Deformation and bending strength of high performance lead‐free piezoceramics
Deformation and bending strength of high performance lead‐free piezoceramics
复制标题
高性能无铅压电陶瓷的变形和弯曲强度
DOI：
10.1111/jace.18311
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发表时间：
2022
影响因子：
3.9
通讯作者：
Rödel J
中科院分区：
文献类型：
--
作者：
Lalitha KV;Isaia D;Gong W;Rödel J
商业相关无铅压电陶瓷- 0.935Na0.5Bi0.5TiO3 - 0.065BaTiO3的弯曲强度（NBT-6.5BT）具有和不具有受主Zn-掺杂，以及0.92（K0.5Na0.5）NbO3 - 0.02（Bi0.5Li0.5）TiO 3-xBaZrO 3; x= 0.06，0.07（KNN-BZ 100 x）已使用4点弯曲测试进行量化，并与商业锆钛酸铅（PZT，PIC 151）进行对比。在4点弯曲下使用附加应变计探测的压缩和拉伸强度表明非线性变形可忽略不计，与市售PIC 151形成鲜明对比。KNN-BZ 100的抗弯强度约为100 MPa，与PIC 151相当，而NBT-6.5BT-基材料的抗弯强度约为PIC 151的两倍，达到160 MPa。基于无铅压电陶瓷在断裂韧性、矫顽应力和杨氏模量方面的固有特性，这些结果是合理的。威布尔统计表明KNN基材料的断裂概率更高，NBT-6.5BT基材料的威布尔模量是KNN基材料的两倍。
Bending strength of commercially relevant lead‐free piezoceramics – 0.935Na0.5Bi0.5TiO3‐0.065BaTiO3(NBT‐6.5BT) with and without acceptor Zn‐doping and 0.92(K0.5Na0.5)NbO3‐0.02(Bi0.5Li0.5)TiO3‐xBaZrO3;x= 0.06, 0.07 (KNN‐BZ100x) have been quantified using 4‐point bending tests and contrasted to that of commercial lead zirconate titanate (PZT, PIC151). The compressive and tensile strength probed using additional strain gauges under 4‐point bending indicate negligible non‐linear deformation, in stark contrast to that of commercial PIC151. The bending strength of KNN‐BZ100xis about 100 MPa, comparable to PIC151, while that of NBT‐6.5BT‐based materials is about twice that of PIC151 at ∼160 MPa. These results are rationalized based on the intrinsic characteristics of the lead‐free piezoceramics in terms of fracture toughness, coercive stress, and Young's modulus. Weibull statistics indicate a higher fracture probability for KNN‐based materials, with NBT‐6.5BT‐based materials featuring Weibull modulus twice that of KNN‐based materials.