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

  • 제46권3호
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  • Pages.15-22
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  • 2023
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  • 2005-0461(pISSN)
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  • 2287-7975(eISSN)
한국산업경영시스템학회 (Society of Korea Industrial and System Engineering)
권호 표지
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바이오 메디컬용 코어-쉘 구조의 Bi0.5(Na0.78K0.22)0.5TiO3계 무연압전세라믹 소재의 개발

Development of Bi0.5(Na0.78K0.22)0.5TiO3 Lead-free Piezoelectric Ceramic Material with Core-shell Structure for Biomedical

  • 윤성준 (전북대학교 일반대학원 융합기술경영학과(MOT)) ;
  • 배준수 (전북대학교 일반대학원 융합기술경영학과(MOT))
  • Seong-jun Yun (Graduate School of Technology Management, Jeonbuk National University) ;
  • Joonsoo Bae (Graduate School of Technology Management, Jeonbuk National University)
  • 투고 : 2023.07.08
  • 심사 : 2023.08.01
  • 발행 : 2023.09.30
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초록

BNKT Ceramics, one of the representative Pb free based piezoelectric ceramics, constitutes a perovskite(ABO3) structure. At this time, the perovskite structure (ABO3) is in the form where the corners of the octahedrons are connected, and in the unit cell, two ions, A and B, are cations, A ion is located at the body center, B ion is located at each corner, and an anion O is located at the center of each side. Since Bi, Na, and K sources constituting the A site are highly volatile at a sintering temperature of 1100℃ or higher, it is difficult to maintain uniformity of the composition. In order to solve this problem, there should be suppression of volatilization of the A site material or additional compensation of the volatilized. In this study, the basic composition of BNKT Ceramics was set to Bi0.5(Na0.78K0.22)0.5TiO3 (= BNKT), and volatile site (Bi, Na, and K sources) were coated in the form of a shell to compensate additionally for the A site ions. In addition, the physical and electrical properties of BNKT and its coated with shell additives(= @BNK) were compared and analyzed, respectively. As a result of analyzing the crystal structure through XRD, both BNKT(Core) and @BNK(Shell) had perovskite phases, and the crystallinity was almost similar. Although the Curie temperature of the two sintered bodies was almost the same (TC = 290 ~ 300 ℃), it was confirmed that the d33 (piezoelectric coefficient) and Pr (residual polarization) values were different. The experimental results indicated that the additional compensation for a shell additive causes the coarsening, resulting in a decrease in sintering density and Pr(remanent polarization). However, coating shell additives to compensate for A site ion is an effective way to suppress volatilization. Based on these experimental results, it would be the biggest advantage to develop an eco-friendly material (Lead-free) that replaced lead (Pb), which is harmful to the human body. This lead-free piezoelectric material can be applied to a biomedical device or products(ex. earphones (hearing aids), heart rate monitors, ultrasonic vibrators, etc.) and skin beauty improvement products (mask packs for whitening and wrinkle improvement).

키워드

과제정보

This study received technical advice and guidance from Jeong Kyeong-won, CEO of IMTS Co., Ltd. while I serving as CEO of Sincerus Materials Co., Ltd. in 2016, and obtained a piezoelectric coefficient value (d33) of 260pm/V in 2019, and 300pm, which can be considered a commercialization level. Research experiments began in earnest to obtain values higher than 300pm/V. In order to find the optimal BNKT composition ratio, with the help of Dr. Chang-Young Koo of Quintes Co., Ltd., the result of continuous research and experiments along with application, advice, and guidance of already commercialized lead-free piezoelectric liquid (sol-gel) technology was 310.59 in March 2023. It was possible to obtain the piezoelectric coefficient (d33) value of pm/V. Lab researchers who worked with us to achieve successful research experiments and obtain quantitative target values (piezoelectric coefficient, d33) at the level required by the biomedical market, and Jeong Gyeong-won of IMTS Co., Ltd., who served as a bridge for us to be introduced to and encounter this technology for the first time. We would like to express our deepest gratitude to Dr. Chang-Young Koo, CEO of Quintes Co., Ltd., for providing technical support and guidance through the research and development of lead-free piezoelectric ceramic materials for low-temperature firing with a core-shell structure and ultimately successful commercialization. This study has been supported by MOTIE funding program "Advanced Graduate Education for Management of Convergence Technology".

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