等离子喷涂-物理气相沉积制备7YSZ热障涂层及其热导率研究
发布时间：2019-01-05 21:48
【摘要】：通过等离子喷涂-物理气相沉积(PS-PVD)技术在3种不同工艺参数下制备7YSZ热障涂层。采用XRD和SEM分析涂层的相结构和微观组织,利用激光脉冲法测量涂层不同温度下的热导率。结果表明:通过调整工艺参数中电流的大小和等离子气体成分,可以制备截面呈柱状、致密层状和柱-颗粒状混合组织结构,表面呈"菜花"状或起伏的多峰状的YSZ热障涂层。涂层的相结构由粉末的单斜相氧化锆(m-ZrO_2)转变为涂层中的四方相氧化锆(t-ZrO_2),并保留至室温。在700~1100℃时,YSZ涂层的热导率随着温度的升高而增大。柱状晶结构涂层因具有较大的孔隙率,可以有效降低涂层的热导率,其热导率为1.0~1.2W·m~(-1)·K~(-1);而层状结构涂层由于比较致密,其热导率相对较高。
[Abstract]:7YSZ thermal barrier coatings were prepared by plasma spraying and physical vapor deposition (PS-PVD) under three different process parameters. The phase structure and microstructure of the coating were analyzed by XRD and SEM. The thermal conductivity of the coating at different temperatures was measured by laser pulse method. The results show that by adjusting the current and plasma gas composition in the process parameters, the YSZ thermal barrier coating with columnar section, dense layer and column-granular structure can be prepared, and the surface of the coating is "cauliflower" or undulating multi-peak YSZ thermal barrier coating. The phase structure of the coating changed from monoclinic zirconia (m-ZrO_2) of powder to tetragonal zirconia (t-ZrO_2) in the coating and remained at room temperature. The thermal conductivity of YSZ coating increases with the increase of temperature at 700 鈩，
本文编号：2402351
[Abstract]:7YSZ thermal barrier coatings were prepared by plasma spraying and physical vapor deposition (PS-PVD) under three different process parameters. The phase structure and microstructure of the coating were analyzed by XRD and SEM. The thermal conductivity of the coating at different temperatures was measured by laser pulse method. The results show that by adjusting the current and plasma gas composition in the process parameters, the YSZ thermal barrier coating with columnar section, dense layer and column-granular structure can be prepared, and the surface of the coating is "cauliflower" or undulating multi-peak YSZ thermal barrier coating. The phase structure of the coating changed from monoclinic zirconia (m-ZrO_2) of powder to tetragonal zirconia (t-ZrO_2) in the coating and remained at room temperature. The thermal conductivity of YSZ coating increases with the increase of temperature at 700 鈩，
本文编号：2402351
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