摘要
借助X射线衍射和扫描电镜对铝熔体中生成Al2 O3的原位反应进行热力学和动力学分析 结果表明 :在大气、低温条件下 ,CuO与铝反应能生成δ Al2 O3,δ Al2 O3颗粒在基体合金中能均匀分布 ,大小在 3～ 5 μm ;CuO与铝反应的热力学分析认为反应是可以自发进行的 ;利用宏观反应动力学理论 ,提出微粒模型 ,认为主要影响反应速度的因素是铝液与CuO微粒接触时的浓度、微粒的内部结构、表面积与其体积之比。
A thermodynamical and dynamical analysis of in situ reaction of Al 2O 3 is made with the help of XRD and SEM. The results show that:δ Al 2O 3 particles can be formed by CuO and aluminium reaction in atmosphere and at low temperature (750～800℃) and well distributed in matrix alloy. Particles' size is from 3 to 5 microns; CuO and aluminium reaction can occur spontaneously according to thermodynamics analysis; grain model is established by using macro reaction dynamics theory. It is found that the main factors which affect the reaction rate are aluminium consistence in contacting CuO grain, interior structure of grain, the ratio of grain superficial area and its volume, the figure coefficient of grain, et al.
出处
《江苏大学学报（自然科学版）》
EI
CAS
2002年第2期70-73,共4页
Journal of Jiangsu University：Natural Science Edition
