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首页> 外文会议>ASME Turbo Expo: Turbomachinery Technical Conference and Exposition >RARE-EARTH OXIDES BLENDED WITH YTTRIA-STABILIZED ZIRCONIA THERMAL BARRIER COATINGS FOR IMPROVED RESISTANCE TO SAND ADHERENCE AND CALCIA-MAGNESIA-ALUMINO-SILICATE (CMAS) INFILTRATION
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RARE-EARTH OXIDES BLENDED WITH YTTRIA-STABILIZED ZIRCONIA THERMAL BARRIER COATINGS FOR IMPROVED RESISTANCE TO SAND ADHERENCE AND CALCIA-MAGNESIA-ALUMINO-SILICATE (CMAS) INFILTRATION

机译：掺有钇稳定氧化锆热障涂层的稀土氧化物，可提高耐砂性和钙硅镁铝硅酸盐（CMAS）渗透性

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Military rotorcraft are particularly susceptible to engine damage from environmental particulates. While inertial particle separators are efficient at removing large particles, fine particulates (75 μm or smaller) are still entering the engine. Once into the hot-section, these fine particulates melt, impinge the hot-section components, and solidify as calcia-magnesia-alumina-silicate (CMAS) glasses. Infiltration from these glassy deposits can significantly reduce component lifetimes through the loss of strain tolerance and increased thermal conductivity within the thermal barrier coatings (TBCs) protecting the underlying substrates. Engine life knockdowns can lead to significant increases in the operations and sustainment costs of military aviation assets. In addition, the adhesion and build-up of the glassy CMAS deposit on hot-section components can lead to rapid performance degradation, which has resulted in the loss of aircraft and loss of life incidents during military operations in particle-laden environments. The Army Research Laboratory (ARL) is working to develop sandphobic coatings that are resistance to molten sand adhesion and the buildup of glassy CMAS deposits. To this end, this paper/presentation will focus on recent results from blending rare-earth oxides (REO) with yttria-stabilized zirconia thermal barrier coatings. Gadolinia powder was mixed with eight (8) weight percent yttria-stabilized zirconia (8YSZ) powder for consolidation via air plasma spray onto Inconel 718 discs (1-in diameter) and tested in the Hot Particulate Ingestion Rig (HPIR) under engine-relevant conditions, using AFRL-02 synthetic sand. The as-processed and tested samples were characterized using optical microscopy (OM) and scanning electron microscopy (SEM) coupled with energy dispersive X-ray spectroscopy (EDS). Preliminary results show that mixing REOs with 8YSZ can significantly reduce molten sand adhesion compared to pure 8YSZ.
机译：军用旋翼飞机特别容易受到环境颗粒物对发动机的损害。尽管惯性颗粒分离器可有效去除大颗粒，但细颗粒（75μm或更小）仍进入发动机。一旦进入热区，这些细小颗粒就会熔化，撞击热区成分，并固化为氧化钙-镁铝-硅酸盐（CMAS）玻璃。这些玻璃状沉积物的渗入可通过降低应变容限和增加热障涂层（TBC）中的热导率来大大缩短组件寿命，从而保护下面的基材。降低发动机寿命可能导致军用航空资产的运营和维护成本大幅增加。此外，玻璃状CMAS沉积物在热区部件上的附着和堆积会导致性能快速下降，从而导致飞机的损失以及在充满粒子的环境中进行军事行动期间的生命事件的损失。陆军研究实验室（ARL）致力于开发耐沙尘涂层，该涂层可抵抗熔融沙子的粘附和玻璃状CMAS沉积物的堆积。为此，本文/演讲将集中在将稀土氧化物（REO）与氧化钇稳定的氧化锆热障涂层混合中得到的最新结果。将d粉与八（8）重量百分比的氧化钇稳定的氧化锆（8YSZ）粉末混合，通过空气等离子喷涂固结到Inconel 718圆盘上（直径1），并在与发动机相关的热颗粒进气装置（HPIR）中进行测试条件下，使用AFRL-02合成砂。使用光学显微镜（OM）和扫描电子显微镜（SEM）结合能量色散X射线光谱（EDS）对经过处理和测试的样品进行表征。初步结果表明，与纯8YSZ相比，将REO与8YSZ混合可以显着降低熔融砂的附着力。

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