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基于Li_(6.75)La_3Zr_(1.75)Nb_(0.25)O_(12)(LLZNO)陶瓷材料的近室温高阻尼特性并与金属Cu复合,设计和制备了高阻尼LLZNO/Cu复合材料,并采用多功能内耗仪和显微硬度测量仪对复合材料的阻尼性能和力学性能进行了评价.研究结果表明:与相同制备工艺的纯Cu基体材料相比,LLZNO/Cu复合材料的阻尼性能和硬度值均有显著提高,其中,陶瓷颗粒质量分数为30%的LLZNO/Cu复合材料的阻尼峰值高达0.050,比纯Cu阻尼值提高近25倍,硬度值也从纯Cu试样的59MPa提高到近91MPa.进一步的阻尼-振幅依赖性测试表明,即使应变振幅降低到10×10~(-6),LLZNO/Cu复合材料的阻尼性能也基本保持不变,表现出典型的微振动敏感特性,其机制起因于应力作用下LLZNO陶瓷内高浓度Li离子迁移扩散诱导的能量耗散.
Based on the high-temperature damping properties of Li_ (6.75) La_3Zr_ (1.75) Nb_ (0.25) O_ (12) (LLZNO) ceramics at room temperature and compositing with metallic Cu, a high damping LLZNO / Cu composite was designed and fabricated. The internal damping and the microhardness tester were used to evaluate the damping and mechanical properties of the composites.The results show that the damping properties and hardness of LLZNO / Cu composites are better than those of the pure Cu matrix composites , The damping peak value of LLZNO / Cu composites with ceramic particles mass fraction of 30% was up to 0.050, which was 25 times higher than the pure Cu damping value and the hardness value increased from 59MPa to 91MPa of pure Cu sample. The damping-amplitude-dependent tests show that the damping properties of LLZNO / Cu composites are basically the same even though the strain amplitude is reduced to 10 × 10 -6, which shows the typical micro-vibration sensitive characteristics. The mechanism of LLZNO / Energy Dissipation Induced by Migration and Diffusion of Li Ion in LLZNO Ceramics under Stress.