• Title, Summary, Keyword: Piezoelectric ceramics

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Development of Powder Injection Molding Process for a Piezoelectric PAN-PZT Ceramics

  • Han, Jun Sae;Park, Dong Yong;Lin, Dongguo;Chung, Kwang Hyun;Bollina, Ravi;Park, Seong Jin
    • Journal of Korean Powder Metallurgy Institute
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    • v.23 no.2
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    • pp.112-119
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    • 2016
  • A powder injection molding process is developed and optimized for piezoelectric PAN-PZT ceramics. Torque rheometer experiments are conducted to determine the optimal solids loading, and the rheological property of the feedstock is evaluated using a capillary rheometer. Appropriate debinding conditions are chosen using a thermal gravity analyzer, and the debound specimens are sintered using sintering conditions determined in a preliminary investigation. Piezoelectric performance measures, including the piezoelectric charge constant and dielectric constant, are measured to verify the developed process. The average values of the measured piezoelectric charge constant and dielectric constant are 455 pC/N and 1904, respectively. Powder injection molded piezoelectric ceramics produced by the optimized process show adequate piezoelectric performance compared to press-sintered piezoelectric ceramics.

Piezoelectric and Dielectric Properties of Low Temperature Sintering (Na,K,Li)(Nb,Sb,Ta)O3 Ceramics Doped with CuO (CuO 첨가된 저온소결 (Na,K,Li)(Nb,Sb,Ta)O3계 세라믹스의 압전 및 유전 특성)

  • Lee, Gwang-Min;Yoo, Ju-Hyun;Lee, Jie-Young
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.28 no.4
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    • pp.229-233
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    • 2015
  • In this paper, in order to develop outstanding Pb-free piezoelectric composition ceramics, the $(Na_{0.525}K_{0.443}Li_{0.037})(Nb_{0.883}Sb_{0.08}Ta_{0.037})O_3+0.3wt%Bi_2O_3+0.4wt%Fe_2O_3+xwt%CuO$ (x= 0~0.8 wt%)(abbreviated as NKL-NST) lead-free piezoelectric ceramics have been synthesized using the ordinary solid state reaction method. The effects of CuO-doping on the structure and electrical properties of the NKL-NST ceramics were systematically studied. The results show that the ceramics exhibit a pure perovskite structure with orthorhombic phase at room temperature, and secondary phase was found in the ceramics. The 0.4 wt%CuO added ceramics sintered at $950^{\circ}C$ showed the optimum properties of piezoelectric constant($d_{33}$), planar piezoelectric coupling coefficient(kp) and mechanical quality factor(Qm) : $d_{33}=213$[pC/N], kp= 0.43, Qm= 423,respectively.

The electric field dependence of the resonance characteristics and piezoelectric constant of the PZT-PMNS ceramics (인가전계에 따른 PZT-PMNS 세라믹의 공진특성 및 압전정수의 변화경향 분석)

  • Oh, Jin-Heon;Park, Cheol-Hyeon;Lim, Kee-Joe
    • Proceedings of the KIEE Conference
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    • pp.1258-1259
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    • 2008
  • In this paper, the variable tendency of the piezoelectric constant and resonance characteristics of the piezoelectric ceramics due to the electric field is studied. The practical application of piezoelectric ceramics is not only applied in field of small signal. For example, in case of an ultrasonic motor, 120 ${\sim}$ 130Vrms of driving voltage is needed. Therefore, to examine the characteristics of piezoelectric ceramics in large signal contributes to reducing the susceptibility to the multifarious application and securing the ease of the production of control circuit. These contributions may be connected to the expansion of industrial application. We fabricated disk-type piezoelectric ceramic samples by using conventional method and measured the resonance characteristics of these samples under from low to high voltage driving conditions. According to increasing the value of the input voltage, we measured the resonance frequency of the piezoelectric ceramic, and inquired into the cause of these phenomena.

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Breakdown Analysis of Piezoelectric Ceramics Using J Integral (J 적분을 이용한 압전세라믹의 절연파괴 해석)

  • Lin, Song;Kim, Yu-Hwan;Beom, Hyeon-Gyu
    • Journal of the Korean Society for Precision Engineering
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    • v.26 no.1
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    • pp.105-111
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    • 2009
  • Dielectric breakdown in piezoelectric ceramics is analyzed by using the three dimensional J integral. The J integral is shown to be a path-independent surface integral for a conductive tubular channel in a piezoelectric material. J integrals are also numerically calculated for conductive defects and tubular channels in piezoelectric ceramics through finite element analysis.

Piezoelectric properties of (1-x)(Na,K)$NbO_3$-xBa(Zr,Ti)$O_3$ ceramics with composition (조성비에 따른 (1-x)(Na,K)$NbO_3$-xBa(Zr,Ti)$O_3$ 세라믹스의 압전 특성)

  • Lee, Young-Hie;Lee, Dong-Hyun;Bae, Seon-Gi;Lee, Sang-Chul;Choi, Dal-Hae
    • Proceedings of the KIEE Conference
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    • pp.1436-1437
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    • 2011
  • (1-x)(Na,K)$NbO_3$-xBa(Zr,Ti)$O_3$ lead free piezoelectric ceramics were synthesized to enhance the piezoelectric properties of (Na,K)$NbO_3$. The synthesis and sintering method were the conventional solid state reaction method and general sintering method in air atmosphere. We report the improved piezoelectric properties in the perovskite structure composed of the NKN and BZT ceramics. We investigated the effects of NKN, BZT on the structural and electrical properties of the NKN-BZT ceramics. The NKN-BZT ceramics show good performance with piezoelectric constant $d_{33}$=155pC/N. The results reveal that (1-x)(Na,K)$NbO_3$-xBa(Zr,Ti)$O_3$ ceramics are promising candidate materials for lead-free piezoelectric application.

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Piezoelectric and Dielectric Properties of (Na,K)(Nb,Sb)$O_3$ Ceramics According to the Amount of $Bi_2O_3$ Addition ($Bi_2O_3$ 첨가에 따른 (Na,K)(Nb,Sb)$O_3$ 세라믹스의 압전 및 유전 특성)

  • Lee, Sang-Ho;Yoo, Ju-Hyun;Jeong, Yeong-Ho;Park, Yong-Wook
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.305-305
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    • 2010
  • In this study, in order to develop excellent lead free piezoelectric ceramics for piezoelectric transformer application (Na,K)(Nb,Sb)$O_3$ ceramics were fabricated using conventional oxides mixed method and their piezoelectric and dielectric characteristics were investigated according to the amount of $Bi_2O_3$ addition.

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Structural and piezoelectric properties of lead-free (1-x)$(Na_{0.5}\;K_{0.5})NbO_3$-xBa($Ti_{0.9}$, $Sn_{0.1}$)$O_3$ ceramics

  • Cha, Yu-Jeong;Nam, San;Kim, Chang-Il;Jeong, Yeong-Hun;Lee, Yeong-Jin;Baek, Jong-Hu
    • Proceedings of the Materials Research Society of Korea Conference
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    • pp.33.1-33.1
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    • 2009
  • Lead-free (1-x)$(Na_{0.5}K_{0.5})NbO_3$-xBa($Ti_{0.9}Sn_{0.1})O_3$ [NKN-BTS-100x] ceramics doped with 1 mol% $MnO_2$ have been prepared by the conventional solid state method and their structural and piezoelectric properties were investigated. The NKN-BTS-100x ceramics exhibited a dense and homogeneous microstructure when they were sintered at $1030-1150^{\circ}C$. Grain growth was observed for the specimen sintered at relatively low temperature of $1050^{\circ}C$. A tetragonal/orthorhombic morphotropic phase boundary (MPB) in the perovskite structure was also appeared for the NKN-BTS-100x ceramics (0.04$1050^{\circ}C$. The enhanced piezoelectric properties in the NKN-BTS ceramics with a MPB composition were obtained. Especially, for the NKN-BTS-6 ceramics, a high dielectric constant (${\varepsilon}^T_3/\varepsilon_0=1,400$), piezoelectric constant ($d_{33}=237$) and electromechanical coupling factor ($k_p=0.42$) were obtained.

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Dielectric and Piezoelectric Properties of (Na,K,Li)(Nb,Sb,Ta)O3 Ceramics as a Function of CuO Addition (CuO 첨가에 따른 (Na,K,Li)(Nb,Sb,Ta)O3 세라믹스의 유전 및 압전 특성)

  • Lee, KabSoo;Kim, YouSeok;Yoo, JuHyun;Mah, Sukbum
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.27 no.10
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    • pp.630-634
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    • 2014
  • $(Na_{0.525}K_{0.4425}Li_{0.0375})(Nb_{0.9975}Sb_{0.065}Ta_{0.0375})O_3+0.3 wt%CoO$ ceramics were fabricated as a function of CuO addition by traditional solid state sintering process in order to develop excellent lead-free piezoelectric ceramics composition. The addition of CuO in the LNKNTS composition ceramics can effectively enhance the densification of the ceramics, resulting in the oxygen vacancies as hardening effect. The excellent piezoelectric properties of electromechanical coupling factor($k{\small}_P$) of 0.378, piezoelectric constant($d_{33}$) of 152 pC/N were obtained from the 1.0 mol% CuO doped LNKNTS ceramics sintered at $1,020^{\circ}C$ for 3 h.

Microstructure and Piezoelectric Properties of (Na,K)NbO3 System Ceramics Substituted with BNKZ (BNKZ치환된 (Na,K)NbO3계 세라믹스의 미세구조 및 압전 특성)

  • Han, Jong-Dae;Yoo, Ju-Hyun
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.30 no.10
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    • pp.637-640
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    • 2017
  • In this study, $(1-x)(Na_{0.52}K_{0.443}Li_{0.037})(Nb_{0.883}Sb_{0.08}Ta_{0.037})O_3-x(Bi_{0.5}(Na_{0.7}K_{0.3})_{0.5}ZrO_3$ ceramics were fabricated by BNKZ substitution using a conventional solid-state method to develop excellent lead-free piezoelectric ceramics for piezoelectric actuators; their dielectric and piezoelectric properties were then investigated. All specimens were in the orthorhombic phase. $NKL-NSTO_3$ ceramics with x=0.01 showed excellent piezoelectric properties. The density (${\rho}$), piezoelectric charge constant ($d_{33}$), planar piezoelectric coupling coefficient ($k_p$), mechanical quality factor ($Q_m$), and dielectric constant (${\varepsilon}_r$) had optimized values of $4.56g/cm^3$, 208 pC/N, 0.43, 96, and 975, respectively.

Piezoelectric and Electrical properties of KNN ceramics as a function of the Variation of Nb (Nb 변화에 따른 KNN 세라믹스의 압전 및 전기적 특성)

  • Lee, Kba-Soo;Yoo, Ju-Hyun;Kim, In-Sung;Song, Jae-Sung
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.302-302
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    • 2010
  • The lead-free piezoelectric ceramics must have high piezoelectric properties and electrical properties for the applications of piezoelectric devices. Therefore, KNN ceramics were investigated as a function of the variation of Nb. The density was increased with the increase of Nb. The density was saturated above 0.8895 mol Nb. The maximum value of electromechanical coupling coefficient(kp) was obtained 0.428 at 0.8895mol Nb. This result can be attributed to the well sintered of specimens. Also, The maximum value of mechanical quality factor(Qm) showed 1554 at 0.8895mol Nb. Therefore, this composition can be used for application of piezoelectric device such as piezoelectric transformer and piezoelectric actuator.

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