【摘要】 将水基流延技术与低温烧结陶瓷技术相结合，用于BST挠曲电陶瓷的研制和能量的收集。为了降低BST的烧结温度，在BST水基流延浆料中添加了质量分数1%～4%的Li₂CO₃,将浆料流延成薄片后进行烧结。研究了Li₂CO₃掺杂量对烧结温度的影响以及BST薄片厚度对材料电性能的影响。实验结果表明，适量的Li₂CO₃掺杂能够将BST的烧结温度降低约250℃。在烧结后的薄片两面涂上银电极和适当厚度的PDMS,得到“三明治结构”的BST复合薄片，用于介电、挠曲电测试和能量收集实验。当Li₂CO₃掺杂量为质量分数2%时，300μm厚的BST复合薄片在1100℃烧结后介电性能最优，其介电常数为3200,介质损耗为0.05。而200μm厚的复合薄片表现出最高的横向挠曲电系数，达到0.24μC/m。此外，40μm厚的复合薄片表现出最好的电流输出能力，达到1.2 nA。更多还原

【Abstract】 By combining water-based casting and low-temperature sintering technology, BST flexoelectric ceramics was prepared, and the energy harvesting property of the ceramics was studied. In order to reduce the sintering temperature of BST, 1%-4% Li₂CO₃ was added to BST water-based cast slurry, and the slurry was cast into sheets and sintered. The effect of Li₂CO₃ doping on the sintering temperature and the effect of the thickness of the BST sheet on the electrical properties of the material were investigated. Experimental results show that Li₂CO₃ doping can reduce the BST sintering temperature by about 250 ℃. The silver electrodes and PDMS of appropriate thickness were coated on both sides of the sintered sheet to obtain a "sandwich structure" BST composite sheet, which was subjected to dielectric and flexural tests and energy harvesting experiments. The results show that when the Li₂CO₃ doping amount is 2%, the 300 μm thick BST sheet has the best dielectric properties after sintering at 1100 ℃, with a dielectric constant of 3200 and a dielectric loss of 0.05. Meanwhile, the 200 μm composite sheet shows the highest transverse flexural coefficient of 0.24 μC/m. In addition, the ceramic sheet with the thickness of 40 μm offers the current output of 1.2 nA, which shows good current output capability.更多还原