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热喷涂技术:2024,16(1):100-108
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二硅化钼改性硅酸镱环境障涂层的高温抗氧化行为及机理
梁锐辉1, 钟鑫1, 洪督1, 赵芳霞2, 牛亚然1, 张振忠2, 郑学斌1
(1.中国科学院上海硅酸盐研究所;2.南京工业大学 材料科学与工程学院)
High-temperature antioxidant behavior and mechanism of ytterbium silicate environmental barrier coatings modified by MoSi2
Liang Ruihui1, Zhong Xin1, Hong Du1, Zhao Fangxia2, Niu Yaran1, Zhang Zhenzhong2, Zheng Xuebin1
(1.Shanghai Institute of Ceramics,Chinese Academy of Sciences;2.College of Materials Science and Engineering,Nanjing Tech University)
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投稿时间:2024-04-03    修订日期:2024-05-08
中文摘要: 新一代高推重比航空发动机的发展对环境障涂层(EBCs)的服役寿命和温度提出了苛刻的要求。稀土硅酸盐作为EBCs材料应用于面层,在服役过程中易产生纵向裂纹,为腐蚀性介质的侵蚀提供通道,严重影响EBCs的寿命。二硅化钼(MoSi2)具有优异的高温性能,有望改善稀土硅酸盐 EBCs体系的高温性能。本工作中采用MoSi2改性Yb2SiO5面层,通过真空等离子喷涂技术(VPS)分别制备了Yb2SiO5-XMoSi2(X=0,5和10vol.%)为面层,Yb2Si2O7为中间层,Si为粘结层的三种环境障涂层体系。研究了涂层在1350 ℃长时间氧化前后显微结构演化过程。结果发现,掺杂MoSi2涂层体系在高温氧化500 h后仍能保持结构完整且面层裂纹减少。原因在于,MoSi2可消耗氧化剂,减缓涂层内部TGO的增长速率,反应产物Yb2Si2O7与中间层成分一致,具有较好的化学相容性,有效改善了涂层体系的高温性能。
Abstract:The development of new generation of high thrust-to-weight ratio aero-engines places severe demands on the service life and temperature of environmental barrier coatings (EBCs). As a material for EBCs, rare-earth silicate applied to the surface layer is prone to longitudinal cracks during service, providing channels for corrosive media to invade and seriously affecting the lifespan of EBCs. MoSi2 has excellent high-temperature properties and is expected to improve the high-temperature stability of rare-earth silicate EBC systems. In this work, MoSi2 was used to modify the Yb2SiO5 top layer, and three types of EBC systems were prepared by vacuum plasma spraying (VPS), with Yb2SiO5-XMoSi2 (X=0, 5 and 10vol.%) as the top layer, Yb2Si2O7 as the intermediate layer, and Si as the bonding layer. The microstructural evolution of the coatings before and after long-term oxidation at 1350 ℃ was studied. The results showed that the MoSi2-doped coating system maintained structural integrity with reduced cracks in the top layer after high-temperature oxidation for 500 h. MoSi2 can consume the oxidizer and slow down the growth rate of TGO inside the coating. The reaction product Yb2Si2O7 was consistent with the composition of the intermediate layer, which had better chemical compatibility and effectively improved the high-temperature performance of the coating system.
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基金项目:国家自然科学基,国家自然科学基金项目(面上项目,重点项目,重大项目)
引用文本:
梁锐辉,钟鑫,洪督,赵芳霞,牛亚然,张振忠,郑学斌.二硅化钼改性硅酸镱环境障涂层的高温抗氧化行为及机理[J].热喷涂技术,2024,16(1):100-108.
Liang Ruihui,Zhong Xin,Hong Du,Zhao Fangxia,Niu Yaran,Zhang Zhenzhong,Zheng Xuebin.High-temperature antioxidant behavior and mechanism of ytterbium silicate environmental barrier coatings modified by MoSi2[J].Thermal Spray Technology,202416(1):100-108.

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