压电陶瓷基复合材料热错配应力-准同型相变耦合行为及其对压电性能的影响

项目名称： 压电陶瓷基复合材料热错配应力-准同型相变耦合行为及其对压电性能的影响

项目编号： No.11272102

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 数理科学和化学

项目作者： 费维栋

作者单位： 哈尔滨工业大学

项目金额： 82万元

中文摘要： 压电陶瓷基复合材料具有广泛的应用背景，以往研究的主要目的是改善其力学性能以适应器件对其综合性能的要求，但其代价是压电性能的劣化。本项目主要依据以下两点，其一是热错配应力是复合材料的内禀属性；其二是某些ABO3钙钛矿型压电陶瓷的准同型相变对应力敏感，而准同型相变是获得优异压电效应的关键。本项目拟通过热错配应力-准同型相变耦合模型的研究，探讨如何利用热错配应力优化复合材料的压电性能，及设计新型压电材料。本项目将以氧化物陶瓷颗粒增强Pb(Zr,Ti)O3和掺杂BiFeO3两类陶瓷基复合材料为对象，通过物理、力学模型的建立，研究复合材料基体准同形相变的条件，探讨热错配应力-准同型相变的耦合行为与机制，从力学和微观两个层面上揭示热错错配应力对准同型相变的影响机理，阐明热错配应力、准同型相含量等对复合材料压电性能的影响规律。最终为提高陶瓷基压电复合材料的压电性能、设计新型无铅压电材料提供依据。

中文关键词： 压电材料；应力；准同型相变；压电性能；负电容

英文摘要： Piezoelectric matrix composites are the candidate materials in many fields, and the main purpose of the previous studies on the composites have been focused on the improvement of the mechanical properties of the composite to satisfy the requests of applications in the combination properties for the composite. However,the piezoelectric properties of the composite decreases with the inclusion content increasing. The present study is put forward on the basis of following reasons: on the one hand, thermal mismatch stress is the intrinsic feature of compoites. On the other hand, the morphotropic transition of some ABO3 type piezoelectric ceramics is very sensitive to stress, which is the key factor to obtain excellent piezoelectric response of the ceramics. The main aims of the present study are to optimize the piezoelectric properties of piezoelectric ceramic matrix composite and design new type piezoelectric composites on the basis of the coupling model of thermal mismatch stress and morphotropic transition. The materials studied in the present project are oxide particle reinforced Pb(Zr,Ti)O3 or doped BiFeO3 composites. Based on the physical and mathematical models, the critical conditions of morphotropic transition and the coupling behaviors of thermal mismatch stress-morphotropic transition will be investigated.

英文关键词： Piezoelectrics；Stress；MPB；Piezoelectric properties；Negative capacitance