J Mater Sci Technol ›› 2007, Vol. 23 ›› Issue (06): 721-746.

• Research Articles •     Next Articles

Synthesis, Microstructure, and Property of Cr2AlC

Zhijun LIN, Yanchun ZHOU, Meishuan LI   

  1. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China...
  • Received:2007-08-28 Revised:2007-08-28 Online:2007-11-28 Published:2009-10-10
  • Contact: Yanchun ZHOU

Abstract: Cr2AlC is an unusual layered ternary ceramic that combines the merits of both metals and ceramics. The salient properties of Cr2AlC are strongly related to its bonding characteristics and microstructures. Synthesis, microstructure, and property of Cr2AlC are reviewed in this paper. First, theoretical calculations and physical properties are introduced. Then, the processing of Cr2AlC ceramic in both bulk form and thin films and their basic mechanical properties are summarized. Atomic-scale characterizations of Cr2AlC, as well as the microstructural relationships among Cr2AlC, Al8Cr5, and AlCr2 were achieved using a series of transmission electron microscopy (TEM) techniques. Moreover, high-temperature oxidation and hot corrosion behaviors of Cr2AlC 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 Cr2AlC is discussed based on systematic microstructural analyses. Finally, concise conclusions are drawn.

Key words: Cr2AlC, First principles calculation, Synthesis, TEM, High-temperature oxidation, Hot corrosion