连续进料参数对超细镍粉表面形貌的影响
Effect of continuous feeding parameters on the surface morphology of ultra-fine nickel powder
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摘要: 以NiCl2·6H2O为原料,采用连续进料方式,通过化学气相沉积法制备超细Ni粉。利用激光粒度仪、扫描电子显微镜、X射线衍射仪等仪器对超细Ni粉相关性能参数进行表征,系统考察进料速率及进料温度等因素对Ni粉表面形貌的影响规律。实验结果表明：随着进料速率和进料温度的提升,Ni粉粒径逐步变大,粒度分布更均匀,分散性更好,球形度更高,结晶性更强,但过度提升进料速率和进料温度,会导致颗粒粗大,较为合适的进料速率和进料温度分别为135 g/h和400 ℃。Abstract: Ultra-fine nickel powder was prepared by continuous feeding chemical vapor deposition method using NiCl2·6H2O as raw material. The effects of feeding rate and temperature on surface morphology of ultra-fine nickel powder were investigated. The laser particle analyzer, SEM and XRD were used to characterize the performance parameters. The results show that as the increment of feeding rate and temperature, the particle size of nickel powder gradually becomes larger, the particle size distribution is more uniform, the dispersion is better, the sphericity is higher and the crystallinity is stronger. But excessive increment in feeding rate and temperature results in the excessive growth of the particle size. The appropriate feeding rate and temperature are 135 g/h and 400 ℃ respectively.
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