우리나라 고용량 MLCC 기술 개발의 역사와 전망

홍정오,김상혁,허강헌 한국세라믹학회 2009 한국세라믹학회지 Vol.46 No.2

MLCC (Multi-layer Ceramic Capacitor) is the most important passive component in electronic devices such as HHP, PC and digital display. The development trend of MLCC is a miniaturization with increasing the capacitance. In this paper, a development history of the high capacitance MLCC in Korea was introduced, and the necessity of the finer BaTiO₃ was explained in the viewpoint of the issued electrical and dielectric properties of high capacitance MLCC. The bottleneck technologies to realize the high capacitance was shortly introduced, followed by the prediction of the development trend of MLCC in near future. MLCC (Multi-layer Ceramic Capacitor) is the most important passive component in electronic devices such as HHP, PC and digital display. The development trend of MLCC is a miniaturization with increasing the capacitance. In this paper, a development history of the high capacitance MLCC in Korea was introduced, and the necessity of the finer BaTiO₃ was explained in the viewpoint of the issued electrical and dielectric properties of high capacitance MLCC. The bottleneck technologies to realize the high capacitance was shortly introduced, followed by the prediction of the development trend of MLCC in near future.

Numerical Analysis of Multi-Layer Ceramic Capacitor for Electric Vehicle Application

Ji Min Shin(신지민),Changwoon Han(한창운) 대한기계학회 2023 대한기계학회 춘추학술대회 Vol.2023 No.11

Yttrium이 첨가된 BaTiO₃에서 형성된 core/shell 구조에서 shell의 TCC 거동: 독립적 관찰

전상채,Jeon, Sang-Chae 한국결정성장학회 2020 한국결정성장학회지 Vol.30 No.3

MLCC(Multi-Layer Ceramic Capacitor)의 유전체 층에 사용되는 BaTiO₃ 입자는 안정한 TCC(Temperature Characteristics of Capacitance) 거동을 갖기 위해 core/shell 구조를 갖는다. 지금까지 shell의 특성은 core/shell 구조의 전체 특성에서 유추해 왔다. 이는 core/shell 구조가 겨우 수 ㎛의 작은 크기로 shell 특성만 구별해서 측정하기가 어렵기 때문이다. 본 실험에서는 micro-contact법을 이용하여 확산쌍 시편의 계면에 형성된 확대된 core/shell 구조에 Pt 전극을 증착하여 35~135℃ 에서 shell 영역의 독립적인 TCC 거동을 측정하였다. 그 결과, 65℃에서 최대 유전율 값을 갖는 완만한 피크의 확산 상전이(Diffusion Phase Transition) 거동인 core의 특성과 구별되는 거동을 관찰하였으며, 이는 core/shell 구조의 온도-유전거동을 묘사하는 모델링에서 실험 자료로 활용될 것으로 본다. Grains in the BaTiO₃, which is used for a dielectric layer in MLCC(Multi-Layer Ceramic Capacitor) are necessary to form core/shell structure for a stable TCC(Temperature Coefficient of Capacitance) behavior. The shell property has been deduced from the whole TCC behavior of core/shell structure due to its tiny size, ~ few ㎛. This study demonstrates the individual TCC behavior of the shell phase measured by micro-contact measurement in a temperature range between 35 and 135℃. Pt electrode pairs deposited on an enlarged core/shell structure in a diffusion couple sample made the measurement possible. As a result, the DPT (Diffusion Phase Transition) behavior of the shell phase was revealed as a different TCC behavior from that of the core: a broad peak with T_m at 65℃. This would be also useful experimental data for a modelling that depicts dielectric-temperature behavior of core/shell structure.

화재 · 피난시뮬레이션을 통한 MLCC 사업장 클린룸의 위험성 평가

손광태,손종영,배영훈,최준호 한국화재소방학회 2021 한국화재소방학회논문지 Vol.35 No.2

In this paper, fire and evacuation simulations are conducted for the Multi-Layer Ceramic Capacitor (MLCC) factory cleanroom, and a plan to improve performance standards in the field of performance-based design simulation is suggested. Firstof all, fire and evacuation risk factors in the clean room were derived through fire accidents and previous research. Andfire and evacuation simulations were performed using the derived risk factors as variables. As a result of the simulations,it was found that 'air conditioning equipment', 'working capacity', 'door setting method' and 'life safety evaluation method'have an influence on the life safety evaluation. Finally, a plan to improve the standards for fire and evacuation simulationwas suggested to reflect the factors influencing the life safety evaluation. 본 논문에서는 MLCC 공장 클린룸을 대상으로 화재 및 피난 시뮬레이션을 실시하고, 그 결과분석을 기반으로 성능위주설계 시뮬레이션 분야 수행기준의 개선방안을 제시하고자 한다. 우선 화재사고사례 및 선행연구의 고찰을 통해 클린룸의 화재⋅피난위험요인을 도출하였으며, 도출된 위험요인을 변수로 화재⋅피난시뮬레이션을 수행하였다. 시뮬레이션 수행결과 ‘공조설비 작동여부’, ‘근무인원의 수’, ‘출구설정 방법’과 ‘인명안전성 평가방법’이 인명안전성평가에 영향을 미치는 것으로 나타났으며, 최종적으로 본 논문에서는 인명안전성 평가에 영향을 미치는 요인들을반영하기 위한 화재 및 피난시뮬레이션 수행기준의 개선방안을 제시하였다.

Finite Element Analysis of Multi-Layer Ceramic Capacitors Improved Self-heating for High Reliability

이창호,윤중락 한국전기전자재료학회 2021 Transactions on Electrical and Electronic Material Vol.22 No.4

Heat generation with decrease in multilayer ceramic capacitor (MLCC) device size proves problematic in various fields. Herein, we performed heating temperature measurements according to various MLCC sizes and several finite element analysis (FEA) simulations to improve the self-heating characteristics. For the experiments, 1005, 1608, and 2012 size MLCCs with a 1-μF capacitance were selected, and temperature changes were measured using a ripple current test at 10 kHz. Thethermal resistance ( Rt ) and equivalent series resistance (ESR) of the 1005, 1608, and 2012 MLCCs were determined to be 94 °C/W and 92 mΩ, 86 °C/W and 69 mΩ, and 82 °C/W and 37 mΩ, respectively. The experimental results confi rm that theESR value and MLCC size signifi cantly infl uence thermal resistance due to ripple current. To improve the heat generation characteristics due to ripple current, an FEA model was constructed considering the dielectrics, conductors, and design parameter characteristics to verify the temperature changes according to ESR and MLCC size. After application of ripple current from the measured ESR value through the ANSYS Maxwell 3D software, the extracted ohmic loss value was converted to the ANSYS Icepak software to verify the temperature change value. Resultantly, a measured temperature change and simulation result error range of within 1% were obtained. For MLCC incorporation in applications such as 5G network equipment and electric vehicles, considering reliability characteristics, the internal stress and heat fl ux values were analyzed using the ANSYS mechanical software as per temperature change according to MLCC size, volume, and ripple current. The results confi rmed that with MLCC volume increase, the internal heat fl ux increased according to the temperature change, temperature increase was suppressed owing to the smooth heat fl ux, and the internal stress appeared smaller.

Paste 박막 건조과정에 대한 연구

양시영(Si-Young Yang) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5

The ability to predict the drying behavior of thin film and coating is one of the great importance things to the electronic products industry. The drying of volatile solvents from a printed film is a complicated process since it involves simultaneous heat and mass transfer controlled by complex transport and thermodynamic behavior of paste solutions. In conventional drying process, a continuous layer of paste solution is deposited onto a permeable substrate of ceramic coating, which is dried in a furnace with forced air convection. High velocity impinging air jets are commonly used to accelerate the evaporative paste drying process, due to the high heat and mass transfer rate in which are developed in the impingement region. In this work, test system was developed to measure the total residual solvent level. Also, a model was developed to describe the drying behavior of multi-component paste solutions deposited on the permeable substrate. The predictions from the models provide detailed information about the relative importance of internal and external resistances to drying, effect of operating conditions, effect of multi-zone approach, as well as sensitivity of all physical properties on the drying rate. The validity of the model was confirmed by comparing predictions with the drying data available in the literature and the collected in our experiments. The experimental data and the simulation results are in good agreement.

유한요소모델을 통한 PCBA 제품 진동 및 음향 해석

김현우(Hyun-Woo Kim),김동준(Dong-Joon Kim),박노철(No-Cheol Park),박영필(Young-Pil Park) 대한기계학회 2017 대한기계학회 춘추학술대회 Vol.2017 No.11

For predicting the vibration and acoustic noise of the printed circuit board assembly(PCBA) products during operation, a finite element model of a solid state drive(SSD) coupled with the multi-layer ceramic capacitors(MLCCs) which excite the substrate is required. In this study, the finite element model of the SSD was constructed considering multi-layer printed circuit board(PCB) and major components, devices, and solder balls. Afterwards, the model was verified through the modal assurance criterion(MAC) and the natural frequencies. Finally the voltage signal was inputted to the bulk MLCCs according to the operation state of the SSD, and the harmonic and acoustic simulation were performed.

Electrochemical Metallic Ion Migration Property of Multi-Layer Ceramic Capacitor for Car Electronics

Won Sik Hong,Mi-Song Kim,Joo Young Bae,So-Hee Hyun,배희훈,경준석,박은정,김종을,오주석 대한용접접합학회 2023 대한용접·접합학회지 Vol.41 No.6

As the use of electrical components in automobiles increases, the occurrence of electorchemical metallic ion migration (ECM), which is one of the causes of various failures in electrical components, is also increasing. Therefore, in this study, 1608 MLCC chip components were used for temperature-humidity-bias (THB) tests at 65℃/85%R.H., 65℃/95%R.H., and 85℃/85%R.H. Three types of THB tests were conducted for 2,934 h. For the THB test, voltages of 3.3, 12 and 24 V were applied, and real-time resistance of MLCCs were measured at every 40 mms intervals. During the ECM test, the ECM occurrence time was measured by monitoring the insulation resistance of between the electrode of MLCC under each THB test conditions. The failure criteria for ECM occurrence were 106 Ω or less, and the time when it occurred more than twice was judged as the ECM failure criteria. Based on the ECM occurrence time, the mean life time of ECM occurrence according to temperature, humidity and applied voltage conditions was derived through Weibull statistical analysis. Finally, we compared and analyzed the sensitivity of MLCC components to ECM generation under use environment of automotive electronics.

RF Magnetron 스퍼터링법으로 성장시킨 Ba($Zr_{0.2}Ti_{0.8}$)$O_3$ 박막의 특성

최원석,장범식,김진철,박태석,이준신,홍병유 한국전기전자재료학회 2001 전기전자재료학회논문지 Vol.14 No.7

We investigated the structural and electrical properties of Ba(Zr$_{x}$Ti$_{1-x}$ )O$_3$(BZT) thin films with a mole fraction of x=0.2 and a thickness of 150 nm. BZT films were prepared on Pt/SiO$_2$/Si substrate with the various substrate temperature by a RF magnetron sputtering system. When the substrate temperature was above 50$0^{\circ}C$, we obtained multi-crystalline BZT films oriented to (110), (111), and (200) directions. As the substrate temperature increases, the films are crystallized and their dielectric constants become high. C-V characteristic curve of the film deposited at high temperature is more sensitive than that of the film deposited at low temperature. The parameters of the BZT film are as follows; the dielectric constants(dissipation factors) at 1 MHz are 95(0.021), 140(0.024), and 240(0.033) deposited at 400, 500, $600^{\circ}C$, respectively; the leakage currents at 666.7 kV/cm are 5.73, 23.5, and 72.8x10$^{-8}$ A/$\textrm{cm}^2$ fo the films deposited at 400, 500, and 600 $^{\circ}C$, respectively; the leakage currents at 666.7kV/cm are 5.73, 23.5, and 72.8x10$^{-8}$ A/$\textrm{cm}^2$ for the films deposited at 400, 500, $600^{\circ}C$, respectively. The BZT film deposited at 40$0^{\circ}C$ shows stable electrical properties, but dielectric constant for application is a little small.ll.

지구 관측용 저궤도 위성을 위한 상용 칩 타입 적층 세라믹 커패시터 적용방안

김주나,김영석 한국항공우주학회 2014 한국항공우주학회 학술발표회 논문집 Vol.2014 No.11

저궤도 위성의 개발 특성상 짧은 개발기간, 소형화, 비용 등의 제약사항에 따라 상용부품 적용사례는 갈수록 늘어나고 있다. 이 중에서도 수동소자들은 제작 공정이 과거에 비해 매우 안정화 되고 있어서 상용 등급의 부품이어도 부품의 신뢰도가 높은 편이다. 본 논문에서는 상용 칩 타입 적층 세라믹 커패시터를 저궤도 위성에 적용하기 위해서 우주 급 부품과 상용 부품의 품질 확인을 위한 테스트 항목을 비교 검토하고, 실제 우주 환경에서의 부품의 주요 실패원인과 함께 커패시터의 주요 실패 메커니즘을 분석하였다. 이를 통해 부품의 품질 등급도 중요하지만, 부품의 제작과 선정, 취급에 관련한 스트레스가 부품의 실패에 더 큰 영향을 미치는 것을 확인하였으며, 이를 보완하기 위한 방안을 제시하였다. 이러한 선정 방식은 두바이샛 1 호를 통해 타당성이 입증되었다. Recently, the use of commercial grade components in the LEO satellite development program are increased due to the demand of short development periods, compact sizes, cheap prices, etc. The manufacturing processes of passive components are very stable compared to the past, and their products have high reliability even though they are commercial grade. In order to use the commercial grade MLCC (Multilayer Ceramic Capacitor) in the LEO satellite project, comparing of capacitor grade and test level are conducted, major failure mechanisms are identified, and provide a selection & precaution guideline to reduce failure probability in the LEO satellite application. This selection guideline is verified through the successful operation of the Dubaisat-1 satellite.