Thermal stability of nanostructured 13 wt% Al2O3–8 wt% Y2O3–ZrO2 thermal barrier coatings
Thermal stability of nanostructured 13 wt% Al2O3–8 wt% Y2O3–ZrO2 thermal barrier coatings
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DOI：
10.1016/j.jeurceramsoc.2009.10.005
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发表时间：
2010-03
影响因子：
5.7
通讯作者：
Qinghe Yu;Chungen Zhou;Huiyan Zhang;F. Zhao
中科院分区：
文献类型：
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作者：
Qinghe Yu;Chungen Zhou;Huiyan Zhang;F. Zhao
采用大气等离子喷涂技术制备了13wt%Al_2O_3-8wt%Y_2O_3-ZrO_2(13AlYSZ)纳米结构涂层。利用X射线衍射仪、扫描电子显微镜和透射电子显微镜对13AlYSZ涂层的相结构和形貌进行了表征。结果表明，喷涂层主要由四方氧化锆相组成，Al元素固溶体为ZrO2。1100℃热处理使氧化锆的平均晶粒度从61 nm增加到120 nm，孔隙率从23.8%降低到18%。纳米Al_2O_3的加入能有效地抑制氧化锆相的生长。详细讨论了纳米结构8wt%Y_2O_3-ZrO_2热障涂层抑制晶粒长大的机理。
Nanostructured 13wt% Al2O3–8wt% Y2O3–ZrO2(13AlYSZ) coatings were developed by atmospheric plasma spraying (APS). The phase structure and the morphology of the 13AlYSZ coatings were characterized using X-ray diffraction (XRD), scanning electron microscope (SEM) and transmission electron microscope (TEM). It was found that the as-sprayed coatings mainly consisted of tetragonal zirconia, with the Al element solid solution in ZrO2. Heat treatment at 1100°C increased the average grain size of the ZrO2phase from 61 to 120nm and decreased the porosity from 23.8 to 18%. The addition of the nano-Al2O3can effectively inhibit the grain growth of the zirconia phase. The mechanism on inhibiting the grain growth of nanostructured 8wt% Y2O3–ZrO2thermal barrier coatings has been discussed in detail.