纳米复合陶瓷材料强韧化的研究进展

Study Progress of the Toughening and Strenghening Mechanisms of Ceramic Nanocomposites

与传统陶瓷材料相比，纳米复合陶瓷材料断裂强度和断裂韧性得到了显著的提高。综述了纳米复合陶瓷材料强韧化机理的研究进展，主要包括弥散细化、混晶型结构强化、钉扎理论、残余应力场理论等。断裂模式从以传统复合陶瓷的以沿晶断裂为主转变为纳米复合陶瓷的以穿晶断裂为主，从而将导致断裂韧性和抗弯强度极大的提高。

The fracture toughness and strength of ceramic nanocomposite are comparatively higher than those of the conventional ones. The research progress of toughening and strenghening mechanisms of ceramic nanocomposite is elaborated in the following contents. The existing theoretics of toughening have been mainly divided into the following four types： dispersion refinement, dulplex grain structure, nailing theory and residual stresses. The transformation from intergranular fracture model to the transcrystalline fracture will greatly improve the fracture toughness and bend strength of ceramic nanocomposites.