Synthesis,Microstructure,and Property of Cr_2AlC

摘要

Cr_2AlC is an unusual layered ternary ceramic that combines the merits of both metals and ceramics.The salient properties of Cr_2AlC are strongly related to its bonding characteristics and microstructures.Synthesis, microstructure,and property of Cr_2AlC are reviewed in this paper.First,theoretical calculations and physical properties are introduced.Then,the processing of Cr_2AlC ceramic in both bulk form and thin films and their basic mechanical properties are summarized.Atomic-scale characterizations of Cr_2AlC,as well as the microstructural relationships among Cr_2AlC,Al_8Cr_5,and AlCr_2 were achieved using a series of transmission electron microscopy(TEM)techniques.Moreover,high-temperature oxidation and hot corrosion behaviors of Cr_2AlC were investigated by means of thermogravimetric analysis,X-ray diffraction,Raman spectroscopy, scanning electron microscopy,and TEM.Mechanism of the excellent high-temperature corrosion resistance of Cr_2AlC is discussed based on systematic microstructural analyses.Finally,concise conclusions are drawn.