气体雾化法制备Al基非晶合金粉末工艺及组织结构

发布时间：2018-06-30 03:26

  本文选题：Al基非晶合金 + 气体雾化　； 参考：《北京工业大学学报》2017年04期

【摘要】：针对3D打印用Al基非晶合金粉末的性能需求,利用惰性气体雾化法制备Al_(86)Ni_7Er_5Co_1La_1合金粉末.通过调整过热度、雾化气压、导流管直径来分析不同雾化工艺参数对粉末粒径的影响规律;利用激光粒度分析仪、X射线衍射仪(XRD)、扫描电子显微镜(SEM)和差示扫描量热仪(DSC)对粉末的粒度分布、物相组成、表面形貌、微观组织结构和热稳定性进行分析测试.研究表明:合金粉末的粒径随着雾化气压的增加、导流管直径的减小和过热度的增加而逐渐降低.当过热度100℃、雾化气压9 MPa、导流管直径3 mm时,细粉率最高,其中粒径75μm粉末的质量分数在70%以上.随着粉末粒径的减少,合金粉末的组织结构发生了如下转变:fcc-Al+Al_(17)Er_2+未知相→非晶相+fcc-Al+Al_(17)Er_2+未知相→非晶相+fcc-Al→非晶相,粒径小于25μm的粉末为完全的非晶态.
[Abstract]:In order to meet the requirement of properties of Al based amorphous alloy powder for 3D printing, Al _ (86) Ni _ 7er _ 5Co _ 1La _ 1 alloy powder was prepared by inert gas atomization method. By adjusting the superheat, atomization pressure and the diameter of the guide pipe, the influence of different atomization process parameters on the powder particle size is analyzed. X-ray diffraction (XRD), scanning electron microscopy (SEM) and differential scanning calorimetry (DSC) were used to analyze and test the particle size distribution, phase composition, surface morphology, microstructure and thermal stability of the powder. The results show that the particle size of the alloy powder decreases with the increase of atomization pressure, the diameter of the tube and the superheat. When the superheat is 100 鈩，

本文编号：2084658