| 戴建伟,牟仁德,王鑫,许振华,何利民.ZrO2掺杂对La2Ce2O7力学和热物理性能影响的研究[J].装备环境工程,2019,16(10):21-26. DAI Jian-wei,MU Ren-de,WANG Xin,XU Zhen-hua,HE Li-min.Effects of ZrO2 Doping on Mechanical and Thermo-physical Properties of La2Ce2O7 Ceramics[J].Equipment Environmental Engineering,2019,16(10):21-26. |
| ZrO2掺杂对La2Ce2O7力学和热物理性能影响的研究 |
| Effects of ZrO2 Doping on Mechanical and Thermo-physical Properties of La2Ce2O7 Ceramics |
| 投稿时间：2019-03-01 修订日期：2019-04-12 |
| DOI：10.7643/issn.1672-9242.2019.10.004 |
| 中文关键词: 热障涂层 La2Ce2O7 力学性能 热物理性能 |
| 英文关键词:thermal barrier coating (TBC) La2Ce2O7 (LC) mechanical property thermo-physical property |
| 基金项目:国家高技术研究发展计划(863)(2015AA034403) |
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| Author | Institution |
| DAI Jian-wei | Key Laboratory for Advanced Corrosion and Protection of Aviation Materials, AECC, Beijing Institute of Aeronautical Materials, Beijing 100095, China |
| MU Ren-de | Key Laboratory for Advanced Corrosion and Protection of Aviation Materials, AECC, Beijing Institute of Aeronautical Materials, Beijing 100095, China |
| WANG Xin | Key Laboratory for Advanced Corrosion and Protection of Aviation Materials, AECC, Beijing Institute of Aeronautical Materials, Beijing 100095, China |
| XU Zhen-hua | Key Laboratory for Advanced Corrosion and Protection of Aviation Materials, AECC, Beijing Institute of Aeronautical Materials, Beijing 100095, China |
| HE Li-min | Key Laboratory for Advanced Corrosion and Protection of Aviation Materials, AECC, Beijing Institute of Aeronautical Materials, Beijing 100095, China |
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| 中文摘要: |
| 目的 提高La2Ce2O7(LC)陶瓷材料的断裂韧性。方法 采用固相反应方法合成Y2O3稳定ZrO2(YSZ)掺杂的La2Ce2O7(LC)陶瓷材料(LCZ)，研究LCZ块材的弹性模量、断裂韧性等力学性能，以及热膨胀系数、热传导率等热物理性能。结果 10%YSZ摩尔分数掺杂的LCZ块材的断裂韧性约为1.4 MPa.m1/2，比LC提高了近10%。YSZ掺杂有效地抑制了LC在200~400 ℃温度区间热膨胀系数下降的现象。在200~1200 ℃温度范围内，LCZ块材的热膨胀系数为10×10-6~12×10-6 K-1，在1200 ℃的热导率约为0.75 W/(m.K)，比YSZ降低了50%以上，显示了优异的隔热性能。结论 YSZ的掺杂使LC中部分Zr4+取代了La3+，降低了晶格中的O空位浓度，原子的横向剪切运动被削弱，有效地抑制了LC在200~400 ℃温度区间热膨胀系数下降的现象。由于t-ZrO2→m-ZrO2的相变对微裂纹的愈合作用，10%YSZ掺杂使LC块材的断裂韧性得到有效提高。 |
| 英文摘要: |
| Objective To improve the fracture toughness of La2Ce2O7 (LC) ceramics materials. Methods Yttria stabilized zirconia (YSZ) doped La2Ce2O7 (LC) materials (LCZ) were synthesized by solid-state sintering. The mechanical properties including Young’s modulus and fracture toughness and thermo-physical properties including thermal expansion coefficients and thermal conductivities were investigated. Results The fracture toughness of 10mol% YSZ-doped LC sample was about 1.4 MPa.m1/2, nearly 10% higher than that of the undoped LC sample. The sudden drop in TECs of LC at 200-400 ℃ was effectively constrained by YSZ doping, and the TECs of the LCZ sample were 10×10-6-12×10-6 K-1 at 200-1200 ℃. The thermal conductivity of the LCZ sample was about 0.75 W/(m.K) at 1200 ℃, at least 50% lower than that of the YSZ sample, presenting good heat-insulating property. Conclusion By YSZ doping, La3+ in LC in is replaced by Zr4+, the O vacancy concentration in the space is decreased and the lateral shear movement of atom is weakened, effectively restraining the decrease of thermal expansion coefficient of LC at 200-400 ℃. Since t-ZrO2→m-ZrO2e has indirect healing effect on light crack, the 10%YSZ effectively improves the fracture toughness of LC pieces. |
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