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首页> 外文期刊>Journal of Materials Engineering and Performance >Microstructures and Properties of Laser-Glazed Plasma-Sprayed ZrO_2-YO_(1.5)/Ni-22Cr-10Al-l Y Thermal Barrier Coatings
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Microstructures and Properties of Laser-Glazed Plasma-Sprayed ZrO_2-YO_(1.5)/Ni-22Cr-10Al-l Y Thermal Barrier Coatings

机译：激光釉等离子喷涂ZrO_2-YO_（1.5）/ Ni-22Cr-10Al-1Y热障涂层的组织与性能

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摘要

Thermal barrier coatings (TBCs) consisting of two layers with various yttria contents (ZrCO_2-YO_(1.5)/Ni-22Cr-liAI-lY) were plasma sprayed, and parts of the various specimens were glazed by using a pulsed CO_2 laser. All the specimens were then subjected to furnace thermal cycling tests at 1100 deg C; the effect of laser glazing on the durability and failure mechanism of the TBCs was then evaluated. From these results, two models were developed to show the failure mechanism of as-sprayed and laser-glazed TBCs: model A, which is thermal-stress dominant, and model V, which is oxidation-stress dominant. For top coats containing cubic phase, cubic and monoclinic phases, or tetragonal and a relatively larger amount of mono-clinic phases, whose degradation is thermal-stress dominant, laser glazing improved the durability of TBCs by a factor of about two to six. Segmented cracks that occurred during glazing proved beneficial for accommodating thermal stress and raising the tolerance to oxidation, which resulted in a higher durability. Thermal barrier coatings with top coats containing tetragonal phase had the highest durability. Degradation of such TBCs resulted mainly from oxidation of the bond coats. For top coats with a greater amount of monoclinic phase, thermal mismatch stress occurred during cooling and detrimentally affected durability.
机译：等离子喷涂由氧化钇含量不同的两层（ZrCO_2-YO_（1.5）/ Ni-22Cr-liAl-1Y）组成的热障涂层（TBC），并使用脉冲CO_2激光给各种样品的一部分上釉。然后将所有样品在1100℃下进行炉子热循环测试;然后评估了激光玻璃对TBC的耐久性和破坏机理的影响。根据这些结果，开发了两个模型来显示喷涂的和激光上光的TBC的失效机理：模型A（以热应力为主）和模型V（以氧化应力为主）。对于包含立方相，立方相和单斜晶相或四方相和相对大量的单斜晶相的面漆，其降解主要是热应力，激光玻璃将TBC的耐久性提高了约2到6倍。经证明，在玻璃上发生的分段裂纹有利于适应热应力并提高抗氧化性，从而提高了耐久性。具有包含四方相的面涂层的隔热涂层具有最高的耐久性。这种TBC的降解主要是由粘结层的氧化引起的。对于具有更大单斜晶相量的面漆，在冷却过程中会发生热失配应力，并且对耐久性产生不利影响。

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