The effect of an NiAl microcrystalline coating prepared by magnetron sputtering on the high-temperature oxidation behavior of NiAl-28Cr-5Mo-1Hf was investigated in static air at 1000-1150degreesC. The additions of Cr, Mo, and Hf changed the single beta-phase structure into a multiphase structure [beta-NiAl, alpha-Cr(Mo), and Heusler phase]. The NiAl-28Cr-5Mo-1Hf alloy formed a nonprotective mixed scale of Al2O3 + Cr2O3 + HfO2 and exhibited relatively large weight gains. The large weight gains were attributed to extensive internal oxidation. The sputtered NiAl microcrystalline coating remarkably improved the oxidation resistance of NiAl-28Cr-5Mo-1Hf due to the formation of a compact and adherent Al2O3 scale at all test temperatures. It was found that the theta- alpha-Al2O3 transformation caused the anomalous behavior of the oxidation-kinetics cures of the NiAl microcrystalline coating in the temperature range 1000-1150degreesC. A change in the morphology of scales occurred with the transformation.
部门归属
chinese acad sci, inst met res, shenyang 110016, peoples r china.;guo, jt (reprint author), chinese acad sci, inst met res, 72 whenhua rd, shenyang 110016, peoples r china
J. T. Guo,C. M. Xu. Effect of NiAl microcrystalline coating on the high-temperature oxidation behavior of NiAl-28Cr-5Mo-1Hf[J]. Oxidation of Metals,2002,58(5-6):457-468.
APA
J. T. Guo,&C. M. Xu.(2002).Effect of NiAl microcrystalline coating on the high-temperature oxidation behavior of NiAl-28Cr-5Mo-1Hf.Oxidation of Metals,58(5-6),457-468.
MLA
J. T. Guo,et al."Effect of NiAl microcrystalline coating on the high-temperature oxidation behavior of NiAl-28Cr-5Mo-1Hf".Oxidation of Metals 58.5-6(2002):457-468.
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