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采用强制冷却方法使成分为45(Ti+C)+55Fe(wt-%)的混合粉压坯在燃烧合成时自行熄灭,得到了保留组织转变过程的产物。对其进行了X射线衍射分析和扫描电镜观察,计算了燃烧绝热温度T_(ad),测定了实际燃烧温度T_c和燃烧波温度轮廓。结果表明,燃烧是以固态反应为主的;固态反应引起了Ti粉和Fe粉内燃烧反应的非同步性,TiC粒子分别在原Ti粉和Fe粉的位置相继形成;固态反应还导致了反应的不完全性,原子固态扩散的较低速率使尺寸较大的Fe粉内残留少量无TiC粒子分布区。
A compacted cooling method was adopted to make the powder compact with composition of 45 (Ti + C) + 55Fe (wt-%) self-extinguish during combustion synthesis, and the product which retained the structure transformation was obtained. X-ray diffraction analysis and scanning electron microscope observation were carried out. The adiabatic temperature T ad of the combustion was calculated, and the actual combustion temperature T_c and the temperature profile of the combustion wave were measured. The results show that the combustion is dominated by solid state reaction. The solid state reaction leads to the non-synchronous combustion reaction in Ti powder and Fe powder. The TiC particles form in succession at the positions of the original Ti powder and the Fe powder respectively. The solid state reaction also leads to the reaction Incompleteness, the lower rate of diffusion of atoms in the solid state left a small amount of TiC-free particle distribution in the larger Fe powder.