摘要
Effect of Y2O3-MgO addition on heterogeneous precipitation-thermal reduction synthesis and the sintering of Fe-Mo/Si3N4 powders has been investigated. It was found that the whiskers-like β-Si3N4, good wettability phases on Si3N4 surface, and high toughness Fe phase appeared in Fe-Mo/Si3N4 cermets with Y2O3-MgO additives. The results show that Y2O3-MgO additives can effectively optimize the microstructures of Fe-Mo/ Si3N4 cermets, and improve the material mechanical properties. Therefore, it indicated that Y2O3-MgO additives can be used for strengthening of eintered cermets, and the dual function of whiskers self-toughening and different metal-composition toughening can be achieved in Fe-Mo/Si3N4 cermets with Y2O3-MgO additives.
Effect of Y2O3-MgO addition on heterogeneous precipitation-thermal reduction synthesis and the sintering of Fe-Mo/Si3N4 powders has been investigated. It was found that the whiskers-like β-Si3N4, good wettability phases on Si3N4 surface, and high toughness Fe phase appeared in Fe-Mo/Si3N4 cermets with Y2O3-MgO additives. The results show that Y2O3-MgO additives can effectively optimize the microstructures of Fe-Mo/ Si3N4 cermets, and improve the material mechanical properties. Therefore, it indicated that Y2O3-MgO additives can be used for strengthening of eintered cermets, and the dual function of whiskers self-toughening and different metal-composition toughening can be achieved in Fe-Mo/Si3N4 cermets with Y2O3-MgO additives.
基金
supported by the National Natural Science Foundation of China (Nos. 51274093 and 50804016)
the Key Discipline Project Foundation of Hunan Province, China (No. 0805)
