测定了IC-6高温合金在900℃～1100℃的氧化动力学曲线.结 果表明：900℃，IC-6合金的氧化膜主要由α-Al2O3、NiAl2O4和NiO构成并含 有少 量的NiMoO4和MoO2.1050℃和1100℃氧化时，IC-6合金表面生成了挥发性很强的MoO3 ，发生了氧化失重.IC-6合金上沉积NiCoCrAlY涂层后，900℃时，涂层的氧化膜主要为α- Al2O3；1050℃时，氧化膜主要为α-Al2O3和Cr2O3，大大改善了合金的抗氧 化性.1100℃时，氧化膜主要由α-Al2O3、NiAl2O4和NiO构成，涂层虽然有一 定的保护 性，但效果不如900℃和1050℃时显著.形成以α-Al2O3和Cr2O3为主的氧化膜是使 合金沉积NiCoCrAlY涂层后抗氧化能力大大提高的直接原因.
NiCoCrAlY coating was deposited on a new Ni3Al-ba se alloy IC-6 using arc ion plating.The oxidation kinetic curves of alloy IC-6,N i-base alloy K17 and NiCoCrAlY coated alloy IC-6 at 900℃～1100℃ were obtained. The results indicate that exposed at 900℃,the oxide scales of alloy IC-6 consis t of α-Al2O3、NiAl2O4 and NiO.A small amount of NiMoO4 and MoO2 wer e also detected.At 1050℃ and 1100℃,lose weight occurred due to the formation o f volatile MoO3.The oxidation weight gain rate of the NiCoCrAlY coating deposi ted on alloy IC-6 o beyed the parabolic rate law at different temperatures.The coating combined with alloy IC-6 closely and no spalling and void between the coating and the interfa ce of the substrate were observed.The coating oxidation resistance remarkably im proved with α-Al2O3 scales that formed and covered on the coating at 900℃ and both α-Al2O3 and Cr2O3 scales on the coating at 1050℃.The effectiv eness of NiCoCrAlY coating was not distinctive at 1100℃ due to NiAl2O4 and NiO growing on the surface of coating.The formation of α-Al2O3 and Cr2O 3 scale is the directly reason of remarkable improvement of oxidation resistance of superalloy IC-6 covered with NiCoCrAlY coating.
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