凝固速率对藕状规则多孔结构形成的影响  

Effect of Solidification Rate on Formation of Lotus-type Porous Structure

作　　者：卫真真 金青林[1] 李再久[1] 蒋业华[1] 

机构地区：[1]昆明理工大学材料科学与工程学院,云南昆明650093

出　　处：《热加工工艺》2016年第10期93-96,共4页Hot Working Technology

基　　金：国家自然科学基金项目(51164018)

摘　　要：通过对金属-气体共晶定向凝固过程传热和气泡受力的分析,得到了凝固速率、气泡上浮速率与时间的关系,获得了Gasar工艺中藕状多孔结构形成的速率判据,并进行了实验验证。结果表明:随凝固层厚度的增加,凝固速率降低;当凝固速率低于气泡上浮速率时,藕状多孔结构难以形成。The relationship of solidification rate and bubble rising rate with time was investigated by analyzing the heat transfer and the forces applied on the bubbles in the metal-gas eutectic directional solidification process. The rate criterion for the formation of lotus-type structure in Gasar process was obtained, and verified by the experimental results. The results show that with increasing solidified layer thickness, the solidification rate reduces. It is difficult to form a lotus-type structure when the solidification rate is lower than the bubble rising rate.

关 键 词：定向凝固 凝固速率 气泡上浮速率 

分 类 号：TG146[一般工业技术—材料科学与工程]