双环缝喷射共沉积SiC颗粒的捕获与分布研究  

Capture Mechanism and Distribution of SiC Particles in Spray Co-Deposition

作　　者：蔡建国[1] 陈刚[1] 

机构地区：[1]湖南大学材料科学与工程学院,湖南长沙410082

出　　处：《湖南大学学报（自然科学版）》2007年第12期50-53,共4页Journal of Hunan University:Natural Sciences

基　　金：湖南省自然科学基金资助项目(05JJ30193)

摘　　要：采用坩埚移动式喷射共沉积装置及其双环缝复合雾化器制备了SiC颗粒增强铝基复合材料坯件,研究了过程中增强颗粒的捕获机制及特点.实验结果表明,双环缝复合雾化器所引入的SiC颗粒捕获率较高,分布均匀;增强颗粒主要在雾化初时阶段被雾化液滴所捕获,而沉积坯表面因基本呈固相且温度较低,对SiC颗粒的直接捕获效果不明显;沉积坯快冷凝固界面前沿捕获对SiC颗粒的分布影响不大,SiC颗粒在沉积坯中的最终分布主要取决于由雾化液滴对增强颗粒的捕获,特别决定于SiC颗粒在单个雾化颗粒内部及空间雾化颗粒群中的分布.SiC particles reinforced aluminum alloy matrix composite preformances were prepared by a new Crucible Movable Spray Deposition equipment with a dualcircular atomizer. The capture mechanism and the characteristics of the particles were studied with experiments. The dualcircular atomizer was involved with the higher capture efficiency and the uniform distribution of SiC particles. The particles were captured by the atomized droplets at the first stage of atomization. Since the surface of the deposited billet was in the solid state and its temperature was very low, the direct capture effect of SiC particles was not obvious. The capture in the front of the solidification interface had no significant influence on the distribution of SiC particles, and therefore the final distribution was mainly dependent on the capture by atomized droplets, especially on the distribution of SiC particles in the single droplet and that of the atomized droplets.

关 键 词：金属基复合材料 喷射共沉积 SIC 捕获 

分 类 号：TB383[一般工业技术—材料科学与工程]