Al合金无压熔渗多孔SiC预成形坯体的组织变化及机理  

Microstructure Changes and Mechanism of Al alloy Pressureless Infiltration into Porous SiC Perform

作　　者：任淑彬[1] 曲选辉[1] 何新波[1] 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083

出　　处：《材料工程》2009年第S1期1-4,共4页Journal of Materials Engineering

摘　　要：高体积分数SiCp/Al复合材料可以通过Al合金无压熔渗SiC多孔预成形坯体实现其近净形成形。本文通过观察无压熔渗过程中相关的显微组织变化,研究Al合金在SiC多孔坯体中的熔渗行为及机理。研究结果表明:实现Al合金对SiC预成形坯无压自发熔渗的关键是合金中必须存在Mg元素,并且须在氮气氛中进行;正是利用合金中Mg与氮气氛的相互反应在SiC颗粒的表面生成Mg3N2,并通过Mg3N2与Al的反应帮助Al合金顺利熔渗到SiC孔隙中去。High-volume fraction of SiCp/Al composites can achieve their near-net shaped forming by pressureless infiltration of Al alloy into porous SiC preform.Through observation on the change of microstructure,the behavior and mechanism of infiltration were studied during the infiltration of Al alloys into SiC preform.The results show that,the key to realize pressureless infiltration of Al alloy into SiC perform is the existences of both Mg elements in the Al alloy and nitrogen atmosphere;the reactions of Mg alloys with nitrogen and the generated Mg3N2 with Al can promote Al alloys pressureless infiltration into porous SiC.

关 键 词：无压熔渗 铝 SIC 机理 

分 类 号：TB331[一般工业技术—材料科学与工程]