论文部分内容阅读
在镍盐溶液中利用脉冲放电技术制备出Ni-P合金粉体,并用场发射扫描电镜(FESEM)、透射电镜(TEM)、X射线衍射(XRD)及差热分析(DTA)等手段研究非晶粉体的晶化行为和组织结构特征.结果表明:Ni-P合金粉体形貌为链枝状,径向可达500nm左右,长度可达数微米.制备的合金粉体为非晶态结构,在280℃以下热处理时没有改变非晶态结构:在300℃开始晶化,析出亚稳相Ni5P2和Ni12P5;在320℃开始析出稳定相Ni和Ni3P;温度升高到400℃时,亚稳相消失.采用Kissinger公式计算出该合金粉体的晶化激活能为291.76kJ.mol-1.
The Ni-P alloy powders were prepared by pulse discharge technique in nickel salt solution and characterized by field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), X-ray diffraction (XRD) and differential thermal analysis (DTA) The results show that the morphology of the Ni-P alloy powder is chain-branched, with the radial length up to about 500nm and the length up to several microns. The prepared alloy powders are amorphous Structure. The amorphous structure was not changed during the heat treatment below 280 ℃. Crystallization started at 300 ℃, and metastable phases Ni5P2 and Ni12P5 were precipitated. The stable phases Ni and Ni3P began to precipitate at 320 ℃. When the temperature increased to 400 ℃, The steady-state disappear.The Kissinger formula was used to calculate the crystallization activation energy of the alloy powder 291.76kJ.mol-1.