• Title/Summary/Keyword: Piezoelectric Ceramics

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Driving Characteristics and Modeling of Ultrasonic Nozzle Driving Circuit (초음파 노즐구동회로의 모델링과 동작특성)

  • Lee, Sang-Ho;Kim, Hwa-Soo;Hwang, Lak-Hoon;Yoo, Ju-Hyun;Kim, Kook-Jin
    • Proceedings of the KIEE Conference
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    • 2006.10a
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    • pp.79-80
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    • 2006
  • In this paper, ultrasonic nozzle and driving circuit were manufactured and their electrical properties were investigated. Uitrasonic nozzle was fabricated using PSN-PMN-PZT ceramics showing excellent piezoelectric characteristics. In order to drive ultrasonic nozzle, PWM controller(KA3525A) was used. With increasing input voltage of nozzle, particle diameters of diesel were increased up tot 16V and then decreased. At the input voltage of 12V, volume particle diameter showed the minimum value of $37.3{\mu}m$ and also at the input voltage of 18V, volume particle diameter showed the maximum value of $51.3{\mu}m$.

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Incidence Angle Estimation by the Tonpilz Type Underwater Acoustic Vector Sensor with a Quadrupole Structure (Quadrupole 구조를 가진 Tonpilz형 수중 음향 벡터 센서를 이용한 입사각 추정)

  • Lim, Youngsub;Roh, Yongrae
    • The Journal of the Acoustical Society of Korea
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    • v.31 no.8
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    • pp.569-579
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    • 2012
  • Typical Tonpilz type underwater acoustic transducers making use of piezoelectric ceramics detect the magnitude of an acoustic pressure, a scalar quantity, and convert this pressure into a proportional output voltage. The scalar sensor has no directional sensitivity. In this paper, we have proposed a new vector sensor based on the Tonpilz transducer structure, which is sensitive to both the magnitude and the azimuthal direction of an acoustic wave. Validity of this new design has been confirmed with analytic equations and finite element analyses.

The effects of $Cr_2O_3$ addition on piezoelectric characteristics of $Pb(Mn_{1/3}Nb_{2/3})O_3+PZT$ ceramics for substrates of high-frequency devices (고주파소자의 기판용 $Pb(Mn_{1/3}Nb_{2/3})O_3+PZT$ 세라믹스의 압전특성에 $Cr_2O_3$의 첨가가 미치는 영향)

  • 이개명;백동수;윤석진;홍재일;박창엽
    • Electrical & Electronic Materials
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    • v.5 no.1
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    • pp.14-27
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    • 1992
  • 핫프레스법으로 제작된 0.05Pb(M $n_{1}$3/N $b_{2}$3/) $O_{3}$+ 0.95Pb(Z $r_{0.47}$ $Ti_{0.53}$) $O_{3}$ 세라믹스에 있어서 C $r_{2}$ $O_{3}$의 첨가량이 그 시편의 구조적특성, 유전특성, 압전특성, 온도안정성 및 포아손비에 미치는 영향이 조사되었다. C $r_{2}$ $O_{3}$의 첨가량의 범위가 0.3~0/75[wt%]인 시편만이 포아손비가 1/3이상으로 주파수저하형 에너지포획소자의 기판으로 사용될 수 있으며 이 중에서 C $r_{2}$ $O_{3}$의 첨가량이 0.5[wt%]인 시편이 보다 우수한 압전특성과 안정된 주파수 온도특성을 갖고 있다. 있다.

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The Design Simulation for Manufacture of High Frequence Ceramic Filter (고주파용 세라믹 필터의 제작을 위한 디자인 해석)

  • 이수호;석정영;류기흥;사공건;윤광희;류주현;박창엽
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2001.11a
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    • pp.418-421
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    • 2001
  • The ceramic filters were developed using technology similar to that of quartz crystal and electro- mechanical filter. However, the key to this development involved the theoretical analysis of vibration modes and material improvements of piezoelectric ceramics. The primary application of ceramic filters has been for consumer-market use. Accordingly, a major emphasis has involved mass production technology, leading to low-priced devices. A typical ceramic filter includes monolithic resonators and capacitors packaged in unique configurations. Nakazawa developed a double-mode resonator as two acoustically coupled single resonators. And he developed 10.7MHz crystal filters using multi-energy trapping mode of thickness shear vibration. He succeeded in realizing a two-pole band pass filter response without external inductance by splitting a dot electrode to creak coupled symmetric and anti- symmetric vibration modes. Accordingly, the simulation for ceramic (inter were important. So that, this paper were investigated the pass frequency of filter on the electrode length and thickness of ceramic.

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Piezoelectric characteristics of PZT-PFN and $Cr_2O_3$ modified PZT-PFN ceramics used in high power transducer (고출력 변환기용 PZT-PFN계 및 $Cr_2O_3$ 변성 PZT-PFN계의 압전특성)

  • 손은영;박창엽;홍재일
    • Electrical & Electronic Materials
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    • v.3 no.4
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    • pp.279-286
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    • 1990
  • 고출력 변환기재료로 이용하기 위하여 유전손실에 기인한 압전 특성의 열화를 방지할 수 있는 큐리점이 비교적 높은 Pb$_{2}$FeNbO$_{6}$의 제3성분을 PZT에 고용한 고용체에서 양호한 압전특성을 갖는 조성을 찾고, 기계적 품질계수를 개선하고자 Cr$_{2}$O$_{3}$를 첨가한 변성 3성분계에 대하여 조사하였다. 그 결과, 전기기계결합계수가 가장 큰 조성은 0.05Pb(FeNb)O$_{3}$-0.4275PbTiO$_{3}$-0.5225 PbZrO$_{3}$이었으며 이조성의 기계적 품질계수, 상전이점은 170, 399.deg.C이었으며 이조성에 0.1wt% Cr$_{2}$O$_{3}$첨가한 변성 3성분계의 기계적 품질계수는 320으로 개선되었다.

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New Design of Wind-Mill Type Ultrasonic motor with High Torque (고토크를 내는 풍차형 초음파 전동기의 새로운 설계)

  • 김우태;김진수
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2000.11a
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    • pp.181-183
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    • 2000
  • Ultrasonic Motors of Wind-Mill type(diameter in 11.35mm, thickness in 2.8mm, and 1.44g weight) using Piezoelectric Ceramics have been developed. In recent study, Maximum torque in 100$V_{max}$, 105.8kHz was 7.2 ${\mu}$N$.$m, and bidirectional revolution using single-phase AC was presented. However, it is difficult to use because of small torque. Thus, in present study, new type of Wind -Mill Type Ultrasonic Motor of was designed as stator' structure was changed

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Effect of Residual Binder on Grain Growth during Sintering of $Pb(Mg_{1/3}Nb_{2/3})O_3-PbTiO_3$

  • Yun, Jung-Yeul;Jang, Wook-Kyung;Jeon, Jae-Ho;L.Kang, Suk-Joong
    • Proceedings of the Korean Powder Metallurgy Institute Conference
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    • 2006.09a
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    • pp.209-210
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    • 2006
  • Organic binders are usually pre-mixed with ceramic powders to enhance the formability during the shape forming process. These binders, however, must be eliminated before sintering in order to avoid pore formation and unusual grain growth during sintering. The present work was performed to investigate the effects of residual binder on grain growth behavior during sintering of $Pb(Mg_{1/3}Nb_{2/3})O_3-PbTiO_3$ piezoelectric ceramics. The microstructures of sintered samples were examined for various thermal processes and atmosphere at debinding. Addition of binder seems to promote abnormal grain growth especially in incompletely debinded regions and to make the grain shape change from corner-rounded to faceted.

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Driving Characteristics of Multilayer Actuator Structured-Ultrasonic Nozzle (적층 액츄에이터형 초음파 노즐의 구동특성)

  • Kim, Hwa-Soo;Hwang, Lark-Hoon;Kim, Kook-Jin;Yoo, Ju-Hyun;Hong, Jae-Il
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2007.11a
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    • pp.251-252
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    • 2007
  • In this paper, in order to spray diesel fuel, multilayer actuator structured-ultrasonic nozzle and resonant inverter were manufactured. Multilayer actuator structured-ultrasonic nozzle as fabricated using PMN-PNN-PZT ceramics showing excellent piezoelectric characteristics. Its electrical and temperature properties were measured for investigating he applicability of stable ultrasonic nozle for spraying diesel fuel.

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Optimum Driving Characteristics of U1trasonic Nozzle (초음파 노즐의 최적 구동 특성)

  • Kim, Hwa-Soo;Lee, Sang-Ho;Hwang, Lak-Hoon;Yoo, Ju-Hyun;Kim, Kook-Jin
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2007.06a
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    • pp.272-273
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    • 2007
  • In this paper, ultrasonic nozzle and driving circuit were manufactured, respectively. And then, their electrical properties. were investigated. Ultrasonic nozzle was fabricated using PSN-PMN-PZT ceramics showing excellent piezoelectric characteristics. In order to drive ultrasonic nozzle, PWM controller(KA3525A) was used. The purpose of this study is to find the optimal driving condition of ultrasonic. nozzle. Accordingly electrical and temperature characteristic of ultrasonic driving system were investigated as a function of the input voltage.

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Piezoelectric Properties of Low Temperatrue PMN-PZT Ceramics with Attrition Milling time (Attrition milling 시간에 따른 저온소결 PMN-PZT 세라믹스의 압전특성)

  • Lee, Hyun-Seok;Yoo, Ju-Hyun;Jung, Young-Ho
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2006.06a
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    • pp.300-300
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    • 2006
  • 일반적으로 PZT계 세라믹스는 높은 결정격자 이방성을 가지고 있으며, 우수한 압전특성을 가지고 있다. 이러한 특성을 보이기 위해서는 높은 온도($1200^{\circ}C$)에서 소결을 해야하기 때문에 PbO의 휘발로 인하여 환경문제가 야기되고 있다. 이러한 문제를 해결하기 위해서 Li, Na같은 액상소결제를 첨가시켜 소결온도를 낮추는 연구를 하고 있다. 본 연구에서는 $Pb(Mn_{1/3}Nb_{2/3})O_3$-PZT세라믹스가 갖는 높은 결정격자 이방성을 유지시키고, 저온소결시 압전 및 유전특성을 향상시키기 위해서 $Pb(Mg_{1/2}W_{1/2})O_3$를 치환시켜 attrition milling 시간에 따른 PWM-PMN-PZT세라믹스의 압전특성을 조사하였다.

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