CAJ | 학술논문

以固相法合成的K0.5Na0.5NbO3(KNN)粉体基料，熔盐法合成的片状Sr2Bi4Ti5O18晶粒为模板，采用水系流延法制备织构化KNN无铅压电陶瓷，研究了烧结温度对材料性能的影响。发现烧结温度对陶瓷的体积密度、线收缩率、织构度和压电性能均有重要影响。随着烧结温度的升高，压电性能逐渐提高，1120℃时达到最大值。其中平行于流延方向的压电常数d33达到113 pC/N，平面机电耦合系数kp为39.4%，介电常数εT33/ε0为486；而垂直于流延方向d33只有82 pC/N，kp为35.5%，介电常数εT33/ε0为456，显示出明显的各向异性。
이고상법합성적K0.5Na0.5NbO3(KNN)분체기료，용염법합성적편상Sr2Bi4Ti5O18정립위모판，채용수계류연법제비직구화KNN무연압전도자，연구료소결온도대재료성능적영향。발현소결온도대도자적체적밀도、선수축솔、직구도화압전성능균유중요영향。수착소결온도적승고，압전성능축점제고，1120℃시체도최대치。기중평행우류연방향적압전상수d33체도113 pC/N，평면궤전우합계수kp위39.4%，개전상수εT33/ε0위486；이수직우류연방향d33지유82 pC/N，kp위35.5%，개전상수εT33/ε0위456，현시출명현적각향이성。
In this paper, K0.5Na0.5NbO3 (KNN) synthesized by solid state reaction as base materials, flake Sr2Bi4Ti5O18 grain prepared by molten salt synthesis method as template, the KNN textured lead-free piezoelectric ceramic was prepared by aqueous tape-casting technique, and the effect of sintering temperature on the performance was studied. The results showed that the sintering temperature has very important inlfuence on the linear shrinkage, bulk density, texturing and piezoelectric properties. With the increase of sintering temperature, the performance increases and reaches maximum at 1120℃ and then decreases. In the parallel tape-casting direction, the piezoelectric constant d33 reaches 113 pC/N, the planar electromechanical coupling coefifcient kP is 39.4%, the dielectric constant εT33/ε0 is 486; and at the perpendicular direction, the d33is only 82 pC/N, the kP is 35.5%, and the εT33/ε0 is 456, showing obvious anisotropy.