Yb/Y双掺杂氧化锆在熔盐腐蚀环境中的元素扩散和相变机理研究*

doi:10.11901/1005.3093.2015.313

材料研究学报

2016, Vol. 30

Issue (8): 627-633 DOI: 10.11901/1005.3093.2015.313

本期目录 | 过刊浏览

Yb/Y双掺杂氧化锆在熔盐腐蚀环境中的元素扩散和相变机理研究*

徐俊¹, 陈宏飞¹, 杨光¹, 罗宏杰¹, 高彦峰^1,²

1. 上海大学材料科学与工程学院上海 200444
2. 中国科学院上海硅酸盐研究所上海 200072

Elements Diffusion and Phase Transitions in Yb/Y Co-doped Zirconia Ceramic under Molten-salt Corrosive Environment

XU Jun¹, CHEN Hongfei^1,^**, YANG Guang¹, LUO Hongjie¹, GAO Yanfeng^1,^2,^**

1. College of Materials Science and Engineering, Shanghai University, Shanghai 200444, China
2. Shanghai Institute of Ceramics, Chinese Academy of Science, Shanghai 200072, China

引用本文:

徐俊, 陈宏飞, 杨光, 罗宏杰, 高彦峰. Yb/Y双掺杂氧化锆在熔盐腐蚀环境中的元素扩散和相变机理研究*[J]. 材料研究学报, 2016, 30(8): 627-633.
Jun XU, Hongfei CHEN, Guang YANG, Hongjie LUO, Yanfeng GAO. Elements Diffusion and Phase Transitions in Yb/Y Co-doped Zirconia Ceramic under Molten-salt Corrosive Environment[J]. Chinese Journal of Materials Research, 2016, 30(8): 627-633.

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摘要:

高温腐蚀性环境是发动机热端部件热障涂层出现机械应力失配和氧化锆晶型变化从而发生失效的主要原因之一。本文通过共沉淀-煅烧法制备了Yb/Y双掺杂氧化锆粉体, 压片烧结后进行高温熔盐(CaO-MgO-Al₂O₃-SiO₂, CMAS)腐蚀实验, 利用XRD、SEM及EDS等表征手段对腐蚀过程中元素的扩散和物相、形貌的变化进行研究。结果表明, 氧化锆晶格中的Yb在腐蚀过程中先于其他元素与CMAS反应而流失(从氧化锆晶格扩散至腐蚀剂中), 但Yb的流失能减缓Y元素的偏析, 从而稳定亚稳四方相氧化锆( $t ′$ -ZrO₂); Yb的最优掺杂量为5%, 此时腐蚀反应产生的单斜相氧化锆(m相)的含量最少。

关键词 ：材料失效与保护, 热障涂层, Yb/Y双掺杂氧化锆, 熔盐腐蚀, 扩散, 结晶相转变

Abstract：

Ingeneral,high-temperature salt-corrosion may usually induce mechanical stresses and phase transformation within ZrO₂,as the main componentof thermal barrier coatings (TBCs), therewith further cause the failure of TBCsfor hot section components of gas turbine. Yb/Y co-doped zirconia (YbYSZ) powder was synthesized by a coprecipitation-calcination method, thenYbYSZ ceramic pallets were obtained by cold pressing and subsequent sintering at high temperature. The corrosion behavior of thepallets coated with a film of powder mixture CaO-MgO-Al₂O₃-SiO₂ (CMAS) was examined in air at 1250℃ for different time intervals. The elemental diffusion and phase transformationwith YbYSZ after high-temperature corrosion wereinvestigated by XRD, SEM and EDS. The results showed that among othersthe elementYbin YbYSZ reacted preferenyially with CMAS and dissolved into the molten saltCMAS. The loss of Yb could suppressed the segragation of Y from the rest YbYSZ.Consequently, it stabilized the metastable tetragonal phase (t'-zirconia). The optimal dose of Yb is 5 mass% for the minimal yield of monoclinic ZrO₂ in the YbYSZ after corrosion test.

Key words： materials failure and protection thermal barrier coating Yb/Y co-doped zirconia molten-salt corrosion diffusion phase transition

收稿日期: 2015-05-28

基金资助:* 国家自然科学基金51402183和上海市科委基础研究重大项目12DJ1400403资助

作者简介: 本文联系人: 陈宏飞

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图1 3%Yb掺杂YSZ在1250℃不同腐蚀时间的SEM图

图2 YbYSZ被CMAS在1250℃腐蚀2 h后的SEM图, B图为A图的局部放大

表1 CMAS腐蚀YbYSZ中各区域元素含量

图3 CMAS在1250℃腐蚀YbYSZ陶瓷的过程示意图

图4 YbYSZ腐蚀产物XRD图

图5 (a)3%Yb掺杂YSZ分别腐蚀1 h、2 h、5 h后各元素含量变化; (b)不同Yb掺杂量的YSZ腐蚀5 h后各元素含量的变化

图6 不同掺杂浓度YbYSZ在1250℃腐蚀2 h后的XRD图

图7 3%YbYSZ在1250℃腐蚀不同时间的XRD图

图8 m相氧化锆相对含量与稀土掺杂元素含量及时间的关系图

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