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目前,关于感应加热电磁场对Ni/Al粉末混合物加热机制以及原料粒度对合成产物微观形貌和性能的影响报道较少。采用电磁感应加热的方式对Ni粉和Al粉压坯进行点火触发自蔓延合成反应,生成Ni Al金属间化合物。利用XRD、SEM、EDS、纳米压痕等测试技术分析了生成物的相组成、微观结构和力学性能。结果表明:在原料中Al粉的粒径足够大时,电磁感应加热辅助自蔓延合成Ni Al金属间化合物能够实现全液相合成Ni Al单相,持续加载的电磁场、较大的线圈电流可能会抑制晶粒的长大,提高合成产物的力学性能。
At present, there are few reports about the heating mechanism of the Ni / Al powder mixture and the particle size of the Ni / Al powder mixture on the microstructure and properties of the synthesized product by induction heating electromagnetic field. The Ni-Al and Al powder compacts were subjected to ignition-triggered self-propagating synthesis reaction by electromagnetic induction heating to produce NiAl intermetallic compounds. The phase composition, microstructure and mechanical properties of the product were analyzed by XRD, SEM, EDS and nanoindentation. The results show that when the size of Al powder in the raw material is large enough, the electromagnetic induction heating assisted self-propagating synthesis of NiAl intermetallic compound can realize single-phase, continuous loading of electromagnetic field in the whole liquid phase. The larger coil current may Inhibit grain growth, improve the mechanical properties of synthetic products.