机械合金化制备纳米ZrB_2-TiB_2复合粉末（英文）  

ZrB_2-TiB_2 Nanocomposite Powder Prepared by Mechanical Alloying

作　　者：罗平[1,2] 董仕节[1,2] 杨李安卓 孙世烜[3] 谢志雄[2] 郑重[2] 杨巍[2] 

机构地区：[1]华中科技大学,湖北武汉430074 [2]湖北工业大学湖北省绿色轻工材料重点实验室,湖北武汉430068 [3]首都航天机械公司,北京100076

出　　处：《稀有金属材料与工程》2016年第6期1381-1385,共5页Rare Metal Materials and Engineering

基　　金：National Natural Science Foundation of China(51375150,51205114);Academic Leaders Project of the Wuhan Science and Technology Bureau(201271130448);the Hubei Provincial Natural Science Foundation of China(2013CFB018)

摘　　要：采用Zr、Ti、B为原料(摩尔比:1:1:4),在氩气气氛保护下,采用机械合金化方式,在球料比10:1、球磨转速500 r/min实验条件下制备了纳米结构的ZrB_2-TiB_2。采用X射线衍射仪(XRD)、场发射扫描电镜(FESEM),透射电镜(TEM)仪器,对不同球磨时间粉末的相组成、微观结构进行了表征。结果发现,原始粉末经120 h球磨后,粉末主要由ZrB_2和TiB_2组成,平均尺寸在20 nm左右,TiB_2分布于ZrB_2基体上。文章还探讨了该体系获得目标产物的机械合金化机制。Diborides, including zirconium diboride（ZrB_2） and titanium diboride（TiB_2）, have a number of desirable ceramic qualities that make suitable for preparing ceramic-matrix composites. However, synthesizing a composite based on these materials usually requires high temperatures and complex synthetic methods. In the present study, a nanocrystalline ZrB_2-Ti B_2 powder was synthesized via mechanical alloying（MA） of the mixture of elemental Zr, Ti, and B powders mixed at a Zr/Ti/B mole ratio of 1：1：4, a 10：1 ball-to-powder weight ratio and 500 r/min rotational speed in a planetary ball-mill under argon atmosphere using a ZrO_2 vial and balls. The effect of milling time on the phase change was investigated by X-ray diffraction（XRD）, and the microstructure evolution of the powder mixture was monitored by field emission scanning electron microscopy（FESEM） and transmission electron microscopy（TEM）. It is found that after 120 h of milling, a nanoscale composite powder with -20 nm mean particle size can be obtained. Moreover, TEM examination clearly shows the composite powder is composed of the nanoscale TiB_2 and ZrB_2 particles. Finally, the milling mechanism was discussed.

关 键 词：二硼化锆-二硼化钛 纳米复合材料 机械合金化 

分 类 号：TF123.74[冶金工程—粉末冶金]