Influence of ball milling on sintering behavior and electrical properties of (Li,Na,K)NbO3 lead-free piezoceramics
Influence of ball milling on sintering behavior and electrical properties of (Li,Na,K)NbO3 lead-free piezoceramics
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DOI：
10.1007/s10853-012-6635-4
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发表时间：
2012-10-01
影响因子：
4.5
通讯作者：
Wang, Qing-Ming
中科院分区：
文献类型：
--
作者：
Cheng, Li-Qian;Zhou, Jia-Jun;Wang, Qing-Ming
碱元素在烧结过程中的挥发是影响无铅(Na，K)NbO_3(KNN)压电陶瓷成型稳定性的主要因素之一。为了通过细化颗粒尺寸来降低烧结温度，采用固相粉末合成法和常规烧结方法制备了名义成分为Li-0.058(Na0.52K0.48)(0.942)NbO_3的KNN基陶瓷。结果表明，延长焙烧前球磨时间可显著降低粉末的粒度，从而降低烧结温度。结果表明，在1025A℃的低温下烧结得到了具有良好的压电性和铁电性的高致密材料，其逆压电系数d*(33)和剩余极化P(R)分别达到266 pm/V和15.7muC/cm(2)。本研究为优化配方、减小颗粒尺寸、提高KNN基陶瓷的压电性能提供了一种简便有效的方法。
Volatilization of alkali elements during sintering process is one of the major factors influencing the processing stability of lead-free (Na,K)NbO3 (KNN) piezoceramics. With a purpose to reduce sintering temperature by refining particle sizes, an extensive ball-milling step was intentionally introduced to the fabrication process of KNN-based ceramics with a nominal composition of Li-0.058(Na0.52K0.48)(0.942)NbO3 by a solid-state powder synthesis and normal sintering method. It was revealed that prolonging the period for milling calcined powders before sintering process significantly reduced the particle sizes and hence sintering temperature. As a result, sintering at a reduced temperature of 1,025 A degrees C resulted in a highly dense material with good piezoelectric and ferroelectric properties with converse piezoelectric coefficient d* (33) and remnant polarization P (r) reaching 266 pm/V and 15.7 mu C/cm(2), respectively. This study provided a facile and effective method to enhance the piezoelectric properties in KNN-based ceramics with an optimized composition by reducing the particle sizes.