摘要
用Friedman法研究了非等温DSC条件下燃烧合成反应Ti+3Al→TiAl3的复杂反应动力学.该合成反应并非单步合成反应,而是有中间相TiAl出现的多步反应.它包含三个子过程,其激活能分别为109,175和89kJ/mol.控制反应速度的这三个过程分别对应反应初期的Ti（固）和Al（液）间的直接反应、中期的Ti-Al扩散偶中Al通过TiAl3层的扩散以及反应后期的TiAl-Al扩散偶中Al通过TiAl3层的扩散.
Under the non-isothermal DSC conditions, the chemical kinetics of the combustion synthesis reaction Ti+3Al-->TiAl3 was studied by Friedman method. The combustion synthesis reaction is a complex reaction during which a transitional product of TiAl is formed. Three processes of the reaction are determined and possess activation energies of 109, 175 and 89 kJ/mol, respectively. The rate-controlling steps of these three processes are interpreted as the direct chemical reaction between Ti(s) and Al(l) to form TiAl3, the diffusion of Al through TiAl3-layer in Ti-Al, and TiAl-Al diffusion couples.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
2002年第10期1027-1030,共4页
Acta Metallurgica Sinica
基金
国家自然科学基金资助项目 50071016
关键词
燃烧合成
TIAL3
DSC
反应动力学
combustion synthesis
TiAl3
differential scanning calorimetry (DSC)
chemical kinetics
