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首页> 外文期刊>Journal oflaser Applications >Laser sintering effects on the physical properties and structure of 0.94(K_(0.5)Na_(0.5))NbO_3-0.06LiTaO_3 lead-free piezoelectric ceramics
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Laser sintering effects on the physical properties and structure of 0.94(K_(0.5)Na_(0.5))NbO_3-0.06LiTaO_3 lead-free piezoelectric ceramics

机译：激光烧结对0.94（K_（0.5）Na_（0.5））NbO_3-0.06LiTaO_3无铅压电陶瓷物理性能和结构的影响

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摘要

Taking laser as the heat source for ceramic sintering, 0.94K_(0.5)Na_(0.5)NbO_3-0.06LiTaO_3, ceramics with unique physical properties were prepared. Fine ferroelectric properties with remnant polarization of 18 μC/cm~2 and coercive field of 18.8 kV/cm were obtained. The piezoelectric properties and density of the ceramics were d_(33) ～ 120 pC/N, k_p ～ 36.6%, T_C ～ 420 ℃. and p ～ 4.125 g/cm~3. The shift of the two phase transition temperatures (tetragonal-orthorhombic phase transition temperature T_(O,T)shifting to 100 ℃ from 190 ℃ while Curie temperature T, shifting to 420 from 394 ℃) in laser-sintered ceramics reflects large structure distortion of phase transition and Li~+ substitution of high temperature phase. Orientation degree of the texture structure based on anisometric grains of submicron diameter in the ceramics was 23%. The texture structure corresponding to the fine ferroelectric properties was resulted from the mass transform in liquid phase and strictly heating directivity o~f laser irradiation. O_2 discharge through coaxial nozzle takes some actions like O_2 annealing ar.i effectively suppression on the volatilization of Na_2O during laser sintering. Lager substitution of Li~+ leads to the presence of small amount of K_3Li_2Nb_5O_(15) phase damaging in d_(33). By analysis of the sintering effects on the properties and structure evolution, laser sintering was shown as a promising method in preparation of functional ceramics with excellent and applicable physical properties, compared to a traditional furnace sintering method.
机译：以激光作为陶瓷烧结的热源0.94K_（0.5）Na_（0.5）NbO_3-0.06LiTaO_3，制备了具有独特物理性能的陶瓷。获得了良好的铁电性能，剩余极化强度为18μC/ cm〜2，矫顽场为18.8 kV / cm。陶瓷的压电性能和密度为d_（33）〜120 pC / N，k_p〜36.6％，T_C〜420℃。 p〜4.125 g / cm〜3。激光烧结陶瓷的两个相变温度（四方-正交相变温度T_（O，T）从190℃转变为100℃，居里温度T，从394℃转变为420）的变化反映了陶瓷的大结构变形。相转变和高温相的Li〜+取代。基于亚微米直径的等距晶粒的陶瓷中的织构结构的取向度为23％。液相中的质量转化和激光辐照严格的加热方向性导致了具有良好铁电性能的织构。通过同轴喷嘴喷出的O_2采取了O_2退火等动作，有效抑制了激光烧结过程中Na_2O的挥发。 Li〜+的较大取代导致d_（33）中存在少量K_3Li_2Nb_5O_（15）相破坏。通过分析烧结对性能和结构演变的影响，与传统的熔炉烧结方法相比，激光烧结被证明是一种制备具有优良和适用物理性能的功能陶瓷的有前途的方法。

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  • 来源
    《Journal oflaser Applications》 |2009年第3期|124-128|共5页
  • 作者

    Lingfei Ji; Yijian Jiang; Yi Gao; Xinyu Du;

  • 作者单位

    Institute of Laser Engineering, Beijing University of Technology, Beijing 100022, People's Republic of China;

    Institute of Laser Engineering, Beijing University of Technology, Beijing 100022, People's Republic of China;

    Institute of Laser Engineering, Beijing University of Technology, Beijing 100022, People's Republic of China;

    Institute of Laser Engineering, Beijing University of Technology, Beijing 100022, People's Republic of China;

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  • 正文语种 eng
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  • 关键词

    laser sintering; lead-free piezoelectric ceramics; physical properties; texture structure;

    机译：激光烧结无铅压电陶瓷;物理性质纹理结构;

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