PREP工艺制取镍基高温合金粉末中的异常颗粒  

Abnormal Particles in Ni-Base Superalloy Powder by PREP Process

作　　者：张莹[1] 黄虎豹[1] 刘明东[1] 张义文[1] 

机构地区：[1]钢铁研究总院高温材料研究所,北京100081

出　　处：《稀有金属材料与工程》2017年第11期3485-3490,共6页Rare Metal Materials and Engineering

摘　　要：采用等离子旋转电极制粉工艺(PREP)制取镍基高温合金粉末并对其中的一种异常颗粒进行了观察、分类、统计和分析。结果表明,合金粉末中存在粉末与升华物、熔渣、陶瓷、有机物粘连为一体的异常颗粒。这类异常颗粒的产生与母合金的纯净度、夹杂的性质、雾化制粉工艺参数有密切的关系。筛分和静电处理异常颗粒的能力与所粘连夹杂物的尺寸、形态以及化学组成和密度、介电常数等物理性质有关。与筛分处理相比,静电后1 kg粉末样品中粘连夹杂的颗粒减少了63%;在50~150μm的成品粉中,粘连熔渣的颗粒占残存夹杂物总量的36%,粘连陶瓷颗粒为4%,粘有机物颗粒占11%。Nickel-based superalloy powder was prepared by Plasma Rotating Electrode Process（PREP）. Then a kind of abnormal particles in the superalloy powder was observed, classified, and analyzed statistically. The results show that there are abnormal particles which consist of powder and adhering sublimation, slag, ceramic and organic impurities in the superalloy powders. The formation of the abnormal particles is closely related to the purity of master alloys, properties of inclusions as well as powder atomization parameters. The ability of removing abnormal particles by screening and electrostatic separation is associated with the size, shape and chemical composition and physical properties（density, permittivity） of adhering inclusions. Compared with the screening process, the number of abnormal particles in 1 kg powder sample is reduced by 63% after electrostatic separation process. In 50~150 μm finished powders, the abnormal particles adhering slag account for 36% in residual inclusions, the particles adhering ceramic 4%, and the particles adhering organic 11%.

关 键 词：PREP工艺 镍基高温合金粉末 静电分离 异常颗粒 

分 类 号：TF123.23[冶金工程—粉末冶金]