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Effect of surface morphology of MCrAlY bond coats on the isothermal oxidation behavior

机译：MCrAlY粘结涂层的表面形态对等温氧化行为的影响

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摘要

Surface morphology of MCrAlY bond coats is one of the factors that affect the oxidation behavior and the thermal stability of thermal barrier coatings. In the present study, the isothermal oxidation behavior of cold sprayed MCrAlY bond coat was investigated at three surface conditions: as-sprayed, polished and shot-peenned conditions. The MCrAlY bond coat with sputters adhered weakly on the surface prepared by low-pressure plasma spraying was also employed. The above four types of surface conditions were employed to investigate the effect of the surface morphologies of MCrAlY (M=NiCo, Ni) bond coats on their oxidation behavior. MCrAlYs with the compositions of Ni_(20)Cr_(10)AlY and Ni_(23)Co_(20)Cr_(8.5)Al_(5.0)Ta_(0.6)Y were employed for bond coat deposition. Cold-sprayed Ni(20)Cr_(10)AlY exhibited a higher oxidation rate than that of the cold-sprayed Ni_(23)Co_(20)Cr_(8.5)Al_(5.0)Ta_(0.6)Y bond coats. After 10 hrs oxidation, the TGO on the as-cold-sprayed bond coat surface was merely constituted by Al_2O_3, while the TGO on the bond coat surface attached with sputters was composed of Al_2O_3 and spinel. After 500 hrs oxidation, Cr_2O_3 and porous spinel appeared in the TGO on the two surfaces of as-cold-sprayed bond coat. The growth of Ni/Cr-oxides was attributed to the Al depletion. The content of spinel on cold-sprayed NiCrAlY decreased after shot-peenning.
机译：MCrAlY粘结涂层的表面形态是影响热障涂层氧化性能和热稳定性的因素之一。在本研究中，研究了冷喷涂MCrAlY粘结涂层在三种表面条件下的等温氧化行为：喷涂，抛光和喷丸条件。还使用了在低压等离子体喷涂制备的表面上微弱附着有溅射物的MCrAlY粘结涂层。以上四种类型的表面条件被用来研究MCrAlY（M = NiCo，Ni）粘结涂层的表面形态对其氧化行为的影响。将具有Ni_（20）Cr_（10）AlY和Ni_（23）Co_（20）Cr_（8.5）Al_（5.0）Ta_（0.6）Y组成的MCrAlYs用于粘结涂层沉积。冷喷涂的Ni（20）Cr_（10）AlY的氧化速率高于冷喷涂的Ni_（23）Co_（20）Cr_（8.5）Al_（5.0）Ta_（0.6）Y粘结层。氧化10小时后，冷喷涂的结合层表面上的TGO仅由Al_2O_3构成，而附着有溅射层的结合层表面上的TGO由Al_2O_3和尖晶石组成。氧化500小时后，冷喷涂的粘结层两个表面的TGO中都出现了Cr_2O_3和多孔尖晶石。 Ni / Cr氧化物的生长归因于Al的耗尽。喷丸后冷喷涂NiCrAlY上的尖晶石含量降低。

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