富铝Fe-Al粉末的热压烧结工艺及组织研究  

Investigation on preparative technology and microstructure of Fe-Al mixture with rich aluminum by hot-pressing sintering

作　　者：李强[1,2] 姜春兰[1] 杜烨[3] 

机构地区：[1]北京理工大学爆炸科学与技术国家重点实验室 [2]中国人民解放军96528部队 [3]中北大学弹箭模拟仿真研究中心

出　　处：《功能材料》2014年第20期20138-20141,共4页Journal of Functional Materials

基　　金：国防基础科研计划资助项目(A2220110003);兵总预研资助项目(00404010302)

摘　　要：以富铝Fe-Al粉末为原料采用热压烧结工艺制备了铁-铝合金试样,运用X射线衍射仪(XRD)和能谱仪(EDS)对试样在不同烧结压力和温度条件下形成的金属间化合物成分进行了分析,通过扫描电镜(SEM)研究了不同烧结产物的组织形貌。结果表明,10 MPa压力下固态扩散生成Fe2Al5的临界温度为550℃,随着压力提高到20 MPa,该温度下转而生成FeAl3;烧结过程中随着压力升高富铝化合物会对铁单质形成包裹,成为扩散阻隔层;为了保持铁铝烧结体的含能特性,烧结温度和压力应分别控制在600℃和10 MPa。研究成果为热压烧结富铝Fe-Al粉末提供了理论依据及加工工艺参考。Hot-pressing sintering process was performed on Fe-Al mixture to fabricate alloy specimens.Intermetallic compounds sintered with different pressure and temperatures were analyzed by X-ray diffraction（XRD） and energy disperse spectroscopy（EDS）,and the microstructure was investigated with scanning electron microscopy（SEM）.The results show that the critical temperature which compounded Fe2Al5 in pressure of 10 MPa was 550 ℃,and the product was FeAl3 instead with pressure of 20 MPa.The simple substance iron could be coated gradually by compounds of rich aluminum with the increase of pressure,which obstructed the diffusion.For keeping the energetic feature of sintering body,the sintering temperature and pressure should be controlled at 600 ℃ and 10 MPa.The study results provided a reference for processing Fe-Al mixture with rich aluminum by hot-pressing sintering.

关 键 词：热压烧结 铁铝混粉 富铝化合物 扩散反应 

分 类 号：TG113[金属学及工艺—物理冶金]