Journal of Korean Society of Industrial and Systems Engineering (산업경영시스템학회지)

Society of Korea Industrial and System Engineering (한국산업경영시스템학회)
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A Study on Improving the Characteristics of Lead-free Piezoelectric Ceramic Materials Applicable to IT and BT Converged Products

IT와 BT 융복합 제품에 적용 가능한 무연압전세라믹소재의 특성 개선에 관한 연구

  • Seongjun Yun (Graduate School of Technology Management, Jeonbuk National University) ;
  • Joonsoo Bae (Graduate School of Technology Management, Jeonbuk National University)
  • 윤성준 (전북대학교 일반대학원 융합기술경영학과(MOT)) ;
  • 배준수 (전북대학교 일반대학원 융합기술경영학과(MOT))
  • Received : 2024.07.12
  • Accepted : 2024.07.30
  • Published : 2024.09.30
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Abstract

In this study, an attempt was made to approximate the main characteristic values of Bi0.5(Na0.78K0.22)0.5TiO3 (= BNKT) depending on the content of Fe2O3 additives, aiming to approach the values of lead(Pb) piezoelectric ceramic materials (PZT). Specifically, when the piezoelectric coefficient (d33) value of lead(Pb) piezoelectric ceramic material (PZT polycrystalline ceramic powder) is 300[pC/N] or higher, it is applied for hard purposes such as ultrasonic welding machines and cleaning machines, and when it exceeds 330[pC/N], it is applied for soft purposes like piezoelectric sensors. In this study, research and development were conducted for devices with a piezoelectric coefficient (d33) of 300[pC/N] or more for actuators. For this purpose, K+ exceeding 0.02 to 0.12 mol% was added to (Na0.78K0.22)0.5Bi0.5TiO3 to analyze structural changes due to K+ excess, and (Na0.78K0.22)0.5Bi0.5TiO3 + 8mol% K2CO3 Ti4+ was substituted with Fe3+ to manufacture lead-free piezoelectric materials. As a result, ceramics with Fe3+ substitution at x = 0.0075 yielded an average value of d33 = 315[pC/N]. Furthermore, for ceramics with Fe3+ substitution at x = 0.0075, the average values of maximum polarization (Pmax), residual polarization (Prem), and coercive field (Ec) were found to be 39.63 μC/cm2, 30.45 μC/cm2, and 2.50 kV/mm, respectively. The reliable characteristic values obtained from the research results can be applied to linear actuator components (such as the zoom function of mobile cameras, LDM for skin care, etc.) and ultrasonic vibration components.

Keywords

Acknowledgement

This study was supported by MOTIE funding program "Advanced Graduate Education for Management of Convergence Technology". And it was a collaborative research and development effort between Piezo Technology Co., Ltd. and the Korea Institute of Ceramic Engineering and Technology (KICET). Special thanks to Dr. Cho Jung-ho from KICET for his invaluable role in facilitating access to and understanding of this technology, as well as to the CEO and the director of the research lab at Piezo Technology Co., Ltd. Additionally, I would like to express my gratitude to Park Nam-joo, CEO of 1stnoon Co., Ltd. and Kim Bo-min, CEO of Mosterelect Co., Ltd., who make this research more valuable in the future application.

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