔炼比熔剂保护的效果好,含氢量较低;随保温时间的延长,气体保护下的镁熔体含氢量几乎没变化,而熔剂保护下的含氢量成小幅上升趋势;采用Ar气除气工艺的效果比C2Cl6除气更有效,镁熔体含氢量更低。     

Characterization of centrifugally atomized Al-12Si-5Fe-3Cu-1Mg(wt%) alloy powder and extruded rod

The Al-12Si-5Fe-3Cu-1Mg(wt%) alloy was rapidly solidified by centrifugal atomization. The microstructural characteristics of rapidly solidified powder and the microstructure changes with heat treatment were investigated in terms and related to powder size. The microstructures of the powder consisted of dendritic -Al, eutectic phase, Cu-rich phase, and needle-like intermetallic compounds. These phases were much finer than that of ingot cast structure and the size decreased with increasing cooling rate. The X-ray diffraction of the atomized powders revealed the presence of non-equilibrium 3-(AlFeSi) intermetallic phase. This phase appeared to transform to an equilibrium -(AlFeSi) phase by heating at temperatures above 470°C. The extruded rod which was hot extruded at 360°C with an extrusion ratio of 40:1 also revealed the presence of the -(AIFeSi) intermetallic phase. Using DSC, the exothermic peak due to precipitation from the supersaturated -Al matrix was observed in the range of 200–250°C during continuous heating of atomized powder, and the size of the peaks increased with decreasing powder size.     

超前瓦斯排放钻孔有效排放半径的测定

介绍了煤层超前钻孔的防突机理,比较和分析了超前瓦斯排放钻孔有效排放半径的3种测定方法,选择钻屑量与钻屑瓦斯解吸指标法进行了现场应用。应用结果表明,使用钻屑量与钻屑瓦斯解吸指标法测定排放钻孔的有效排放半径简便易行,准确可靠。     

环保型稀土铝熔剂的研究

研究环保型稀土铝熔荆的除镁、除气及晶粒细化效果，试验表明环保型稀土铝熔荆在740℃具有高效的除镁效果；在700℃时可使100g铝液中的氢含量只有0．08mL；当加入量为铝液的1．5％可获得细小等轴晶的良好铸造组织。     

高性能粉末冶金材料与其制造工艺的开发

随着常规粉末冶金产业发展，像锻轧粉末冶金铝合金、超塑性高温合金、机械合金化氧化物弥散强化（ODS）合金之类的先进粉末冶金工艺，引起了人们的注意。受先进粉末冶金工艺启发，开发了适应日本汽车与家电产业的新材料与生产工艺，开发了适合于钢铁结构的粉末冶金Al-Si-X合金。为了改进经济性与近终形（NNS）成形性，开发了无包套粉末挤压工艺与精压式粉末锻造工艺。基于这些工艺，还开发了比单一结构材料具有较多功能的新材料，诸如轻量散热器（heat sink）与高性能发动机气缸内衬。     

ZL205A铝合金熔体净化效果分析

介绍了铝熔体中夹杂物与气体的主要存在形态及其相互作用。结合生产应用实践．简述了ZL205A铝合金熔体的净化工艺及其影响因素，提出铝液的净化应以除渣为主．去气为辅。