硅酸盐学报

热障涂层用Y₃NbO₇-YNbO₄复合陶瓷材料的力学及热物理性能

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田京维 ¹ , 王中源 ¹ , 王乐垚 ¹ , 张若琦 ¹ , 王树棋 ¹ , 陈国梁 ¹ , 邹永純 ¹ , 王亚明 ¹ , 黄磊 ² , 周玉 ¹

硅酸盐学报 | 研究论文 2026,54(9): 3056-3065

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硅酸盐学报 |研究论文 2026 , 54 (9) : 3056 -3065

热障涂层用Y₃NbO₇-YNbO₄复合陶瓷材料的力学及热物理性能

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田京维¹, 王中源¹, 王乐垚¹, 张若琦¹, 王树棋¹, 陈国梁¹, 邹永純¹, 王亚明¹, 黄磊², 周玉¹

作者信息

^1．哈尔滨工业大学材料科学与工程学院特种陶瓷研究所，哈尔滨 150080

^2．洛阳船舶材料研究所，海洋腐蚀与防护全国重点实验室，河南洛阳 471023

通讯作者:

王树棋（1994—），男，博士，副教授。

作者简介:

田京维（2001—），男，硕士研究生。

Mechanical and Thermal Physical Properties of Y₃NbO₇-YNbO₄ Composite Ceramics for Thermal Barrier Coatings

Jingwei TIAN¹, Zhongyuan WANG¹, Leyao WANG¹, Ruoqi ZHANG¹, Shuqi WANG¹, Guoliang CHEN¹, Yunchun ZOU¹, Yaming WANG¹, Lei HUANG², Yu ZHOU¹

Affiliations

^1.Institute of Advanced Ceramics, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150080, China

^2.Luoyang Ship Material Research Institute, National Key Laboratory of Marine Corrosion and Protection, Luoyang 471023, Henan, China

Corresponding Author:

{WANG} Shuqi (1994-), male, Ph.D., Associate Professor. E-mail: wang-shuqi@hit.edu.cn

TIAN Jingwei (2001-), male, Master candidate. E-mail: 1140077358@qq.com

出版时间: 2026-08-19 doi: 10.14062/j.issn.0454-5648.20250799

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摘要

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本工作采用原位合成与固相反应法制备了Y₃NbO₇-YNbO₄复合陶瓷，研究了YNbO₄第二相含量（0~70%，体积分数）对材料结构、力学及热学性能的影响。结果表明：两相具有良好的化学相容性，具有清晰的萤石结构与褐钇铌矿结构衍射峰，并通过扩散层缓解晶格差异，促进界面结合。随着YNbO₄含量增加，材料硬度和强度略微下降。当YNbO₄含量为30%时，复合陶瓷维持较高的维氏硬度（8.99 GPa）与强度（121.89 MPa），同时断裂能提升约13%，表现出优异的强韧匹配。此外，YNbO₄弥散分布于Y₃NbO₇基体中，阻断热传导通路，有效防止了热导率的升高；同时两相界面与折射率差异增强了声子/光子散射，使材料在800 ℃（2.5~14 μm波段）具备高红外发射率，有效抑制了热导率上翘问题，1000 ℃热导率仅为1.29 W·m^-1·K^-1。该组分复合材料兼具优良力学性能与热光学特性，在高温热防护领域具有重要应用潜力。

关键词

热障涂层 / 复合材料 / 缺陷萤石结构 / 弯曲强度 / 热导率 / 高温发射率

Abstract

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Introduction

Y₃NbO₇-YNbO₄ composite ceramic materials were synthesized by in-situ synthesis and solid-state reaction methods. The effect of YNbO₄ content (i.e., 0 to 70% in volume fraction) on the two-phase structure, distribution, and properties of the composite ceramics were investigated. W The results show that the hardness and strength of the composite ceramics decrease with the increase in YNbO₄ content. At YNbO₄ content of 30%, the composite ceramic can maintain a high Vickers hardness of 8.99 GPa and a strength of 121.89 MPa, while the fracture energy is increased by approximately 18%, showing good comprehensive strength and toughness. Also, YNbO₄ in C1 can be diffusely distributed around Y₃NbO₇, preventing the formation of high thermal conductive pathways. Meanwhile, the interface between the two phases and the refractive index difference enhances the scattering of sound/photons, thereby increasing the infrared radiation emissivity in the range of 2.5-14.0 μm at high temperatures and suppressing an increase in thermal conductivity at high temperatures. At 1000 ℃, the thermal conductivity is only 1.29 W·m^-1·K^-1.

Methods

In this study, Y₃NbO₇-YNbO₄ series ceramic materials were prepared by in-situ synthesis and solid-state reaction methods. The phase of Y₃NbO₇-YNbO₄ composite ceramics was characterized by X-ray diffraction (XRD). The microstructure morphology of the ceramic samples was analyzed by scanning electron microscopy (SEM) and energy dispersive spectrometry (EDS). The grain size of each sample was statistically analyzed bya software named ImageJ, and the size distribution was fitted by the Gaussian peak. The Vickers hardness (H_V) of the samples was determined by indentation method using a micro-Vickers hardness tester (HVT-1000A), and the indentation and crack were prefabricated. The three-point bending test was carried out on the composite ceramic samples by an electronic universal testing machine to obtain the stress-strain curve and the flexural strength of the material. The thermal diffusivity (α) was measured at 25-1000 ℃ by a laser flash diffusivity analyzer. The infrared emissivity in the range of 2.5-14.0 μm was characterized by Fourier transform infrared spectroscopy (FTIR).

Results and Discussion

For the mechanical properties, the Vickers hardness (H_V) of the pure phases of Y₃NbO₇ and YNbO₄ are 11.19 GPa and 4.82 GPa, respectively. The hardness of the Y₃NbO₇-YNbO₄ composite ceramics lies between the two pure phases, and its hardness has a good stability due to the uniform dispersion of the two phases in the composite material. At YNbO₄ content of 30%, the fracture surface of the composite ceramics shows a tortuous and undulating feature, accompanied by the pull-out phenomenon of the second phase grains, and the layered fracture morphology within the YNbO₄ grains also occurs. This fracture feature is closely related to the layered ferroelastic domain skeleton structure within the YNbO₄ grains. Under the driving of the stress field at the crack tip, the domain structure can adjust the atomic arrangement and orientation, thereby changing the crack propagation path and ultimately forming a layered fracture morphology. Regarding thermal properties, the thermal conductivity upturn phenomenon of sample C1 is significantly mitigated, and its high-temperature thermal conductivity is lower than that of the pure phase of Y₃NbO₇, with a thermal conductivity of only 1.29 W·m^-1·K^-1 at 1000 ℃. The microstructural analysis indicates that a small amount of YNbO₄ second phase in sample C1 is dispersed around the Y₃NbO₇ grains, and this distribution effectively blocks the formation of high thermal conductivity pathways, resulting in the lowest overall thermal conductivity performance in this series of materials. At the interface between the Y₃NbO₇ and YNbO₄ phases, due to the differences in lattice constants and crystal orientations, more significant lattice distortions occur compared to single-phase grain boundaries, forming strong phonon and photon scattering centers. The Y₃NbO₇-YNbO₄ composite material exhibits superior high-temperature thermal radiation shielding performance due to the high intrinsic emissivity of the YNbO₄ phase and the special optical properties formed after the two-phase composite.

Conclusions

A series of Y₃NbO₇-YNbO₄ composite ceramics with composition gradients were in-situ synthesized. The content and distribution state of the second phase YNbO₄ had a decisive influence on the comprehensive performance of the composite ceramics, especially the composite ceramic with 30% YNbO₄ content (sample C1) showed the optimum comprehensive performance. In terms of mechanical properties, the sample C1 maintained a relatively high bending strength (i.e., 121.89 MPa) and its fracture energy was 18% greater than that of the pure Y₃NbO₇ phase, achieving an optimization of toughness. Regarding thermal insulation performance, the YNbO₄ phase in the sample C1 was dispersed in a spherical form at the grain boundaries of the Y₃NbO₇ phase, and the Y₃NbO₇ phase blocked the interconnection between the YNbO₄ phases. This unique distribution could effectively block the formation of high thermal conductivity pathways. The second phase effectively suppressed the upward trend of the high-temperature thermal conductivity of the Y₃NbO₇ phase. At 1000 ℃, the thermal conductivity was only 1.29 W·m^-1·K^-1, which was 20% lower than that of the pure Y₃NbO₇ phase (i.e., 1.59 W·m^-1·K^-1), significantly reducing the upward trend. This optimization effect could be attributed to the increase in the high-temperature infrared emissivity of the material after the introduction of the YNbO₄ phase, thereby weakening the heat flow transmission dominated by infrared thermal radiation. In summary, the Y₃NbO₇-YNbO₄ composite ceramics achieved the performance synergy of low thermal conductivity and high strength and toughness through reasonable composition design and in-situ synthesis strategy. The sample C1 with excellent comprehensive performance could have a great application potential in the field of high-temperature thermal protection.

Key words

thermal barrier ceramics / composite materials / defective fluorite structure / bending strength / thermal conductivity / high-temperature emissivity

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田京维, 王中源, 王乐垚, 张若琦, 王树棋, 陈国梁, 邹永純, 王亚明, 黄磊, 周玉. 热障涂层用Y₃NbO₇-YNbO₄复合陶瓷材料的力学及热物理性能. 硅酸盐学报, 2026 , 54 (9) : 3056 -3065 . DOI: 10.14062/j.issn.0454-5648.20250799

Jingwei TIAN, Zhongyuan WANG, Leyao WANG, Ruoqi ZHANG, Shuqi WANG, Guoliang CHEN, Yunchun ZOU, Yaming WANG, Lei HUANG, Yu ZHOU. Mechanical and Thermal Physical Properties of Y₃NbO₇-YNbO₄ Composite Ceramics for Thermal Barrier Coatings[J]. Journal of the Chinese Ceramic Society, 2026 , 54 (9) : 3056 -3065 . DOI: 10.14062/j.issn.0454-5648.20250799

基金

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国家自然科学基金(52572071; 52571039; 52301085; 52571078)

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2026年第54卷第9期

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文章信息

doi: 10.14062/j.issn.0454-5648.20250799

接收时间：2025-11-01
首发时间：2026-10-22
出版时间：2026-08-19

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收稿日期：2025-11-01
修回日期：2025-12-07

基金

国家自然科学基金(52572071; 52571039; 52301085; 52571078)

作者信息

^1．哈尔滨工业大学材料科学与工程学院特种陶瓷研究所，哈尔滨 150080

^2．洛阳船舶材料研究所，海洋腐蚀与防护全国重点实验室，河南洛阳 471023

通讯作者:

王树棋（1994—），男，博士，副教授。

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https://castjournals.cast.org.cn/joweb/gsyxb/CN/10.14062/j.issn.0454-5648.20250799

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2种不同金属材料的力学参数

科 Family	属数 Number of genus	种数 Number of species	占总种数比例 Percentage of total species (%)	属 Genus	种数 Number of species	占总种数比例 Percentage of total species (%)
鹅膏菌科Amanitaceae	2	11	5.26	鹅膏菌属 Amanita	10	4.78
小菇科 Mycenaceae	2	12	5.74	丝盖伞属 Inocybe	5	2.39
多孔菌科 Polyporaceae	8	14	6.70	蜡蘑属 Laccaria	5	2.39
红菇科 Russulaceae	3	23	11.00	小皮伞属 Marasmius	6	2.87
				小菇属 Mycena	11	5.26
				光柄菇属 Pluteus	5	2.39
				红菇属 Russula	17	8.13
				栓菌属 Trametes	5	2.39

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