等离子烧结法制备FeAl/Al_2O_3复合材料

Synthesizing of FeAl/Al_2O_3 Composite with Mechanical Activation-Spark Plasma Sintering

利用机械活化-放电等离子烧结的方法,将Fe-Al-Al2O3粉末经机械活化后快速烧结,得到致密且晶粒细小的FeAl/Al2O3块体复合材料.研究表明,在w(球)∶w(粉)=13∶1、转速170 r/min、球磨时间25 h的球磨参数下,粉体中的纳米级Al2O3颗粒,在细化和活化Fe、Al金属粉末的同时,还能有效地阻止金属粉末在烧结前合金化生成金属间化合物.在烧结压力40 MPa、烧结温度1050℃、加热时间15 min、保温时间10min的烧结参数下,制备的FeAl/Al2O3复合材料的致密度可达96.4%.

With mechanical activation- spark plasma sintering methods, dense and small-grain FeAl/Al2O3 bulk composite materials is rapidly sintered from mechanical-activated Fe-Al-Al2O3 powder. This research shows that, with the ball-milling parameters of ball/powder ratio at 13.1, milling speed at 170 rpm and milling time at 25 h, nano-Al2O3 powder in （Fe-40at. %Al）-10wt.%Al2O3 not only activates Fe and Al metal powders, but also effectively prevents the mechanical alloying from becoming intermetallic before sintering. With the sintering parameters of sintering press at 40 MPa, sintering temperature at 1050 ℃, heating time at 15 min and holding time at 5 min, the density of FeAl/Al2O3 bulk composite material sintered is up to 96.4 %.