【摘要】 以α-Si3N4,Fe(NO3)3.9H2O和NH4Mo7O24.4H2O为原料,采用非均相沉淀法制备Fe2(MoO4)3/Si3N4复合粉末,采用氢气还原与热压法获得Fe-Mo/Si3N4复合粉末与烧结体,采用X线衍射仪(XRD)、电子能谱(EDS)、电镜扫描(SEM)和电镜透射(TEM)等方法对Fe-Mo/Si3N4复合粉末与烧结体物相、成分及微结构进行观察与分析。分析结果表明:Fe-Mo/Si3N4复合粉末主要成分为α-Si3N4,Mo,Si和Fe-Mo氮化物(Fe6Mo7N2和Fe3Mo3N),其中Mo颗粒长大;粒径为4~7μm的Mo5Si3大颗粒均匀镶嵌在Si3N4,Fe-Mo氮化物(Fe6Mo7N2和Fe3Mo3N)及SiO2的混合物组成的粒径为1μm左右的小颗粒之中。更多还原

【Abstract】 Fe2(MoO4)3/Si3N4 was prepared by heterogeneous precipitation-thermal reduction method using α-Si3N4,Fe(NO3)3.9H2O and NH4Mo7O24.4H2O as raw material,then through reducing by hydrogen and hot pressed,Fe-Mo/Si3N4 composite powder and its sintering body were obtained.Their phases,composition and microstructure were observed and analyzed by XRD,EDS,SEM and TEM.The results show that the Fe-Mo/Si3N4 composite powder consists of α-Si3N4,Mo,Si and Fe-Mo nitride(Fe6Mo7N2,Fe3Mo3N),in which Mo particle grows,while large Mo particles with size of 4-7 μm are embedded into those small particles composed of Si3N4 and Fe-Mo nitride(Fe6Mo7N2 and Fe3Mo3N) and SiO2 in the microcosmic fracture of Fe-Mo/Si3N4 cermet.更多还原