引用本文:杨乐馨,李文生,安国升,张义.LZO/8YSZ双陶瓷热障涂层CMAS的腐蚀性能[J].中国表面工程,2020,33(1):91~100
Yang Lexin,Li Wensheng,An Guosheng,Zhang Yi.Corrosion Properties of LZO/ 8YSZ Double Ceramic Thermal Barrier Coatings[J].China Surface Engineering,2020,33(1):91~100
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LZO/8YSZ双陶瓷热障涂层CMAS的腐蚀性能
杨乐馨, 李文生, 安国升, 张义
兰州理工大学 有色金属先进加工与再利用国家重点实验室, 兰州 730050
摘要:
为探究 La2Zr2O7(LZO)涂层服役于 CMAS 环境中其微观结构、力学性能的变化及封阻渗透的原因,采用大气等离子制备了以 Al 2O3 为基体的 LZO/ 8YSZ 双陶瓷热障涂层( TBCs) ,并辅以 8YSZ 单陶瓷 TBCs 作对比。 利用 XRD、SEM 和 EDS 研究了 8YSZ 和 LZO/ 8YSZ 单双陶瓷 TBCs 的相结构和微观组织;利用维式硬度计和 Image Pro plus 软件研究了腐蚀后的涂层硬度及渗透深度。 结果表明:1250 ℃ CMAS 腐蚀 12 h 后,LZO/ 8YSZ 双陶瓷 TBCs 中 LZO 反应厚度约为 57 μm;反应层物相以球状 ZrO2 和棒状 Ca2La8( SiO4 ) 6O2 为主,并伴有少量 CaAl 2 Si 2O8 和 MgAl 2O4 。 而 8YSZ 单陶瓷 TBCs 腐蚀深度约为 300 μm( 整个 8YSZ 层厚) ,截面变为以球状 m-ZrO2 为主的疏松结构。 腐蚀后 8YSZ、LZO 反应层硬度均有所增加,但提高的面内刚度未引发反应/ 未反应层间开裂。 LZO 陶瓷层作为双陶瓷 TBCs 牺牲防护层,依靠 La 同 CMAS 反应生成致密磷灰石(Ca2La8( SiO4 ) 6O2 )的封阻作用,有效减少 CMAS 渗入,抑制了内部 8YSZ 的不稳定性。
关键词:  大气等离子喷涂  LZO/ 8YSZ 双陶瓷  热障涂层  CaO-MgO-Al 2O3 -SiO2 (CMAS) 腐蚀
DOI：10.11933/j.issn.1007-9289.20190619001
分类号:TG174.442
文章编号:1007-9289(2020)01-0091-10
文献标识码:A
基金项目:国家自然科学基金(51674130)；甘肃省国际科技合作特派员计划(17JR7WA017)；甘肃省重点研发计划(17YF1WA159)
Corrosion Properties of LZO/ 8YSZ Double Ceramic Thermal Barrier Coatings
Yang Lexin, Li Wensheng, An Guosheng, Zhang Yi
State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou 730050 , China
Abstract:
In order to investigate the microstructure, mechanical properties and the case of stopping penetration, the 8YSZ and LZO/ 8YSZ thermal barrier coatings (TBCs) basing on Al 2O3 were prepared by air plasma spraying. The phase structure and microstructure of 8YSZ and LZO/ 8YSZ TBCs were studied by XRD, SEM and EDS. The coating hardness and penetration depth after corrosion were analyzed by the Vickers hardness test and Image Pro plus software. The results showed the corrded thickness of LZO/ 8YSZ TBCs in LZO layer was about 57 μm after 12 h. The phases of the reaction layer have mainly spherical ZrO2 and rod-like Ca2La8(SiO4 )6O2 , accompaning by a small amount of CaAl 2 Si 2O8 and MgAl 2O4 . The 8YSZ single ceramic TBCs was a corrosion depth of about 300 μm (whole 8YSZ coating), while its cross section has becomed a loose structure mainly composing of spherical m-ZrO2 . The hardnesses of the 8YSZ and LZO reaction layers have increased after corrosion, but it did not cause cracking at the corrosion interface. The stability of the internal 8YSZ was protected by the reaction of La with CMAS to form dense apatite (Ca2La8(SiO4 )6O2 ) which effectively blocked the infiltration of CMAS.
Key words:  air plasma spraying  LZO/ 8YSZ double ceramic  thermal barrier coatings  CaO-MgO-Al 2O3 -SiO2(CMAS) corrosion
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