(福州大学 材料科学与工程学院, 福州 350002)
摘 要: 设计了一种用于Sn-Sb等滑动轴承合金的无容器接触深过冷快速凝固装置。 并以热流分析为基础， 利用传热模型和物理模型计算了Sn-16%Sb（质量分数）过包晶合金在本装置中的冷却速度。 结果表明： 在粒子直径为4mm时， 粒子的冷却速度为3.1×102 K/s； 当粒子直径为0.1mm时， 冷却速度达到了105 K/s。 Sn-Sb包晶合金组织显著细化， 初生相SnSb化合物高度弥散化。
关键字: Sn-Sb包晶合金； 无容器凝固装置； 快速凝固； 晶粒细化
（School of Materials Science and Engineering,
Fuzhou University, Fuzhou 350002, China ）
Abstract: A new containerless rapid solidification device used to prepare Sn-Sb journal bearing alloys was developed. Based on the theory of heat flux, the cooling rate of Sn -16%Sb hyperperitectic alloy prepared by the device was calculated by means of modes of heat transfer and physics. The calculation results indicate that the cooling rate of a 4mm size droplet is 3.1×102K/s and the cooling rate of a 0.1mm size droplet is 105 K/s. The experiment results show that the rapidly-solidified Sn-16%Sb hyperperitectic alloy exhibits notably refined grain and highly dispersed primary intermetallic SnSb phase, indicating that the device achieved grain refinement effects.
Key words: Sn-Sb peritectic alloy; containerless solidification device; rapid solidification; grain refinement
