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首页> 外文会议>2003 International Thermal Spray Conference Vol.2; May 5-8, 2003; Orlando, Florida, USA >Hot Corrosion Behavior of Graded Thermal Barrier Coatings Formed by Plasma Spraying Process
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Hot Corrosion Behavior of Graded Thermal Barrier Coatings Formed by Plasma Spraying Process

机译：等离子喷涂工艺形成的梯度热障涂层的热腐蚀行为

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Hot corrosion behavior of Thermal Barrier Coatings (TBCs) has been studied by comparison between double layer coatings and graded coatings. Two types of oxide ceramics, 8 mass % Y_2O_3-ZrO_2(8YZ) and 2CaOSiO_2-15mass% CaOZrO_2 (C_2S-15 CZ), with a bond coating of NiCrAlY were applied to metallic substrates in this study. After a hot corrosion test by V_2O_5-Na_2SO_4 corrosive ashes, hot corrosion behavior of TBC has been investigated by visual inspection, metallography, X-ray diffraction and EPMA. The C_2S-15%CZ coating reacted with V_2O_5 only where it was in direct contact with the material. The affected area from the reaction was limited to the coating surface where V_2O_5 existed. The coating showed adequate hot corrosion-resistance. It was found on the 8YZ coating that Y_2O_3, the stabilizing component, particularly reacts with V_2O_5 and loses its function; this led to partial spalling of the coating. It was observed that the durability of the double layer TBC was largely influenced by the performance of a corrosion resistant NiCrAlY undercoat which provided protection against corrosive components penetrating through the ceramic topcoat. It was observed that the graded coating degraded due to oxidation of NiCrAlY particles which independently existed near the coating surface and affected the durability of TBC.
机译：通过对双层涂层和渐变涂层之间的比较，研究了热障涂层（TBC）的热腐蚀行为。在本研究中，将两种具有NiCrAlY粘结涂层的氧化物陶瓷，分别为8质量％的Y_2O_3-ZrO_2（8YZ）和2CaOSiO_2-15质量％的CaOZrO_2（C_2S-15 CZ）应用于金属基材。通过V_2O_5-Na_2SO_4腐蚀性灰烬的热腐蚀试验后，通过目测，金相，X射线衍射和EPMA研究了TBC的热腐蚀行为。 C_2S-15％CZ涂层仅在与材料直接接触的情况下才与V_2O_5反应。反应的影响区域限于存在V_2O_5的涂层表面。涂层显示出足够的耐热腐蚀性。发现在8YZ涂层上，稳定成分Y_2O_3特别与V_2O_5反应并失去其功能。这导致涂层部分剥落。观察到双层TBC的耐久性在很大程度上受到耐腐蚀的NiCrAlY底涂层的性能的影响，该NiCrAlY底涂层提供保护以防腐蚀成分渗透穿过陶瓷面涂层。观察到梯度涂层由于NiCrAlY颗粒的氧化而退化，该NiCrAlY颗粒独立地存在于涂层表面附近并影响TBC的耐久性。

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