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首页> 外文会议>Asian Thermal Spray Conference >Hot corrosion behavior of gas tunnel type plasma sprayed functionally graded YSZ/La_2Zr_2O_7 composite coatings in molten Na_2SO_4+V_2O_5 salt environment
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Hot corrosion behavior of gas tunnel type plasma sprayed functionally graded YSZ/La_2Zr_2O_7 composite coatings in molten Na_2SO_4+V_2O_5 salt environment

机译：气体隧道型等离子体的热腐蚀行为在熔融NA_2SO_4 + V_2O_5盐环境中喷涂功能梯度ysz / LA_2ZR_2O_7复合涂层

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摘要

Functionally graded four layer YSZ/La_2Zr_2O_7 composite coatings composed of CoNiCrAlY bond coat were prepared over SS304 substrates by using gas tunnel type plasma spraying torch at optimum spraying conditions. The experiment was performed to evaluate the hot corrosion behavior of graded coatings in 60 wt.%Na_2SO_4 + 40 wt.%V_2O_5 molten salt environment at 1000°C. X-ray diffraction, scanning electron microscopy and energy dispersive spectroscopy techniques were used to determine the nature of phases formed and to carry out microanalysis of the hot corroded coatings respectively. Results indicated that LaVO_4 and YVO_4 are the main corrosive products along with the ZrO_2 phase transformation from tetragonal to monoclinic phases in La_2Zr_2O_7 and YSZ coating layers respectively. Formation and penetration of molten NaVO_3 across the graded coating microstructure produces different kinds of corrosive products in different microstructures with respect to the presence of La_2O_3 and Y_2O_3 content. After 60 h in hot environment, the graded top layers completely peel from the bond coat surface, which limit the hot corrosion resistance ability of the functionally graded coatings.
机译：通过在最佳喷涂条件下使用气体隧道型等离子体喷射炬在SS304基板上制备由同胞粘连涂层组成的功能梯度的四层YSZ / LA_2ZR_2O_7复合涂层。进行实验以评估60重量％的渐变涂层的热腐蚀行为。％Na_2SO_4 + 40重量％V_2O_5熔盐环境1000℃。 X射线衍射，扫描电子显微镜和能量分散光谱技术用于确定分别形成的阶段的各相的性质和进行热腐蚀涂层的微分析。结果表明，Lavo_4和YVO_4分别是主要腐蚀性产品以及SA_2ZR_2O_7和YSZ涂层中的四边形到单斜相的ZRO_2相变。在分级涂层微观结构上形成和渗透熔融Nabo_3在不同微结构中产生不同种类的腐蚀性产物，相对于La_2O_3和Y_2O_3含量的存在。在热环境中60小时后，渐变顶层完全从粘合涂层表面剥离，这限制了功能梯度涂层的热腐蚀性能力。

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