矾土基Fe3Al/Al2O3复相陶瓷的制备工艺的研究

利用机械合金法制备了Fe2Al金属间化合物,并以此为增强相,以高铝矾土陶瓷为基体,采用弱还原气氛烧结,在1500℃制得Fe3Al/Al2O3复相陶瓷,研究分析了其微观结构及力学性能.结果表明,当加入质量分数4.5%的Fe3Al金属间化合物时,断裂韧性、体积密度和vickers硬度分别达到7.23MPa.m1/2、3.9...

The Study of the Technics of Fabricating the Fe_3Al/Al_2O_3 Composite Ceramics Base of Bauxite

Fe₃Al/Al₂O₃ composite ceramic were prepared by weak reducing atmosphere sintering using high bauxite cremic as matrix material and Fe₃Al intermetallic componds as strengthening phase which prepared by the methed of mechanical alloying.The Fe₃ A1/A1₂O₃composite cremic were synthesized at 1500℃,the mechanical properties and microstructure were investigated.The results show that the frature toughness、volume density and vickers-hardness of matrix creamic composite was significantly improed.When the quality score of Fe₃Al intermetallic componds reached 4.5%,the frature toughness、volume density and vickers-hardness reached 7.23MPa.m^1/2、3.95g.cm^-3 and 776MPa,respectively,which significantly increased compared with general bauxite-based Al₂O₃ ceramic.The microstructure of the fracture morphology was characterized by SEM,analysising results show that a certain amount of deflection of the existence of micro-cracks,fine grain toughen and reinforcement of intermetallic componds have contribute with the improvement of the fracture toughness of composite ceramics.