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射頻等離子體制備球形鎢粉的研究
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新金屬材料國家重點(diǎn)實(shí)驗(yàn)室開放基金 (2010Z-09)；北京市先進(jìn)粉末冶金材料與技術(shù)重點(diǎn)實(shí)驗(yàn)室開放基金


Preparation of Spherical Tungsten Powder by RF Induction Plasma
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    摘要:

    通過射頻等離子體球化處理工藝，以不規(guī)則形狀鎢粉為原料，制備了球形鎢粉，并研究了加料速率和粉末粒度對粉末球化率的影響。采用掃描電子顯微鏡、X射線衍射和激光粒度分析儀對球化處理前后粉末的形貌、物相和粒度分布進(jìn)行了測試和分析。結(jié)果表明：粒度在5.5~26.5 μm范圍的不規(guī)則形狀鎢粉，經(jīng)等離子球化處理后得到表面光滑、分散性好、球化率可達(dá)100%的球形鎢粉。球化處理后，粉末的粒度略微增大。隨加料速率的增加，鎢粉的球化率降低。隨著鎢粉球化率的提高，粉末的松裝密度和流動性得到顯著改善。松裝密度由6.80 g/cm3 提高到11.5 g/cm3，粉末流動性由14.12 s/50 g提高為6.95 s/50 g

    Abstract:

    Spherical tungsten powder was prepared by radio frequency (RF) plasma with irregular tungsten powder as starting material. The effect of feeding rate and particle size on the spheroidization efficiency was studied. The phase composition, morphologies and particle size distributions of the powder before and after spheroidization were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and laser micron sizer (LMS). The results show that the spherical tungsten powder can be obtained from irregular powder with particle size of 5.5-26.5 μm after RF plasma spheroidization. The powder presents smooth surface and good dispersity, and the spheroidization efficiency is almost 100%. The particle size of tungsten powder is increased slightly after plasma treatment. The spheroidization efficiency of the sample decreases gradually with increasing of the feeding rate. The loose density and powder flowability of tungsten powder are enhanced greatly after RF plasma processing. The loose density is raised from 6.80 g/cm3 to 11.5 g/cm3 and the powder flowability is improved from 14.12 s/50 g to 6.95 s/50 g

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盛艷偉,郝俊杰,郭志猛,邵慧萍,黃 化.射頻等離子體制備球形鎢粉的研究[J].稀有金屬材料與工程,2011,40(11):2033~2037.[Sheng Yanwei, Hao Junjie, Guo Zhimeng, Shao Huiping, Huang Hua. Preparation of Spherical Tungsten Powder by RF Induction Plasma[J]. Rare Metal Materials and Engineering,2011,40(11):2033~2037.]
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  • 收稿日期:2010-12-14
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