NiAl金属间化合物热爆合成动力学的试验研究

Experimental Study on Thermal Explosion Dynamics of NiAl Intermetallic Compound

通过粉坯密度、加热速率、颗粒尺寸及合金元素等对ＮｉＡｌ热爆的点燃温度及最高反应放热温度的影响，研究了热爆合成的动力学规律。结果表明，热爆合成的点燃温度随颗粒尺寸的增大、加热速率的加快、粉坯密度的增加（ρｇｒ／ρｔｈ≤６５％）或降低（ρｇｒ／ρｔｈ≥６５％）而升高。其反应最高温度随镍颗粒尺寸的增大，加热速率的加快和粉坯密度的增加而升高。合金元素使点燃温度高，Ｔｉ及Ｃ使反应最高温度升高，Ｆｅ使最高反应温度降低。

The effect of the green density,heating rate,size of the particle and alloying element on the reaction velocity of the thermal explosion for synthesizing a NiAl intermetallic compound has been investigated in order to study the kinetic law of thermal explosion synthesisResults show that the ignition temperature is increasing with increasing the size of the particle,green density (45%≤ρ gr /ρ th ≤65%),and with decreasing the heating rate and green density(65%≤ρ gr /ρ th ≤85%)The maximum temperature of thermal explosion is increasing with an increase in the size of Ni particle,heating rate and green densityThe alloying elements result in an increase in the ignition temperatureThe maximum temperature in Ni-Al-Fe system is lower that that in the Ni-Al system and the maximum temperature in Ni-Al-Ti-C system is higher