刘琨,何文斌,白宇,马军,都金光,曹阳,明五一.玻璃沉积物对La2Ce2O7/YSZ涂层高温下热冲击性能的影响[J].表面技术,2020,49(11):262-268, 287.
LIU Kun,HE Wen-bin,BAI Yu,MA Jun,DU Jin-guang,CAO Yang,MING Wu-yi.Effect of Glass Deposits on Thermal Shock Properties of La2Ce2O7/YSZ Coatings at High Temperature[J].Surface Technology,2020,49(11):262-268, 287 |
| 玻璃沉积物对La2Ce2O7/YSZ涂层高温下热冲击性能的影响 |
| Effect of Glass Deposits on Thermal Shock Properties of La2Ce2O7/YSZ Coatings at High Temperature |
| 投稿时间：2019-12-19 修订日期：2020-05-30 |
| DOI：10.16490/j.cnki.issn.1001-3660.2020.11.030 |
| 中文关键词: 玻璃沉积物 铈酸镧 功能梯度热障涂层 双陶瓷层热障涂层 抗热冲击 |
| 英文关键词:glass deposit La2Ce2O7 functional graded thermal barrier coating double ceramic layer thermal barrier coating thermal shock resistance |
| 基金项目:河南省科技攻关项目(192102210017);2020年河南省高校科技创新团队项目(20IRTSTHN015) |
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| Author | Institution |
| LIU Kun | School of Mechanical and Electrical Engineering, Zhengzhou University of Light Industry, Zhengzhou 450002, China;School of Mechanical & Industrial Engineering, University of Toronto, Toronto M5S2E8, Canada |
| HE Wen-bin | School of Mechanical and Electrical Engineering, Zhengzhou University of Light Industry, Zhengzhou 450002, China |
| BAI Yu | School of Materials Science and Engineering, Xi¢an Jiaotong University, Xi¢an 710049, China |
| MA Jun | School of Mechanical and Electrical Engineering, Zhengzhou University of Light Industry, Zhengzhou 450002, China |
| DU Jin-guang | School of Mechanical and Electrical Engineering, Zhengzhou University of Light Industry, Zhengzhou 450002, China |
| CAO Yang | School of Mechanical and Electrical Engineering, Zhengzhou University of Light Industry, Zhengzhou 450002, China |
| MING Wu-yi | School of Mechanical and Electrical Engineering, Zhengzhou University of Light Industry, Zhengzhou 450002, China |
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| 中文摘要: |
| 目的 为了探究玻璃沉积物CMAS(CaO-MgO-Al2O3-SiO2)对新型结构热障涂层在1250 ℃下的热冲击寿命的影响，揭示热障涂层的失效行为。方法 通过火焰喷涂技术将制备的CMAS粉体均匀地沉积到铈酸镧/氧化钇部分稳定二氧化锆双陶瓷层热障涂层(LC/YSZ DCL-TBCs)和梯度热障涂层(LC/YSZ FGM-TBCs)的表面，于1250 ℃热冲击实验中进行涂层样品的抗热冲击性能及失效机理研究。利用扫描电镜(SEM)和能谱仪(EDS)追踪CMAS的位置，观察CMAS与涂层反应层的厚度与形貌。采用X射线衍射仪(XRD)测试反应层产物，并总结其失效方式。结果 高温热冲击结果显示梯度涂层的热冲击寿命(435次)远高于双陶瓷层热障涂层的寿命(229次)，约为铈酸镧/氧化锆双陶瓷层热障涂层寿命的1.9倍。铈酸镧层与梯度层都能在一定程度上阻碍CMAS渗入涂层内部，提高其CMAS腐蚀条件下的热冲击寿命。双陶瓷层热障涂层与梯度热障涂层的失效均是以层状剥落为主，剥落层主要是CMAS与LC的反应层以及反应层下的烧结层，反应层是由Ca2(LaxCe1-x)8(SiO4)6O6-4x、萤石相和MgAl2O4等难熔氧化物组成，这层致密氧化物类似于密封层，能阻止CMAS继续渗入。结论 功能梯度结构具有比双陶瓷层结构更优异的抗CMAS热冲击性能和更好的应力耐受性。 |
| 英文摘要: |
| The work aims to explore the influence of glass deposits CMAS (CaO-MgO-Al2O3-SiO2) on the thermal shock life of the new structure thermal barrier coatings (TBCs) at 1250 ℃ and reveal the failure behavior of these coatings. CMAS powder was uniformly deposited on the surface of LC double ceramic thermal barrier coating (LC/YSZ DCL-TBCs) and gradient thermal barrier coating (LC/YSZ FGM-TBCs) by flame spraying technology. The thermal shock resistance and failure mechanism of the coating samples were tested by thermal shock experiment at 1250 ℃. Scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) were used to track the location of CMAS and observe the thickness and morphology of CMAS and the reaction layer. X-ray diffractometer (XRD) was used to test the phase composition of the reaction layer and the coatings failure modes were summarized. The thermal shock results showed that the thermal shock life of the FGM-TBCs (435 times) was much higher than that of the DCL-TBCs (229 times), which was about 1.9 times longer than that of La2Ce2O7/YSZ DCL-TBCs. Both cerium lanthanum oxide layer and gradient layer could prevent CMAS from infiltrating into the coating to some extent and improve the thermal impact life under CMAS corrosion condition. The failure of two TBCs was mainly caused by layered spalling. The spalling layer were mainly the reaction layer of CMAS and LC, which generated refractory oxides such as Ca2(LaxCe1-x)8(SiO4)6O6-4x, fluorite phase and MgAl2O4, and the sintered layer under the reaction layer. This dense oxide layer was similar to the sealing layer and could prevent CMAS from further infiltration. The above results show that the FG-TBCs have better CMAS thermal shock resistance and better stress tolerance than the DCL-TBCs. |
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