共查询到18条相似文献,搜索用时 78 毫秒
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石应江 《有色金属材料与工程》1993,(6)
联系西北有色金属研究院高纯钛生产实际,叙述了碘法,熔盐电解法,电子束熔炼法,电子束区域熔炼法等传统高纯钛生产方法的进展及应用现状,指出每一单一的传统精炼方法都日益不能满足电子工业对高纯钛纯度的要求,而目前比较经济的方法是将多种单一方法组合起来形成复合工艺,如熔盐电解-电子束熔炼法,电子束熔炼-电子束区域熔炼法。并介绍了很有发展前途的固相电解、激光精炼新工艺和高纯钛在半导体器件和高真空设备中的应用状况。 相似文献
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介绍了电子束熔炼炉的工作原理、电子束熔炼法钼电极的特性及其应用效果;指出电子束熔炼法钼电极纯度高、密度高、晶粒粗大,是适宜用作电阻法生产硅酸铝耐火纤维的电极。 相似文献
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电子束冷床炉熔炼是一种新兴的金属精炼方法。利用电子束冷床炉的高温真空精炼特性,以钒成分为82%钒铝合金为原料,制备了纯度在99.7%以上的金属钒铸锭。详细论述了电子束冷床炉在熔炼钒铝合金时各杂质元素的去除机理行为,认为熔炼时较大的电子束照射功率对一次铸锭中铝的挥发去除有较好效果,但这种熔炼工艺却会影响到铸锭的最终氧含量。分析认为,两次小功率熔炼是符合设备特点的制备高纯金属钒铸锭的最佳熔炼工艺。 相似文献
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电子束冷床熔炼参数对熔池表面温度的影响 总被引:4,自引:0,他引:4
使用M9100图像高温仪精确测定了TC4合金电子束冷床熔炼时坩埚和冷床熔池表面的温度.结果表明,结果表明,熔炼工艺参数如熔化速度、熔炼功率、电子束扫描方式和扫描频率都会对熔池表面温度产生剧烈影响. 相似文献
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通过对比分析VAR炉与电子束冷床炉(EB炉)熔炼工艺认为EB炉可以实现硬心海绵钛熔炼,并开展硬心海绵钛在电子束冷床炉(EB炉)中的熔铸验证试验,对熔铸后钛锭进行理化分析,跟踪钛锭后续应用情况,初步验证了电子束冷床炉熔炼硬心海绵钛的可行性。 相似文献
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采用电子束选区熔化技术制备Nb521合金,研究其致密化成形工艺。通过对成形试样的组织、物相、显微硬度、室温拉伸性能的检测与分析,探讨了电子束选区熔化成形Nb521合金的机理。结果表明,电子束选区熔化成形过程中,电子束熔化电流及速度的合理匹配,是得到表面质量及内部质量优异的成形样品的基础;电子束能量密度为340 J/mm3时,样品的密度达到8.78~8.79 g/cm3; Nb521合金显微组织沿沉积方向呈柱状晶,晶粒沿(200)晶面有较强的择优生长取向;成形样品中除Nb基体相外,还存在少量的Nb2C与Zr C碳化物析出;样品室温抗拉强度达到384 MPa,屈服强度为307 MPa,断后延伸率为16.5%;显微硬度处于1 500~1 700 MPa之间,无各向异性。 相似文献
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The electron beam cold hearth melting (EBCHM) process has emerged as either an alternative or a complement to vacuum arc remelting,
since it is capable of enhancing the elimination of hard-alpha inclusions by dissolution or sedimentation. The present article
describes the use of a mathematical model to simulate the electron beam melting of titanium in a cold hearth. The mathematical
model is based on the numerical solution of the coupled momentum, solute, and heat transport equations in a transient regime
for a three dimension geometry. The model calculates the velocity, turbulence intensity, temperature, and alloy composition
in the liquid and the solid phases. The calculation provides the overall heat balance and the volatilization of metallic elements
such as aluminum. A postprocessor numerical tool simulates also the behavior of a hard-alpha inclusion during melting (trajectory
and kinetics of dissolution). In order to demonstrate the usefulness of this model, the authors examine the influence of the
casting rate and of the beam scanning frequency on the volatilization of aluminum and on the capacity of the process to remove
hard-alpha defects. 相似文献
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Lin Charis I. Yamamoto Namiko King Derek S. Singh Jogender 《Metallurgical and Materials Transactions A》2021,52(6):2149-2154
Metallurgical and Materials Transactions A - Friction welding or electron/laser beam welding of nickel superalloys compromises the microstructure with localized melting and heat-affected zones... 相似文献
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介绍了钼和钼-铌单晶的制备原理、制备工艺及电子束区域熔炼炉组成结构。对熔炼室真空度、聚焦、原料棒化学成分、尺寸规格、熔炼速度,搅拌速度等对单品制备的影响进行了详细分析。 相似文献
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Jin J. Gao R. Peng H. Guo H. Gong S. Chen B. 《Metallurgical and Materials Transactions A》2020,51(5):2411-2429
Metallurgical and Materials Transactions A - The solidified microstructure and carbide precipitation behavior in an S390 high-speed steel processed by electron beam melting (EBM) have been fully... 相似文献
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高纯钨单晶坯料预处理工艺研究 总被引:3,自引:1,他引:2
探讨了三种预处理工艺,讨论了不同工艺方法对熔炼稳定性、排除间隙杂质的作用的影响,采用高纯仲钨酸铵(APT)经还原、高温烧结、电子束熔炼预处理工艺,可有效降低间隙杂质元素含量,保证电子束悬浮区域熔炼过程的稳定性,制备出材质优良、性能稳定的高纯钨单晶产品。 相似文献
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A. Munitz S. P. Elder-Randall R. Abbaschian 《Metallurgical and Materials Transactions A》1992,23(6):1817-1827
Electromagnetic levitation and electron beam surface melting were employed to study the effects of supercooling and cooling
rate on the solidification of Cu-10 wt pct Co alloys. Two major effects were observed in the supercooled alloys: the nucleation
of a metastable copper-rich phase which contains 13 wt pct to 20 wt pct Co in samples supercooled between 105 and 150 K and
liquid phase separation which occurs in samples supercooled 150 K or more. The microstructure of the electron beam melted
surfaces consisted of very fine spheres which were similar to those of the sample supercooled more than 150 K but with a refined
microstructure. The results indicate that a dynamic bulk supercooling of 150 K may exist in the molten pool during the solidification
of electron beam melted surfaces. 相似文献