In the combustion chambers of gas turbine engines, ZrO2-8wt.%Y2O3 (YSZ) TBCs are commonly applied by air plasma spray (APS) using Ar-/H2-based plasmas via legacy torches. Alternatively, N2/H2 plasmas could be used with the potential of increasing overall deposition efficiency (DE) and hence reduce the consumption of high-value feedstock powder. Also, by increasing DE, spraying time would be reduced, thereby providing another contribution to bring down production costs. In this work, TBCs were prepared with Ar- and N2-based plasmas with different YSZ powders using Metco 9MB legacy torch. The use of N2-based plasma resulted in higher particle temperature and lower particle velocity values than those provided by the Ar-based plasma. The measured DEs were between 41-43 and 53-60% for the Ar- and N2-based plasmas, respectively. This represents a ~ 40% increase in the DE. The coatings produced with the two different plasmas exhibited equivalent porosity levels ~ 11-13%. On average, the lowest thermal conductivity values were given by a N2-based LD-B YSZ TBC. In the furnace cycle test, the performance of the TBCs prepared with the N2-based plasma was superior to that of the TBCs prepared with the Ar plasma, and also exceeding that of an industrial APS TBC benchmark.

中文翻译：

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等离子体成分对氧化钇稳定氧化锆 (8YSZ) 热障涂层 (TBC) 热循环性能的影响


在燃气轮机发动机的燃烧室中，ZrO2-8wt.%Y2O3 (YSZ) TBC 通常通过传统火炬使用 Ar-/H2 基等离子体通过空气等离子喷涂 (APS) 进行涂覆。或者，可以使用 N2/H2 等离子体来提高总体沉积效率 (DE)，从而减少高价值原料粉末的消耗。此外，通过增加DE，可以减少喷涂时间，从而为降低生产成本提供另一个贡献。在这项工作中，使用 Metco 9MB 传统炬管，使用基于 Ar 和 N2 的等离子体以及不同的 YSZ 粉末制备 TBC。与基于 Ar 的等离子体相比，使用基于 N2 的等离子体会产生更高的颗粒温度和更低的颗粒速度值。对于 Ar 基和 N2 基等离子体，测得的 DE 分别在 41-43% 和 53-60% 之间。这代表 DE 增加了约 40%。用两种不同等离子体生产的涂层表现出等效的孔隙率水平~11-13%。平均而言，基于 N2 的 LD-B YSZ TBC 给出了最低的导热率值。在炉循环测试中，N2基等离子体制备的TBC性能优于Ar等离子体制备的TBC，也超过了工业APS TBC基准。