Thermal barrier coating life and isothermal oxidation of low-pressure plasma-sprayed bond coat alloys
Thermal barrier coating life and isothermal oxidation of low-pressure plasma-sprayed bond coat alloys
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DOI：
10.1016/0257-8972(90)90096-u
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发表时间：
1990-12
影响因子：
5.4
通讯作者：
W. Brindley;R. A. Miller
中科院分区：
文献类型：
--
作者：
W. Brindley;R. A. Miller
本文研究了低压等离子喷涂Ni-35 Cr-6Al-0.95Y、Ni-18 Cr-12 Al-0.3Y和Ni-16 Cr-6Al-0.3Y（重量百分比）合金的等温氧化动力学，并考察了这些合金对热障涂层（TBC）循环寿命的影响。TBC寿命通过循环涂覆有不同粘结涂层和ZrO 2 - 7 wt.%的涂层的基材来检查。在1150 °C和室温之间的富空气燃烧器装置火焰中的Y2 O3 TBC。通过在1083 °C下对整体式NiCrAlY试样进行等温氧化来检查三种粘结涂层合金的氧化动力学。Ni-35 Cr-6Al-0.95Y合金表现出相对高的等温氧化增重，并提供最长的TBC寿命，而Ni-16 Cr-6Al-0.3Y合金具有最低的增重，并提供最低的TBC寿命。结果清楚地表明，尽管已知粘结层氧化对TBC寿命具有强烈的不利影响，但它不是决定TBC寿命的唯一粘结层因素。在Ni-35 Cr-6Al-0.95Y和Ni-18 Cr-12 Al-0.3Y合金的粘结层金属中观察到α-Cr相，而在Ni-16 Cr-6Al-0.3Y合金中没有观察到α-Cr相。α-Cr的存在可降低Ni-35 Cr-6Al-0.95Y和Ni-18 Cr-12 Al-0.3Y合金的热膨胀系数，从而相对于Ni-16 Cr-6Al-0.3Y涂层增加这些粘结涂层上的TBC寿命。
The isothermal oxidation kinetics of Ni-35Cr-6Al-0.95Y, Ni-18Cr-12Al-0.3Y and Ni-16Cr-6Al-0.3Y (composition in weight per cent) low-pressure plasma-sprayed bond coat alloys were investigated and the effect of these alloys on the thermal barrier coating (TBC) cyclic life was examined. TBC life was examined by cycling substrates coated with the different bond coats and a ZrO2-7wt.%Y2O3TBC in an air-rich burner rig flame between 1150 °C and room temperature. The oxidation kinetics of the three bond coat alloys were examined by isothermal oxidation of monolithic NiCrAlY coupons at 1083 °C. The Ni-35Cr-6Al-0.95Y alloy exhibited comparatively high isothermal oxidation weight gains and provided the longest TBC life, whereas the Ni-16Cr-6Al-0.3Y alloy had the lowest weight gains and provided the lowest TBC life. The results clearly show that, although bond coat oxidation is known to have a strong detrimental effect on TBC life, it is not the only bond coat factor that determines TBC life. The α-Cr phase was observed in the bond coat metal for the Ni-35Cr-6Al-0.95Y and Ni-18Cr-12Al-0.3Y alloys, but not for the Ni-16Cr-6Al-0.3Y alloy. The presence of α-Cr may reduce the coefficient of thermal expansion of the Ni-35Cr-6Al-0.95Y and Ni-18Cr-12Al-0.3Y alloys, thereby increasing the TBC lives on these bond coats relative to the Ni-16Cr-6Al-0.3Y coating.