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脈沖放電制備鏈枝狀非晶態Ni-P合金粉體的晶化行為

Crystallization behavior of amorphous Ni-P chain dendritic alloy particles prepared by pulse discharge

  • 摘要: 在鎳鹽溶液中利用脈沖放電技術制備出Ni-P合金粉體,并用場發射掃描電鏡(FESEM)、透射電鏡(TEM)、X射線衍射(XRD)及差熱分析(DTA)等手段研究非晶粉體的晶化行為和組織結構特征.結果表明:Ni-P合金粉體形貌為鏈枝狀,徑向可達500nm左右,長度可達數微米.制備的合金粉體為非晶態結構,在280℃以下熱處理時沒有改變非晶態結構:在300℃開始晶化,析出亞穩相Ni5P2和Ni12P5;在320℃開始析出穩定相Ni和Ni3P;溫度升高到400℃時,亞穩相消失.采用Kissinger公式計算出該合金粉體的晶化激活能為291.76kJ·mol-1.

     

    Abstract: Ni-P alloy particles were synthesized by means of pulse discharge in nickel salt solution.The microstructure characterization and crystallization behavior of the particles were investigated using field emission scanning electron microscopy (FESEM),transmission electron microscopy (TEM),X-ray diffraction analysis (XRD) and differential thermal analysis (DTA).The results show that the particles exhibit the morphology of a dendrite-like and chain-like combination,with the diameter of up to about 500 nm and the length of several microns.Their structure is amorphous and maintains at temperatures lower than 280 ℃,but begins to crystallize into metastable phases Ni5P2 and Ni12P5 at 300 ℃.Ni and Ni3P stable phases appear at 320 ℃,and the metastable phases disappear above 400 ℃.The crystallization activation energy is 291.76 kJ·mol-1 determined by the Kissinger equation.

     

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