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Mechanical bending strength of (Bi 0.5 Na 0.5 ) TiO 3 -based lead-Free piezoelectric ceramics
Journal of Asian Ceramic Societies ( IF 2.3 ) Pub Date : 2017-09-01 , DOI: 10.1016/j.jascer.2017.03.002
Hiroaki Takahashi 1 , Hajime Nagata , Tadashi Takenaka 1
Affiliation  

Abstract (Bi0.5Na0.5)TiO3 [BNT] is expected as one of candidate lead-free materials because these ceramics show relatively good high-power piezoelectric properties. In this study, we tried to understand the bending strength and fracture behavior of the BNT-based ceramics. To measure the bending strength, a three-point bending test on the basis of JIS was conducted using 12.0 × 4.0 × 1.0 mm3 specimens. An average bending strength, σA, of pure BNT ceramics sintered at 1100 °C for 2, 12 and 24 h were 217, 195 and 187 MPa, respectively. It is cleared that the σA increased with decreasing the sintering time, (grain size and pore size). We also investigated the bending strength of Nb2O5 doped BNT ceramics [BNT-Nb x, x = 0.05 ∼ 1.5 wt%] and MnCO3 doped BNT ceramics [BNT-Mn x, x = 0.5 and 1.0 wt%]. Values of the σA of BNT-Nb 0.5 and BNT-Mn 0.5 were 222, and 188 MPa, respectively. It is clarified that soft dopants (Nb) can improve the bending strength of BNT-based ceramics. Additionally, hot-pressed BNT [HP-BNT] were sintered at 1050 °C for 5 h, and the σA of HP-BNT was 245 MPa.

中文翻译:

(Bi 0.5 Na 0.5 ) TiO 3 基无铅压电陶瓷的机械弯曲强度

摘要 (Bi0.5Na0.5)TiO3 [BNT]由于表现出较好的高功率压电性能,有望成为候选的无铅材料之一。在这项研究中,我们试图了解 BNT 基陶瓷的弯曲强度和断裂行为。为了测量弯曲强度,使用 12.0 × 4.0 × 1.0 mm3 试样进行了基于 JIS 的三点弯曲试验。在 1100 °C 下烧结 2、12 和 24 小时的纯 BNT 陶瓷的平均弯曲强度 σA 分别为 217、195 和 187 MPa。很明显,σA 随着烧结时间的减少而增加(晶粒尺寸和孔径)。我们还研究了 Nb2O5 掺杂的 BNT 陶瓷 [BNT-Nb x, x = 0.05 ∼ 1.5 wt%] 和 MnCO3 掺杂的 BNT 陶瓷 [BNT-Mn x, x = 0.5 和 1.0 wt%] 的弯曲强度。BNT-Nb 0.5和BNT-Mn 0.5的σA值为222,和 188 兆帕,分别。明确了软掺杂剂(Nb)可以提高 BNT 基陶瓷的弯曲强度。此外,热压 BNT [HP-BNT] 在 1050 °C 下烧结 5 小时,HP-BNT 的 σA 为 245 MPa。
更新日期:2017-09-01
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