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Synthesis and exothermic reactions of ultra-fine snowman-shaped particles with directly bonded Ni/Al interfaces

机译:具有直接键合的Ni / Al界面的超细雪人形颗粒的合成和放热反应

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摘要

Nickel-nanoparticle-attached aluminum (Ni/Al) particles are synthesized by plating Ni onto Al particles with the surface oxide partly removed. The microstructure of the synthesized Ni/Al particles resembles a child's snowman, with an approximately 200 nm spherical Ni nanoparticle bonded onto the surface of an Al particle about 800 nm in size. Particularly, the surface oxide is rarely observed at the Ni/Al interfaces unlike uncoated surface of the Al powder. Due to these microstructural characteristics, it was clearly noted that a self-propagating high-temperature synthesis (SHS) reaction of the snowman-shaped Ni/Al (SNA) particles occurs more actively compared to that which occurs when simply mixing particles of Ni and Al in the temperature range of 720-900 K. The formation of intermetallic compounds of NiAl or NiAl3 is confirmed in a comparison of XPS results after both samples were oxidized at 773 K. The exothermic enthalpy energy, 8,850 Jg(-1) of SNA particles represents 118% of the value of 7,580 Jg(-1) for the mixed particles. These results indicate that SNA particles are promising as advanced reactive materials when used in conjunction with an efficient SHS reaction.
机译:通过将Ni镀到部分去除了表面氧化物的Al颗粒上,可以合成附着镍-纳米颗粒的铝(Ni / Al)颗粒。合成的Ni / Al颗粒的微观结构类似于儿童的雪人,其中约200 nm的球形Ni纳米颗粒键合在大小约为800 nm的Al颗粒的表面上。特别地,与Al粉末的未涂覆表面不同,在Ni / Al界面处很少观察到表面氧化物。由于具有这些微观结构特征,因此可以清楚地注意到,与单纯混合Ni和Al颗粒时相比,雪人形Ni / Al(SNA)颗粒的自蔓延高温合成(SHS)反应更加活跃。 Al在720-900 K的温度范围内。两个样品在773 K氧化后,通过XPS结果的比较,证实形成了NiAl或NiAl3的金属间化合物。SNA的放热焓为8,850 Jg(-1)颗粒占混合颗粒的7,580 Jg(-1)值的118%。这些结果表明,当与有效的SHS反应结合使用时,SNA颗粒有望用作高级反应材料。

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  • 来源
    《Applied Surface Science》 |2019年第15期|481-485|共5页
  • 作者单位

    Korea Inst Mat Sci, Met Powder Dept, 797 Changwon Daero, Chang Won 51508, Gyeongnam, South Korea|Pusan Natl Univ, Dept Nano Fus Technol, 2 Busandaehak Ro 63Beon Gil, Busan 46241, South Korea;

    Korea Inst Mat Sci, Met Powder Dept, 797 Changwon Daero, Chang Won 51508, Gyeongnam, South Korea;

    Korea Inst Mat Sci, Met Powder Dept, 797 Changwon Daero, Chang Won 51508, Gyeongnam, South Korea;

    Korea Inst Mat Sci, Met Powder Dept, 797 Changwon Daero, Chang Won 51508, Gyeongnam, South Korea;

    Korea Inst Mat Sci, Met Powder Dept, 797 Changwon Daero, Chang Won 51508, Gyeongnam, South Korea;

    Pusan Natl Univ, Dept Nano Fus Technol, 2 Busandaehak Ro 63Beon Gil, Busan 46241, South Korea|Pusan Natl Univ, Dept Nanoenergy Engn, 2 Busandaehak Ro 63Beon Gil, Busan 46241, South Korea;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Reactive metal powder; Nickel coating; Aluminum; SHS reaction;

    机译:活性金属粉末;镍涂层;铝;SHS反应;

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