Mo_5Si_3-Al_2O_3复合材料的制备及抗氧化性能研究  

Study on preparation and oxidation properties of Mo_5Si_3-Al_2O_3 composites

作　　者：张红霞[1] 陈莉[1] 陈辉[2] 

机构地区：[1]新乡职业技术学院材料工程系,河南新乡453006 [2]聊城大学材料科学与工程学院,山东聊城252000

出　　处：《粉末冶金工业》2016年第3期55-59,共5页Powder Metallurgy Industry

基　　金：山东省自然科学基金资助项目(BS2015CL007);聊城大学博士启动基金资助项目(31805)

摘　　要：采用机械化学还原法结合热压烧结制备了Mo_5Si_3-Al_2O_3复合材料,并对复合材料在600℃下的氧化行为进行了研究。结果表明:以MoO_3粉、Mo粉、Si粉和Al粉为原料,机械球磨10h,可获得具有纳米晶结构的Mo_5Si_3-Al_2O_3复合粉体;相比纯Mo5Si3试样,Mo_5Si_3-Al_2O_3复合材料的烧结相对密度和硬度提高,分别达97.2%和1350HV;Al_2O_3的引入可有效防止Mo_5Si_3的低温"粉化"现象,使Mo_5Si_3-Al_2O_3复合材料的抗氧化性明显提高,其氧化动力学曲线呈近似抛物线规律。Mo5Si3-Al2O3 composite was prepared by mechano-chemical reduction method and consolidated by hot pressing. The oxidation behavior of the composites at 600 ℃ was investigated. The results show that nano-scale Mo5Si3-Al2O3 composite is synthesized with MoO3,Mo,Si and Al powders as starting materials by mechanical milling for 10 h. The relative density and hardness of the Mo5Si3-Al2O3 composite reach 97.2%and 1 350 HV,re-spectively,higher than pure Mo5Si3. The addition of Al2O3 in the Mo5Si3 can effectively restrain its pest oxidation. Compared with Mo5Si3 alloy,the oxidation resistances of Mo5Si3-Al2O3 composite is remarkably improved and the oxidation behavior of the composite exhibits a similar parabolic law.

关 键 词：Mo5Si3-Al2O3 机械合金化 复合材料 氧化行为 

分 类 号：TF125[冶金工程—粉末冶金]