Er2O3和TiO2双位共掺杂Y3Al5O12热障涂层陶瓷材料的微观组织与热导率

doi:10.15541/jim20260190

无机材料学报

• •

Er₂O₃和TiO₂双位共掺杂Y₃Al₅O₁₂热障涂层陶瓷材料的微观组织与热导率

郭慧敏¹, 王炫力^1,2,3,4, 宋希文^2,3,5, 谢敏^1,2,3, 王志刚^1,2,3, 张永和^1,2,3, 王思凯⁶

1.内蒙古科技大学材料科学与工程学院, 包头 014010;
2.内蒙古自治区先进陶瓷材料与器件重点实验室, 包头 014010;
3.轻稀土资源绿色提取与高效利用教育部重点实验室, 包头 014010;
4.清华大学材料学院, 新型陶瓷材料全国重点实验室, 北京 100084;
5.鄂尔多斯职业学院, 鄂尔多斯 017000;
6.内蒙古晶陶锆业有限公司, 包头 014060

收稿日期:2026-04-30 修回日期:2026-07-05
作者简介:郭慧敏(1998-), 女, 硕士研究生. E-mail: ghm1715653778@163.com
基金资助:
内蒙古自治区自然科学基金项目(2025MS05002); 内蒙古自治区“英才兴蒙”工程团队项目(2026TEL12)

Microstructure and Thermal Conductivity of Er₂O₃ and TiO₂ Dual-site Co-doped Y₃Al₅O₁₂ Ceramic Materials for Thermal Barrier Coatings

GUO Huimin¹, WANG Xuanli^1,2,3,4, SONG Xiwen^2,3,5, XIE Min^1,2,3, WANG Zhigang^1,2,3, ZHANG Yonghe^1,2,3, WANG Sikai⁶

1. School of Materials Science and Engineering, Inner Mongolia University of Science and Technology, Baotou 014010, China;
2. Inner Mongolia Key Laboratory of Advanced Ceramic Material and Devices, Baotou 014010, China;
3. Key Laboratory of Green Extraction & Efficient Utilization of Light Rare-Earth Resources, Ministry of Education, Baotou 014010, China;
4. State Key Laboratory of New Ceramics Materials, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China;
5. Department of Chemical Engineering, Ordos Vocational College, Ordos 017000, China;
6. Inner Mongolia Jingtao Zirconium Industry Co., Ltd., Baotou 014060, China

Received:2026-04-30 Revised:2026-07-05
About author:GUO Huimin (1998-), female, Master candidate. E-mail: ghm1715653778@163.com
Supported by:
Natural Science Foundation Project of Inner Mongolia Autonomous Region (2025MS05002); “Elite Revitalizing Inner Mongolia” Project Team Program (2026TEL12)

摘要/Abstract

摘要： 针对钇铝石榴石(Y₃Al₅O₁₂,YAG)陶瓷高热导率限制其在热障涂层(TBCs)领域应用的问题,本研究采用固相反应法制备了Y_1.2Er_1.8Al_5-_xTi_xO₁₂(x=0, 0.1, 0.2, 0.3, 0.4, 0.5)陶瓷材料,系统探究了Ti掺杂对其物相、晶格占位、元素价态、微观形貌及热导率的影响。X射线衍射结果表明,所有样品均呈现单一的YAG相。随着Ti掺杂浓度的增加,晶格常数逐渐增大,这归因于离子半径较大的Ti⁴⁺取代较小的Al³⁺所引起的晶格畸变。由于Ti⁴⁺与Al³⁺之间存在价态差异,体系中引入阳离子空位,改变了材料的缺陷结构与扩散行为。结合场发射扫描电子显微镜分析结果可知,Ti掺杂诱导形成的阳离子空位显著提高了离子扩散速率,促进烧结颈的生长与晶粒间的连接,从而显著提升陶瓷材料密度和晶粒尺寸。在离子半径差异与阳离子空位的协同散射作用下,声子散射显著增强,声子平均自由程有效降低,从而使Er₂O₃与TiO₂双位共掺杂YAG陶瓷的热导率显著降低。其中,Y_1.2Er_1.8Al_4.6Ti_0.4O₁₂在1100 ℃时表现出最低热导率,约为1.41 W·m^-1·K^-1,较纯YAG降低约29.5%。综上所述,双位共掺杂策略有效降低了YAG陶瓷的热导率,为TBCs领域新型材料的设计提供了研究思路。

关键词: 热障涂层, Y₃Al₅O₁₂, 双位共掺, 空位缺陷, 热导率

Abstract: To address the intrinsically high thermal conductivity that limits the application of yttrium aluminum garnet (Y₃Al₅O₁₂, YAG) ceramics in ultra-high temperature thermal barrier coatings (TBCs), a synergistic point-defect engineering strategy was proposed in this study. Using a solid-state reaction route at 1300 ℃ for 8 h, a series of Y_1.2Er_1.8Al_5-_xTi_xO₁₂ (x=0, 0.1, 0.2, 0.3, 0.4, 0.5) ceramics were successfully synthesized. Subsequently, systematic investigations were conducted to explore the effects of Ti doping on phase structure, lattice occupancy, elemental valence states, micro-morphology, and thermal conductivity. Rietveld refinement of XRD patterns revealed that all samples maintained a single YAG phase. As the Ti doping concentration increased, lattice parameters exhibited an overall upward trend; however, an abnormal decrease was observed at x=0.4, which was attributed to a shift in site occupancy preference. Crystallographic analysis confirmed that Er³⁺ ions preferentially occupied the 24c dodecahedral sites, whereas Ti⁴⁺ ions are distributed across both 16a octahedral and 24d tetrahedral sites. Field emission scanning electron microscopy observations indicated that cation vacancies induced by Ti doping significantly enhanced atomic diffusion rates and promoted sintering neck coarsening, thereby distinctly improving material densification. Thermal conductivity measurements revealed a significantly shortened phonon mean free path, driven by the synergistic scattering effects arising from atomic mass fluctuations, ionic radius mismatches, and cation vacancies. At 1100 ℃ in particular, Y_1.2Er_1.8Al_4.6Ti_0.4O₁₂ ceramic achieved the lowest thermal conductivity of approximately 1.41 W·m^-1·K^-1, representing a reduction of approximately 29.5% compared with that of pure YAG. Overall, these findings suggest that introducing strong scattering centers, specifically cation vacancies, through dual-site co-doping offers a reliable route to suppress thermal conduction in YAG ceramics, establishing a solid theoretical foundation for their practical application in extreme high-temperature environments. In summary, the dual-site co-doping strategy effectively reduces the thermal conductivity of YAG, providing a promising approach for the design and development of advanced TBCs.

Key words: thermal barrier coating, Y₃Al₅O₁₂, dual-site co-doping, vacancy defect, thermal conductivity

中图分类号:

TQ174

郭慧敏, 王炫力, 宋希文, 谢敏, 王志刚, 张永和, 王思凯. Er₂O₃和TiO₂双位共掺杂Y₃Al₅O₁₂热障涂层陶瓷材料的微观组织与热导率[J]. 无机材料学报, DOI: 10.15541/jim20260190.

GUO Huimin, WANG Xuanli, SONG Xiwen, XIE Min, WANG Zhigang, ZHANG Yonghe, WANG Sikai. Microstructure and Thermal Conductivity of Er₂O₃ and TiO₂ Dual-site Co-doped Y₃Al₅O₁₂ Ceramic Materials for Thermal Barrier Coatings[J]. Journal of Inorganic Materials, DOI: 10.15541/jim20260190.

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Er₂O₃和TiO₂双位共掺杂Y₃Al₅O₁₂热障涂层陶瓷材料的微观组织与热导率

Microstructure and Thermal Conductivity of Er₂O₃ and TiO₂ Dual-site Co-doped Y₃Al₅O₁₂ Ceramic Materials for Thermal Barrier Coatings

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