Abstract
Due to the excellent oxidation and hot corrosion resistance and matched thermal expansion coefficient to normal alloys, Cr2AlC has potential applications as high-temperature protective coating. In the present work, the preparation of Cr2AlC coating has been achieved through cathodic arc deposition method combined with heat post-treatment. It was found that the coating, deposited from Cr2AlC compound target in the unintentional heating condition, was amorphous. After annealing at 620°C in Ar for 20h, the amorphous Cr–Al–C coating happened to crystallize and transformed to crystalline Cr2AlC as the major phase. It is obvious that the formation temperature of Cr2AlC was decreased from about 1050°C for sintered bulk to around 620°C for the as-deposited coating, resulting from the homogeneous mixture of the Cr, Al and C at atomic level in the Cr–Al–C coating. Apart from crystalline Cr2AlC, the annealed coating also contained AlCr2 and little Cr7C3. AlCr2 formed due to the loss of C during deposition, and little Cr7C3 always existed in the sintered Cr2AlC compound target as impurity phase.
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