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Synthesis, characterization and formation mechanism of Ta-W nanocrystalline composite powders fabricated by nano-in situ composite method

机译：纳米原位复合方法制造的TA-W纳米晶体复合粉末的合成，表征及形成机理

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摘要

To overcome the challenges involved in fabricating Ta-W nano composite powders by using traditional methods, a novel synthesis process of preparing Ta-W nanocrystalline composite powders with a uniform particle size and low oxygen content is proposed in this paper. The process mainly included nano-in situ composite coprecipitation, hydrogen reduction, and a series of reactions with Na and Mg atmospheres. The constitutions, morphologies, and microstructures of the synthesized nanocrystalline powders were characterized by XRD, SEM, TEM, and SAED analyses. The results showed that the (Ta, O)coated W core-shell structure resembles a chocolate-covered peach in an H-2 atmosphere, and the surface of the (Ta, O) phase was changed into a nano-filamentous shell structure in Na and Mg atmospheres. The (Ta, O) phase was transformed into Ta2H in an Na atmosphere at 1193 K, and finally into Ta in an Mg atmosphere at 1213 K. Based on the experimental results, the possible reaction process and formation mechanism of Ta-W nanocrystalline composite powders were investigated. Ta(OH)(5) and APT grains grew together by nucleation and became a nano-sized in situ composite through coprecipitation, and the composite powders containing (Ta, O) and W nanocrystallites reacted in an Na atmosphere by chemical vapor transport (CVT) and a crack-drop process.
机译：为了通过使用传统方法克服制造TA-W纳米复合粉末的挑战，本文提出了一种制备具有均匀粒度和低氧含量的TA-W纳米晶复合粉末的新颖合成方法。该方法主要包括纳米原位复合共沉淀，氢气还原，以及与Na和Mg大气压的一系列反应。合成的纳米晶体粉末的构成，形态和微观结构通过XRD，SEM，TEM和SAED分析表征。结果表明，（TA，O）涂覆的W芯壳结构在H-2气氛中类似于巧克力覆盖的桃，并且（TA，O）相的表面被改变成纳米丝状壳结构na和mg大气压。将（Ta，O）相在1193k的Na气氛中转化为Ta 2H，最后在1213k的Mg气氛中在Mg气氛中转化为Ta。基于实验结果，TA-W纳米晶体复合材料的可能反应过程和地层机理调查了粉末。 Ta（OH）（5）和Apt谷物通过成核在一起，通过共沉淀，成为原位复合材料的纳米大小，并通过化学蒸气转运在Na气氛中反应（Ta，O）和W纳米晶体的复合粉末（CVT ）和一个裂缝的过程。

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  • 来源
    《RSC Advances》 |2016年第107期|共8页
  • 作者

    Chen Yubo; Fan Jinglian; Gong Haoran; Zou Fensheng; Guo Yongzhong; Luo Hang;

  • 作者单位

    Cent S Univ State Key Lab Powder Met Changsha 410083 Hunan Peoples R China;

    Cent S Univ State Key Lab Powder Met Changsha 410083 Hunan Peoples R China;

    Cent S Univ State Key Lab Powder Met Changsha 410083 Hunan Peoples R China;

    Jiangxi Tungsten Ind Grp Co Ltd Nanchang 330096 Jiangxi Peoples R China;

    Jiujiang Tanbre Co Ltd Jiujiang 332014 Jiangxi Peoples R China;

    Cent S Univ State Key Lab Powder Met Changsha 410083 Hunan Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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