Synthesis and thermal stability of Cr2AlC |
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| Authors: | Li-Ou XiaoShi-Bo Li Guiming SongWillem G Sloof |
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| Affiliation: | a Institute of Materials Science and Engineering, School of Mechanical and Electronic Control Engineering, Beijing Jiaotong University, Beijing 100044, China
b Department of Materials Science and Engineering, Delft University of Technology, Mekelweg 2, 2628 CD Delft, The Netherlands |
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| Abstract: | A new reaction route with AlCr2 and C as starting materials has been developed to produce Cr2AlC. A Cr2AlC bulk ceramic was achieved by hot pressing the AlCr2 and C powders at 1400 °C with 20 MPa for 1 h in Ar. The mechanism to form Cr2AlC in a temperature range of 1050-1400 °C was studied. It was confirmed that Cr2AlC is formed directly by a reaction between C and AlCr2. The reaction process, phase composition and microstructure were characterized with differential thermal analysis, X-ray diffractometry and scanning electron microscopy. The produced Cr2AlC ceramic is stable up to 1500 °C in an Ar atmosphere, but decomposes into Al8Cr5 and Cr23C6 above 1500 °C. |
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| Keywords: | Cr2AlC Carbides Hot pressing Microstructure Thermal properties |
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