【摘要】 采用自蔓延高温合成 (SHS)技术 ,进行 Ti- Ni- Nb形状记忆合金 (SMA)的燃烧合成试验。研究了粉末粒度、纯度和加热温度对热爆燃烧合成的产物组织的影响。结果表明 :纯度高的粉末 ,粒度细的铌粉和粒度适中的钛粉 ,有利于获得密度高和 (Ti,Nb) 2 Ni等杂相少的产物 ;当温度尚未达到热爆温度时 ,只能发生常规反应烧结 ;当达到热爆温度时 ,热爆的产物内存在着基体相 (Ti,Nb) Ni,杂相 (Ti,Nb) 2 Ni和由 β- Nb(Ti,Ni)与基体 (Ti,Nb) Ni形成的共晶相 ;在较高的热爆温度下 ,共晶相基本消失 ,基体晶粒粗化更多还原

【Abstract】 Experiments of the combustion synthesis of the Ti Ni Nb SMA have been done by SHS technique. The influences of powder particle size,purity and heating temperature on the microstructure of thermo explosion synthesised products were investigated. It is found that the powders of higher purity, the fine niobium powders, and the titanium powders with moderate particle size (26μm) are beneficial to the products of high density and less impurity phase, such as (Ti,Nb) 2Ni,etc. Regular reaction sintering occured only as the heating temperature is lower than 1 173 K for thermo explosion reaction. At the thermo explosion temperature , the synthesised products consist of the (Ti,Nb)Ni matrix phase,the (Ti,Nb) 2Ni impurity phase and the eutectic phase β Nb(Ti,Ni) (Ti,Nb)Ni. At the temperature higher than the thermo explosion temperature, the eutectic phase nearly disapperaed, while the matrix grains are coarsened.更多还原