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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-base superalloy powder was prepared by plasma rotating electrode powdering process (PREP) and one of the abnormal particles was observed, classified, counted and analyzed. The results show that there are abnormal particles in the alloy powder which are composed of powder, sublimate, slag, ceramic and organic matter. The generation of such abnormal particles and the purity of the mother alloy, inclusions, atomization milling process parameters are closely related. The ability to screen and electrostatically treat anomalous particles is related to the size, morphology, and chemical composition and density, dielectric constant, and other physical properties of the adhering inclusions. Compared with the screening treatment, the amount of agglomerated particles in the 1 kg powder after electrostatic discharge decreased by 63%. In the finished powder with the diameter of 50-150 μm, the particles of the clinker slag accounted for 36% of the total amount of residual inclusions, 4%, sticky organic particles accounted for 11%.