CAJ | 학술논문

为了研究添加Al粉对自蔓延高温合成β-Mo（Si，Al）2的影响，以Si、Mo 和Al粉为原料，按照化学式Mo（Si1-xAlx）2（x分别取0、0．1、0．2、0．3、0．4，即Al取代Si物质的量依次为0、10％、20％、30％、40％）配料，采用自蔓延高温合成制备了不同Al含量的β-Mo（Si，Al）2，并利用X射线衍射仪和扫描电镜对合成产物进行了相组成和产物形貌分析。结果表明：Al的加入有利于自蔓延反应进行得更加完全，在自蔓延过程中，Al进入到MoSi2晶格中，发生 Al、Si 取代，当 Al 取代 Si 物质的量达到40％时，仍能实现 Al 的合金化，生成高温相β-Mo（Si，Al）2，并且随着Al的添加会使自蔓延合成产物的晶格发生严重变形。通过SEM观察发现：加入Al粉的合成产物形貌都呈现出小颗粒的聚集状态，且小颗粒为球形或接近等轴状，颗粒平均粒径为2～5μm，说明自蔓延合成产物的形貌继承了Mo粉的原始形貌，而与Al粉加入量没有明显关系。
위료연구첨가Al분대자만연고온합성β-Mo（Si，Al）2적영향，이Si、Mo 화Al분위원료，안조화학식Mo（Si1-xAlx）2（x분별취0、0．1、0．2、0．3、0．4，즉Al취대Si물질적량의차위0、10％、20％、30％、40％）배료，채용자만연고온합성제비료불동Al함량적β-Mo（Si，Al）2，병이용X사선연사의화소묘전경대합성산물진행료상조성화산물형모분석。결과표명：Al적가입유리우자만연반응진행득경가완전，재자만연과정중，Al진입도MoSi2정격중，발생 Al、Si 취대，당 Al 취대 Si 물질적량체도40％시，잉능실현 Al 적합금화，생성고온상β-Mo（Si，Al）2，병차수착Al적첨가회사자만연합성산물적정격발생엄중변형。통과SEM관찰발현：가입Al분적합성산물형모도정현출소과립적취집상태，차소과립위구형혹접근등축상，과립평균립경위2～5μm，설명자만연합성산물적형모계승료Mo분적원시형모，이여Al분가입량몰유명현관계。
β-Mo(Si,Al)2 with different Al additions was prepared by self-propagating high-temperature synthe-sis (SHS)using Si,Mo and Al powders as starting materials,batching according to Mo(Si1-xAlx)2 (x=0, 0.1,0.2,0.3,and 0.4,corresponding to Al substituting 0,10%,20%,30%,and 40%of Si in molar ratio,respec-tively)in order to research effect of adding Al powder on SHS ofβ-Mo(Si,Al)2.The phase composition and morphology of the synthesized compounds were investigated by XRD and SEM.It is found that,the self-prop-agation reactions are prompted by introducing Al;Al enters in MoSi2 lattice to substitute Si during the SHS process;when Al substitution reaches 40%,the alloying of Al can still be realized forming high temperatureβ-MoSi2 phase,and the lattices of synthesized compound deform seriously with the increase of Al addition. SEM analysis shows there are small particle aggregates in the synthesized compounds added with Al,and small particles are spheric or near equiaxed with 2-5 μm of average size,which means the morphology of the SHS products is similar with the original morphology of Mo powders,independent of Al addition.