Preparation and characterization of electroless Ni-Fe-P alloy films on fly ash cenospheres

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• 作者：Jianfeng Pang ; Qin Li ; Bing Wang ; Dejing Tao ; Xiaotian Xu ; Wei Wang ; Jianping Zhai ; ^{jpzhai@nju.edu.cn}
• 关键词：Electroless plating ; Ni-Fe-P alloy ; Fly ash cenospheres ; Crystal structure ; Magnetic properties
• 刊名：Powder Technology
• 出版年：2012
• 出版时间：August, 2012
• 年：2012
• 卷：226
• 期：Complete
• 页码：246-252
• 全文大小：1073 K

文摘

The process of depositing Ni-Fe-P alloy films on fly ash cenospheres (FACs) through modified electroless plating is documented. A coupling procedure was used with ¦Ã-aminopropyltriethoxy silane (APS) as coupling agent and silver nitrate as activator. The resultant Ni-Fe-P/FACs composites were characterized by scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), X-ray photoelectron spectroscopy (XPS), differential scanning calorimetry (DSC), X-ray diffractometry (XRD) and vibrating sample magnetometry (VSM). The results show that continuous and uniform films of Ni-Fe-P alloy were obtained on the surfaces of the FACs. DSC traces indicated that two distinct exothermic peaks appeared during the heat treatment, which moved to higher temperature with decrease in mole ratios of Ni²⁺/Fe²⁺ in the coating. XRD spectra confirmed that electroless Ni-Fe-P alloy deposits were amorphous in the as-plated condition, which transformed from the amorphous to crystalline phase with increase in calcining temperature. In addition, VSM data revealed that the resulting sample exhibited characteristics of soft magnetic materials at room temperature. The magnetic performances of the composites would be ameliorated with an increase in iron content in the coating and calcining temperature.