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采用粉末冶金法以铝粉和镍粉为原料合成NiAl和Ni3Al金属间化合物粉体,对Ni-Al金属间化合物及相关反应进行了热力学计算,并对不同的反应阶段进行了动力学分析,总结出Ni-Al金属固相反应过程的机理。实验结果表明,Ni-Al金属固相反应生成物形成的顺序为NiAl3→Ni2Al3→NiAl→Ni3Al。Ni粉和Al粉原子配比为1︰1的物料,在750℃左右反应可以获得结晶完整纯度较高的NiAl粉体,反应温度超过铝熔点温度时,升高温度对反应产物的成分影响不大;Ni粉和Al粉原子配比为3︰1的物料,在1 200℃左右反应可以获得结晶完整纯度较高的Ni3Al粉体,提高反应温度有利于提高Ni3Al的转化率。
The powders of NiAl and Ni3Al were synthesized by powder metallurgy using aluminum powder and nickel powder as raw materials. The thermodynamic calculations of Ni-Al intermetallic compounds and related reactions were carried out. The kinetic analysis of different reaction stages was carried out. Out of Ni-Al metal solid phase reaction mechanism. The experimental results show that the formation order of Ni-Al solid-state reaction products is NiAl3 → Ni2Al3 → NiAl → Ni3Al. Ni powder and Al powder atomic ratio of 1: 1 material, at about 750 ℃ reaction can be obtained with high purity crystalline NiAl powder, the reaction temperature exceeds the melting point of aluminum, the increase in temperature on the composition of the reaction product The Ni3Al powder with high purity and purity can be obtained by the reaction of 1: 1 ratio of Ni powder and Al powder with the ratio of 3: 1. Improving the reaction temperature is beneficial to improve the conversion rate of Ni3Al.