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利用放电等离子烧结高致密度的铌酸钾钠基无铅压电作为陶瓷相,通过改进后的切割-浇注法复合基体相环氧树脂,制备得到陶瓷柱宽40μm、间隙40μm、纵横比>5的超微细化结构的1-3型铌酸钾钠基陶瓷/环氧树脂无铅压电复合材料(1-3 connective lead-free piezoelectric composites,1-3CLFPC)。1-3CLFPC薄膜的电学性能显示出其作为超声换能器工作的优势:压电电压常数g33达到247×10-3 m2/C,厚度机电耦合系数kt为40.7%。超微细化结构设计也使得1-3CLFPC薄膜的工作频率提高到5 MHz以上,可满足高频医疗超声诊断领域的需求。
The high-density potassium-sodium-potassium niobate-based lead-free piezoelectric ceramics were sintered by spark plasma sintering. The matrix phase epoxy resin was prepared by the improved cutting-casting method. The ceramic column width 40μm, the gap 40μm, the aspect ratio> 5 Of ultrafine structure type 1-3 potassium-sodium niobate based ceramic / epoxy lead-free piezoelectric composites (1-3 connective lead-free piezoelectric composites, 1-3CLFPC). The electrical properties of 1-3CLFPC films show their advantages as ultrasonic transducers: the piezoelectric voltage constant g33 reaches 247 × 10-3 m2 / C and the thickness electromechanical coupling coefficient kt is 40.7%. Ultrafine structure design also makes 1-3CLFPC film operating frequency increased to 5 MHz above, to meet the needs of high-frequency medical ultrasound diagnosis.