Synthesis of AlN/Al Alloy Composites by in situ Reaction between Mg3N2 and Aluminum

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  • Kobashi Makoto
    Department of Materials Processing Engineering, School of Engineering, Nagoya University
  • Okayama Norihisa
    Department of Materials Processing Engineering, School of Engineering, Nagoya University
  • Choh Takao
    Department of Materials Processing Engineering, School of Engineering, Nagoya University

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  • Synthesis of AlN/Al Alloy Composites by <I>in situ</I> Reaction between Mg<SUB>3</SUB>N<SUB>2</SUB> and Aluminum
  • Synthesis of AlN Al Alloy Composites by

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Aiming at producing AlN/Al composite materials with the help of an exothermic reaction, spontaneous infiltration of molten aluminum into magnesium nitride (Mg3N2) powders was investigated. In an alumina crucible, a pure aluminum ingot was placed on Mg3N2 powders (either loose or compacted powders). In a nitrogen atmosphere, specimens were heated up to 1473 K and held for 3600 s in order to induce the spontaneous infiltration and the subsequent in situ reaction. During the high-temperature holding, molten aluminum infiltrated into Mg3N2 powders spontaneously, as expected. Neither large pores nor non-infiltrated regions were visible in the cross-section. The cross section of the specimen after the high-temperature holding was analyzed by an X-ray diffraction method. The result revealed a formation of aluminum nitride (AlN) in an aluminum alloy. The sizes and the volume fraction of AlN particles produced from loose Mg3N2 powders were in a range of 5∼50 μm and 21%, respectively. The volume fraction of AlN increased from 21 to 57.4% by using an Mg3N2 powder compact instead of using loose powders. The morphology of synthesized AlN also changed from discrete to continuous by using the powder compact. Differential-thermal-analysis data revealed a sharp exothermic peak caused by the reaction between Mg3N2 and aluminum. During the fabrication process, a sharp increase in the temperature was also observed by a thermocouple embedded in the powder layer. The peak temperature (1840 K) showed a good agreement with a thermodynamically calculated adiabatic temperature (1900 K).

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