摘要
采用惰性气体雾化法制备Fe-3％Si-2％Ni-0．5％Al-1％Ti软磁合金粉末，通过化学分析、激光粒度分析仪、电子探针等手段分别对粉末的成分、粒度分布和表面形貌进行表征，研究雾化压力、雾化温度和漏嘴直径对粉末粒径和形貌的影响。结果表明：雾化粉末中的Si、Ni、Al、Tj微量元素的成分偏差可控制在±0．2％以内，粉末碳含量可低至0．011％，氧含量低至0．10％。随着雾化压力由4．5MPa增大到6．5MPa，粉末的中值粒径减小，粉末粒度分布由双峰变为单峰，粉末球形度增大；随着雾化温度由1550℃升高至1650℃，粉末的中值粒径显著减小，粉末球形度先增大后降低；随着漏嘴直径由4mm增加至6mm，粉末的中值粒径增加，粉末球形度先增大后降低。实验得到的较优工艺参数为：雾化压力5．5MPa、雾化温度1600℃、漏嘴直径5mm，粉末粒度在14．45～71．35μm范围内，中值粒径D50为39．75μm，粉末球形度高，表面光洁。
Fe-3% Si-2% Ni-0.5% Al-1% Ti soft magnetic alloy powders were prepared by inert-gas atomization. The composition, size distribution, and surface morphology of the powder were characterized by chemical analysis, laser scattering particle size distribution analyzer and electron probe microanalyzer, respectively. The effects of atomization pressure, temperature and nozzle diameter on the powder size and morphologies were also investigated. The results indieate that composition deviation of Si,Ni,Al,Ti trace elements in the powders can be controlled within ：±0. 2%. Carbon and oxygen contents of the powders are low reach 0.011% and 0. 10%, respectively. With atomization pressure increasing from 4.5 to 6. 5 MPa, the median diameter of the powders decreases and the size distribution of the powders changes from biomodal to unimodal form, and the sphericity of the powders increases. With atomization temperature increasing from 1 550 to 1 650 ℃ , the median diameter of the powders decreases remarkably and the sphericity of the powders increases first and then decreases. With nozzle diameter increasing from 4 to 5 mm, the median diameter of the powders increases and the sphericity of the powders increase first and then decreases. The optimum parameters are as follows： atomization pressure is 5.5 MPa, atomization temperature is 1 600 ℃, and nozzle diameter is 5 mm. The powder size mainly ranges from 14. 45 to 71.35 μm, and the median diameter of the powder is 39.75 μm. The powders possess high sphericity and smooth surface.
出处
《粉末冶金技术》
CAS
CSCD
北大核心
2015年第3期195-201,共7页
Powder Metallurgy Technology
基金
科技部科研院所技术开发研究专项资金(2010EG215058)
