Mg与SiO_2玻璃反应组织、动力学及性能特征

Microstructures,Reaction Kinetics and Properties of Reaction Between Magnesium and Silica Glass

通过Mg与SiO2玻璃间反应的研究,获得了由层状组成的反应组织.实验发现:层厚由表及里呈连续细化的变化规律;反应温度越高,反应层及层片厚度增加;反应时间延长,反应层及层片厚度增加.Mg与SiO2反应动力学呈线性关系,其原因是A层段层状存在显微裂纹,显微裂纹的存在使本应呈现非线性规律的Mg向SiO2扩散反应动力学发生了改变.整个反应组织与心部Mg基体结合良好,硬度由表及里呈连续变化,Mg与SiO2玻璃反应获得的是一种典型的梯度材料.

Lamellar-like reaction microstructures were obtained by means of study on the reaction between magnesium and silica glass. The experimental results show that, the thickness of lamellar continuously decrease from the reaction front to core of sample, the thickness of reaction layer and lamellar increase with the increase of temperature and reaction time. Linear reaction kinetic of reaction between magnesium and silica is aresuh of microcrack existed in lamellar. The whole reaction layer has good bonding with magnesium matrix, and the hardness change gradually from the surface to core of sample indicating that typical gradient material is obtained by the reaction.