Shen Zong-Yang, Li Jing-Feng, Chen Ruimin, Zhou Qifa, Shung K Kirk
State Key Laboratory of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China.
J Am Ceram Soc. 2011 May;94(5):1346-1349. doi: 10.1111/j.1551-2916.2011.04508.x.
Fine-grained Pb-free (Na(0.535)K(0.485))(0.95)Li(0.05)(Nb(0.8)Ta(0.2))O(3) (NKLNT) piezoceramics prepared by spark plasma sintering (SPS) technique was used to fabricate NKLNT/epoxy 1-3 composites with a modified dice-fill method. Because of its good machinability, SPSed NKLNT ceramic rods could be miniaturized to a lateral width of 50 µm. After lapping down to 56 µm in thickness, the composite was used to fabricate an ultrasonic transducer as the active piezoelectric element. This composite transducer showed a bandwidth at -6 dB nearly 90%at a center frequency of 29 MHz, demonstrating that this Pb-free composite thick film is very promising for the fabrication of high-frequency ultrasonic transducers in medical imaging applications.
采用放电等离子烧结（SPS）技术制备的细晶无铅(Na(0.535)K(0.485))(0.95)Li(0.05)(Nb(0.8)Ta(0.2))O(3)（NKLNT）压电陶瓷，通过改进的切块填充法制备了NKLNT/环氧树脂1-3复合材料。由于其良好的可加工性，经SPS烧结的NKLNT陶瓷棒可被小型化为横向宽度为50 µm。在研磨至厚度为56 µm后，该复合材料被用于制造超声换能器作为有源压电元件。该复合换能器在中心频率29 MHz时，-6 dB带宽接近90%，表明这种无铅复合厚膜在医学成像应用中的高频超声换能器制造方面非常有前景。
