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采用液相脉冲放电技术,通过改变脉冲电压、放电次数、Ni2+浓度、pH值,以及加入稀土添加剂(LaCl3、NdCl3)等途径,研究了制备工艺中各因素对Ni-P合金粉的结构、形貌、粒径以及对Ni2+转化率的影响.结果表明,脉冲能量是影响Ni-P合金粉粒径和Ni2+转化率的主要因素,提高脉冲电压或增加放电次数,Ni-P合金粉平均粒径明显减小,而Ni2+转化率增大.聚焦光束反射测量仪(FBRM)实时监测结果表明,在放电过程中Ni-P合金粉的形核、生长速率显著大于放电结束之后的形核、生长速率.加入LaCl3、NdCl3能使Ni-P合金粉粒径减小,LaCl3质量浓度为0.1g.L-1时制得的Ni-P合金粉平均粒径为156nm,NdCl3质量浓度为0.05g.L-1时其平均粒径为72nm.
The effects of various factors on the structure and shape of Ni-P alloy powder were studied by liquid-phase pulse discharge technique by changing the pulse voltage, discharge times, Ni2 + concentration, pH and adding rare earth additives (LaCl3, NdCl3) Morphology and particle size as well as the effect on Ni2 + conversion.The results show that the pulse energy is the main factor affecting the particle size and Ni2 + conversion of Ni-P alloy powder, and the pulse voltage or increasing the number of discharges, the average particle size of Ni-P alloy powder And the conversion rate of Ni2 + increased.The results of real-time monitoring of FBRM showed that the nucleation and growth rate of Ni-P alloy powder during discharge were significantly higher than those after the discharge, and the growth rate .The addition of LaCl3 and NdCl3 can decrease the particle size of Ni-P alloy powder, the average particle size of Ni-P alloy powder is 156nm when the concentration of LaCl3 is 0.1gL-1, and the concentration of NdCl3 is 0.05gL-1 The average particle size is 72 nm.