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한국전기전자재료학회> 전기전자재료학회논문지(J. Korean Inst. Electr. Electron. Mater. Eng.)> 브러쉬 코팅 공정을 이용한 용액 기반 BiAlO 박막의 제작과 액정 소자에의 응용

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브러쉬 코팅 공정을 이용한 용액 기반 BiAlO 박막의 제작과 액정 소자에의 응용

Fabrication of the Solution-Derived BiAlO Thin Film by Using Brush Coating Process for Liquid Crystal Device

이주환 ( Ju Hwan Lee ) , 김대현 ( Dai-hyun Kim )
  • : 한국전기전자재료학회
  • : 전기전자재료학회논문지(J. Korean Inst. Electr. Electron. Mater. Eng.) 34권5호
  • : 연속간행물
  • : 2021년 09월
  • : 321-326(6pages)
전기전자재료학회논문지(J. Korean Inst. Electr. Electron. Mater. Eng.)

DOI


목차

1. 서 론
2. 실험 및 공정
3. 결과 및 고찰
4. 결 론
REFERENCES

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We fabricated BiAlO thin film by a solution process with a brush coating to be used as liquid crystal (LC) alignment layer. Solution-processed BiAlO was coated on the glass substrate by brush process. Prepared thin films were annealed at different temperatures of 80℃, 180℃, and 280℃. To verify whether the BiAlO film was formed properly, X-ray photoelectron spectroscopy analysis was performed on Bi and Al. Using a crystal rotation method by polarized optical microscopy, LC alignment state was evaluated. At the annealing temperature of 280℃, the uniform homogenous LC alignment was achieved. To reveal the mechanism of LC alignment by brush coating, field emission scanning electron microscope was used. Through this analysis, spin-coated and brush coated film surface were compared. It was revealed that physical anisotropy was induced by brush coating at a high annealing temperature. Particles were aligned in one direction along which brush coating was made, resulting in a physical anisotropy that affects a uniform LC alignment. Therefore, it was confirmed that brush coating combined with BiAlO thin film annealed at high temperature has a significant potential for LC alignment.

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간행물정보

  • : 공학분야  > 전기공학
  • : KCI등재
  • :
  • : 격월
  • : 1226-7945
  • : 2288-3258
  • : 학술지
  • : 연속간행물
  • : 1988-2022
  • : 4601


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발행기관 : 한국전기전자재료학회 간행물 : 전기전자재료학회논문지(J. Korean Inst. Electr. Electron. Mater. Eng.) 35권 1호 발행 연도 : 2022 페이지 : pp. 1-10 (10 pages)

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Two-dimensional materials have shown a great promise for the next-generation electronic materials due to their unique optical, physical, and chemical properties that are distinct from their bulk counterparts. Their atomic-level thickness, the feature for flexible tenability, and exposed huge surface allow various approaches for high-performance nanoscale devices. Especially, this review highlights the recent progress on two-dimensional dielectric nanosheets, which are obtained by cheap and mass-producible solution-based exfoliation process, accompanied by the preparation methods, various deposition methods, and the characteristics of devices using a dielectric nanosheet thin films. We also present a perspective on the advantages offered by this two-dimensional dielectric nanosheets for the upcoming future nanoelectonics.

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발행기관 : 한국전기전자재료학회 간행물 : 전기전자재료학회논문지(J. Korean Inst. Electr. Electron. Mater. Eng.) 35권 1호 발행 연도 : 2022 페이지 : pp. 11-17 (7 pages)

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Direct exposure to toxic and hazardous gases has always been considered as the most pervasive problem worldwide, leading to a gradual increase in the number of asthma patients due to NOx/SOx gases inhaling and exposure to 50 ppm formaldehyde gases. Therefore, the development of accurate gas sensors is a key issue for resolving these problems. To address such issues, the development of membranes for selective filtering of target molecules as well as nanocatalyst for enhancing the sensing selectivity is highly crucial. In this review, the research progress for porous membrane materials (e.g. MOFs, and graphene) and nanocatalyst technology for the development of selective and accurate gas sensors will be discussed.

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3이젯 프린터를 사용한 고분자/퀀텀닷 마이크로 패터닝 공정

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발행기관 : 한국전기전자재료학회 간행물 : 전기전자재료학회논문지(J. Korean Inst. Electr. Electron. Mater. Eng.) 35권 1호 발행 연도 : 2022 페이지 : pp. 18-23 (6 pages)

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이젯 프린팅은 직접적인 비접촉 마이크로 팹기술의 하나로서 노즐과 기판 사이에 강한 전기장을 가함으로써 넓은 범위의 마이크로/나노패턴 어레이를 구현할 수 있는 다목적 팹공정이다. 제조된 고분자/퀀텀닷 마이이크로 패턴의 모양과 두께는 자동화된 프린트 기계에 설치된 노즐 직경과 공정에 사용된 잉크 성분에 일반적으로 정밀한 의존성을 갖는다. 본 논문의 목적은 실험 결과에 영향을 미칠 수 있는 각각의 공정 변수 효과를 설명하기 위해서 이젯 프린팅된 고분자/퀀텀닷의 전형적인 실제 예를 설명하는데 있다. 여기서 우리는 마이크로/나노 해상도로 두께가 정밀하게 제어된 고분자/퀀텀닷 패턴을 제조할 수 있는 몇 가지 이젯 프린팅 공정을 구현하였다.


Electrohydrodynamic jet (e-jet) printing, a type of direct contactless microfabrication technology, is a versatile fabrication process that enables a wide range of micro/nanopattern arrays by applying a strong electric field between the nozzle and the substrate. In general, the morphology and the thickness of polymers/quantum dot micropatterns show a systematic dependence on the diameter of the nozzle and the ink composition with a fully automated printing machine. The purpose of this report is to provide typical examples of e-jet printed micropatterns of polymers/quantum dots to explain the effect of each process variable on the result of experiments. Here, we demonstrate several operating conditions that allow high-resolution printing of layers of polymers/quantum dots with a precise control over thickness and submicron lateral resolution.

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4Li2CO3와 B2O3를 첨가한 Bi1/2Na1/2TiO3-SrTiO3 무연 압전 세라믹스의 저온 소성 연구

저자 : 이상섭 ( Sang Sub Lee ) , 박영석 ( Young-seok Park ) , 즈엉짱안 ( Trang An Duong ) , 무클리샤아이샤데비타 ( Mukhlishah Aisyah Devita ) , 한형수 ( Hyoung-su Han ) , 이재신 ( Jae-shin Lee )

발행기관 : 한국전기전자재료학회 간행물 : 전기전자재료학회논문지(J. Korean Inst. Electr. Electron. Mater. Eng.) 35권 1호 발행 연도 : 2022 페이지 : pp. 24-31 (8 pages)

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This study investigated microstructures, crystal structures, polarization, dielectric and electromechanical properties of 0.76Bi1/2Na1/2TiO3-0.24SrTiO3 (BNT-24ST)-based piezoceramcs by adding Li2CO3 and B2O3 (LB) as sintering aids for low-temperature sintering. All samples were successfully synthesized using conventional solid-state reaction method and sintered at 950, 1,000, 1,050, 1,100 and 1,175℃ for 2 hours. Without LB, specimens required sintering temperatures over 1,175℃ for sufficient densification, while the addition of 0.10-mol LB decreased the sintering temperatures down to 950℃. The average grain size and dielectric properties of BNT-24ST-10LB ceramics were enhanced with increasing sintering temperature. We found that the low-temperature sintered BNT-24ST piezoceramics by adding LB showed the d33*value of 402 pm/V at 4 kV/mm after sintering at 1,050℃, which was better than that of high-temperature fired specimens sintered at 1,175℃ without LB (242 pm/V). We believe that the results of this study promise a candidate for low-cost multilayer ceramic actuator applications.

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5RF 마그네트론 스퍼터링 시스템을 이용하여 증착한 AGZO 박막의 Ar 유량에 따른 구조적, 전기적, 광학적 특성

저자 : 장석현 ( Seok-hyeon Jang ) , 김덕규 ( Deok Kyu Kim )

발행기관 : 한국전기전자재료학회 간행물 : 전기전자재료학회논문지(J. Korean Inst. Electr. Electron. Mater. Eng.) 35권 1호 발행 연도 : 2022 페이지 : pp. 32-36 (5 pages)

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AGZO thin films were deposited on glass substrates using RF magnetron sputtering system under Ar flow rates, and their structural, electrical, and optical properties were analyzed systematically. As a result of the XRD pattern, the peak of the (002) (2θ≈33.7˚) orientation was observed, and it was found to have a hexagonal wurtzite structure. The sheet resistance of Ar 5 sccm was 3.073×102 Ω/sq and showed the best electrical properties because of the improvement of mobility due to the increase of the grain size and the variation of RMS roughness. In addition, the average transmittance was more than 90% for all samples, which demonstrated good optical properties. It is expected that the TCO characteristics can be improved by controlling Ar flow rates, and this will increase the efficiency of photoelectronic devices such as OLED and solar cells.

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6금속층 두께에 따른 ITO/Ag/ITO 다층 투명 전극의 발열 특성 연구

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발행기관 : 한국전기전자재료학회 간행물 : 전기전자재료학회논문지(J. Korean Inst. Electr. Electron. Mater. Eng.) 35권 1호 발행 연도 : 2022 페이지 : pp. 37-43 (7 pages)

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In this study, we investigated the optical, electrical and exothermic characteristics of ITO/Ag/ITO multilayer structures prepared with various Ag thicknesses on quartz and PI substrates. The transparent conducting properties of the ITO/Ag/ITO multilayer films depended on the thickness of the mid-layer metal film. The ITO/Ag (14 nm)/ITO showed the highest Haccke's figure of merit (FOM) of approximately 19.3×10-3 Ω-1. In addition, the exothermic property depended on the substrate. For an applied voltage of 3.7 V, the ITO/Ag (14 nm)/ITO multilayers on quartz and PI substrates were heated up to 110℃ and 200℃, respectively. The bending tests demonstrated a comparable flexibility of the ITO/Ag/IT multilayer to other transparent electrodes, indicating the potential of ITO/Ag/ITO multilayer as a flexible transparent conducting heater.

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7다중준위 상변환 메모리를 위한 Ge2Sb2Te5/Ti/W-Ge8Sb2Te11 구조의 전기적 특성 연구

저자 : 오우영 ( Woo-young Oh ) , 이현용 ( Hyun-yong Lee )

발행기관 : 한국전기전자재료학회 간행물 : 전기전자재료학회논문지(J. Korean Inst. Electr. Electron. Mater. Eng.) 35권 1호 발행 연도 : 2022 페이지 : pp. 44-49 (6 pages)

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In this paper, we investigated current (I)- and voltage (V)-sweeping properties in a double-stack structure, Ge2Sb2Te5/Ti/W-doped Ge8Sb2Te11, a candidate medium for applications to multilevel phase-change memory. 200-nm-thick Ge2Sb2Te5 and W-doped Ge8Sb2Te11 films were deposited on p-type Si(100) substrate using magnetron sputtering system, and the sheet resistance was measured using 4 point-probe method. The sheet resistance of amorphous-phase W-doped Ge8Sb2Te11 film was about 1 order larger than that of Ge2Sb2Te5 film. The I- and V-sweeping properties were measured using sourcemeter, pulse generator, and digital multimeter. The speed of amorphous-to-multilevel crystallization was evaluated from a graph of resistance vs. pulse duration (t) at a fixed applied voltage (12 V). All the double-stack cells exhibited a two-step phase change process with the multilevel memory states of high-middle-low resistance (HR-MR-LR). In particular, the stable MR state is required to guarantee the reliability of the multilevel phase-change memory. For the Ge2Sb2Te5 (150 nm)/Ti (20 nm)/WGe8Sb2Te11 (50 nm), the phase transformations of HR→MR and MR→LR were observed at t<30ns and t<65ns, respectively. We believe that a high speed and stable multilevel phase-change memory can be optimized by the double-stack structure of proper Ge-Sb-Te films separated by a barrier metal (Ti).

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8Nanosheet FETs에서의 효과적인 전열어닐링 수행을 위한 기계적 안정성에 대한 연구

저자 : 왕동현 ( Dong-hyun Wang ) , 박준영 ( Jun-young Park )

발행기관 : 한국전기전자재료학회 간행물 : 전기전자재료학회논문지(J. Korean Inst. Electr. Electron. Mater. Eng.) 35권 1호 발행 연도 : 2022 페이지 : pp. 50-57 (8 pages)

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Reliability of CMOS has been severed under aggressive device scaling. Conventional technologies such as lightly doped drain (LDD) and forming gas annealing (FGA) have been applied for better device reliability, but further advances are modest. Alternatively, electro-thermal annealing (ETA) which utilizes Joule heat produced by electrodes in a MOSFET, has been newly introduced for gate dielectric curing. However, concerns about mechanical stability during the electro-thermal annealing, have not been discussed, yet. In this context, this paper demonstrates the mechanical stability of nanosheet FET during the electro-thermal annealing. The effect of mechanical stresses during the electro-thermal annealing was investigated with respect to device design parameters.

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저자 : 김진아 ( Jin-ah Kim ) , 최세훈 ( Se-hoon Choi ) , 박홍규 ( Hong-gyu Park )

발행기관 : 한국전기전자재료학회 간행물 : 전기전자재료학회논문지(J. Korean Inst. Electr. Electron. Mater. Eng.) 35권 1호 발행 연도 : 2022 페이지 : pp. 58-65 (8 pages)

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The field of liquid crystal display (LCD) is constantly in the spotlight and the process of depositing an alignment layer in the LCD manufacturing process is very important to obtain excellent performance such as low-power driving and high-speed response to improve LCD performance. Therefore, research on liquid crystal (LC) alignment is being actively conducted. When manufacturing LCD, it is necessary to consider the effect of the alignment layer thickness as one of the factors affecting various LCD performances. In addition, previous studies confirmed the LC alignment characteristics correlate with the rotation speed in the spin coating process. Therefore, the electro-optical properties of the LCD were investigated by manufacturing a polyimide alignment layer by varying the rotation speed in the spin coating process in this study. It was confirmed that the thickness of the polyimide alignment layer was controlled according to the spin coating conditions. The average transmittances of anti-parallel LC cells at the spin coating speed of 2,500 rpm and 3,000 rpm are about 60%, which indicates that the LC cell has relatively higher performance. At the spin coating speed of 3,000 rpm, the voltage-transmittance curve of twisted nematic (TN) LC cell was below 1.5 V, which means that the TN LC cell operated at a low power. In addition, high-speed operating characteristics were confirmed with a response time of less than 30 ms. From these derived data, we confirmed that the ideal spin coating speed is 3,000 rpm. And these results provide an optimized polyimide alignment layer process when considering enhanced future LCD manufacturing.

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발행기관 : 한국전기전자재료학회 간행물 : 전기전자재료학회논문지(J. Korean Inst. Electr. Electron. Mater. Eng.) 35권 1호 발행 연도 : 2022 페이지 : pp. 66-71 (6 pages)

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The insulator used for the transmission line is a device that is bonded with a cap, pin, ceramic, and cement to withstand insulation capacity and mechanical load. The insulator design can help to reduce the dispersion of the electric field; thus, the optimization of today's design, especially as demanded power grows, is critical. The designs of four manufacturers were used to perform a comparative analysis. Under dry circumstances of the new product, an electric field distribution study was done with no pollutants attached. Manufacturer D's design has the best voltage uniformity of 24.33% and the arc length of 500 mm or more. Manufacturer C's design has an equalizing voltage of more than 2% higher than that of other manufacturers. The importance of the design of the insulator and the number of connections according to the installation conditions is very efficient for transmission lines that will increase in the future.

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발행기관 : 한국전기전자재료학회 간행물 : 전기전자재료학회논문지(J. Korean Inst. Electr. Electron. Mater. Eng.) 34권 5호 발행 연도 : 2021 페이지 : pp. 283-295 (13 pages)

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For the last decades, a research hotspot for the halide perovskites (HPs) is now showing great progress in terms of improving efficiency for numerous photovoltaic devices (PVDs). However, it still faces challenges in the case of long-term stability in the air atmosphere. Defect-free high-quality HP single crystals show their promising properties for the remarkable development of highly efficient and stable PVDs. Here, we summarize the growth processing routes for the stable HP single crystals as well as briefly discuss the pros and cons of those well-established synthesis routes. Furthermore, we briefly include the comparison note between the HP single crystals and polycrystalline perovskite films regarding their device applications. Based on the future progress, the review concludes subjective perspectives and current challenges for the development of HPs high-quality PVDs.

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4FinFET 및 GAAFET의 게이트 접촉면적에 의한 열저항 특성과 Fin-Layout 구조 최적화

저자 : 조재웅 ( Jaewoong Cho ) , 김태용 ( Taeyong Kim ) , 최지원 ( Jiwon Choi ) , 최자양 ( Ziyang Cui ) , 신동욱 ( Dongxu Xin ) , 이준신 ( Junsin Yi )

발행기관 : 한국전기전자재료학회 간행물 : 전기전자재료학회논문지(J. Korean Inst. Electr. Electron. Mater. Eng.) 34권 5호 발행 연도 : 2021 페이지 : pp. 296-300 (5 pages)

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The performance of devices has been improved with fine processes from planar to three-dimensional transistors (e.g., FinFET, NWFET, and MBCFET). There are some problems such as a short channel effect or a self-heating effect occur due to the reduction of the gate-channel length by miniaturization. To solve these problems, we compare and analyze the electrical and thermal characteristics of FinFET and GAAFET devices that are currently used and expected to be further developed in the future. In addition, the optimal structure according to the Fin shape was investigated. GAAFET is a suitable device for use in a smaller scale process than the currently used, because it shows superior electrical and thermal resistance characteristics compared to FinFET. Since there are pros and cons in process difficulty and device characteristics depending on the channel formation structure of GAAFET, we expect a mass-production of fine processes over 5 nm through structural optimization is feasible.

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5압전재료의 기초 물성 측정

저자 : 강우석 ( Woo-seok Kang ) , 이건주 ( Geon-ju Lee ) , 조욱 ( Wook Jo )

발행기관 : 한국전기전자재료학회 간행물 : 전기전자재료학회논문지(J. Korean Inst. Electr. Electron. Mater. Eng.) 34권 5호 발행 연도 : 2021 페이지 : pp. 301-313 (13 pages)

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본 논문은 대학 연구실과 산업현장에서 강유전 압전 분야 연구를 갓 시작한 이들이 압전 소재의 특성에 대한 기초적, 이론적 개념에 대해서는 각종 교과서와 논문을 통해 쉽게 접할 수 있는 반면, 그 특성들이 실제로 어떻게 측정되고 평가되는 지에 대한 정보를 얻기가 힘들다는 점에 착안하여 압전 분야 입문자가 관련 측정 기술을 보다 쉽게 이해하고 접근할 수 있도록 돕는 것을 목적으로 한다. 기초 유전 물성인 임피던스에 기반한 유전상수와 유전손실 측정법을 시작으로 압전상수, 전기기계결합계수, 품질계수 및 측정 방법에 대해 논의하고, 강유전성을 대표하는 전계에 따른 분극 변화 측정법에 대해 기술하였다. 본 논문에서는 이미 표준화되어 있는 측정법들을 소개하고 있지만, 이를 숙지하고 응용한다면 보다 도전적이고 창의적인 측정법을 도출할 수 있을 것으로 기대한다.

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6에어로졸 증착한 세라믹/금속 복합막의 금속 함량에 따른 습도 감지 특성 연구

저자 : 김익수 ( Ik-soo Kim ) , 구상모 ( Sang-mo Koo ) , 박철환 ( Chulhwan Park ) , 신원호 ( Weon Ho Shin ) , 이동원 ( Dong-won Lee ) , 오종민 ( Jong-min Oh )

발행기관 : 한국전기전자재료학회 간행물 : 전기전자재료학회논문지(J. Korean Inst. Electr. Electron. Mater. Eng.) 34권 5호 발행 연도 : 2021 페이지 : pp. 314-320 (7 pages)

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Controlling ambient humid condition through high performance humidity sensors has become important for various fields, including industrial process, food storage, and the preservation of historic remains. Although aerosol deposited humidity sensors using ceramic BaTiO3 (BT) material have been widely studied because of their longtime stability, there remain critical disadvantages, such as low sensitivity, low linearity, and slow response/recovery time in case of the sensors fabricated at room temperature. To achieve superior humidity sensing properties even at room temperature condition, BT-Cu composite films utilizing aerosol deposition (AD) process have been proposed based on the percolation theory. The BT-Cu composite films showed gradually improved sensing properties until the Cu concentration reached 15 wt% in the composite film. However, the excessive Cu (above 30 wt%) containing BT-Cu composite films showed a rapid decrease of the sensing properties. The results of observed surface morphology of the AD fabricated composite films, to figure out the metal filler effect, showed correlation between surface topography as well as size and the amount of open pores according to the metal filler content. Overall, it is very important not only dielectric constant of the humidity sensing films but also microstructures, because they affect either the variation range of capacitance by ambient humidity or adsorption/desorption of ambient humidity onto/from the humidity sensing films.

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7브러쉬 코팅 공정을 이용한 용액 기반 BiAlO 박막의 제작과 액정 소자에의 응용

저자 : 이주환 ( Ju Hwan Lee ) , 김대현 ( Dai-hyun Kim )

발행기관 : 한국전기전자재료학회 간행물 : 전기전자재료학회논문지(J. Korean Inst. Electr. Electron. Mater. Eng.) 34권 5호 발행 연도 : 2021 페이지 : pp. 321-326 (6 pages)

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We fabricated BiAlO thin film by a solution process with a brush coating to be used as liquid crystal (LC) alignment layer. Solution-processed BiAlO was coated on the glass substrate by brush process. Prepared thin films were annealed at different temperatures of 80℃, 180℃, and 280℃. To verify whether the BiAlO film was formed properly, X-ray photoelectron spectroscopy analysis was performed on Bi and Al. Using a crystal rotation method by polarized optical microscopy, LC alignment state was evaluated. At the annealing temperature of 280℃, the uniform homogenous LC alignment was achieved. To reveal the mechanism of LC alignment by brush coating, field emission scanning electron microscope was used. Through this analysis, spin-coated and brush coated film surface were compared. It was revealed that physical anisotropy was induced by brush coating at a high annealing temperature. Particles were aligned in one direction along which brush coating was made, resulting in a physical anisotropy that affects a uniform LC alignment. Therefore, it was confirmed that brush coating combined with BiAlO thin film annealed at high temperature has a significant potential for LC alignment.

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8리튬이온 배터리의 분리막 손상 요인별 방전펄스의 검출과 분석

저자 : 임승현 ( Seung-hyun Lim ) , 이경렬 ( Gyeong-yeol Lee ) , 김남훈 ( Nam-hoon Kim ) , 김동언 ( Dong-eon Kim ) , 길경석 ( Gyung-suk Kil )

발행기관 : 한국전기전자재료학회 간행물 : 전기전자재료학회논문지(J. Korean Inst. Electr. Electron. Mater. Eng.) 34권 5호 발행 연도 : 2021 페이지 : pp. 327-332 (6 pages)

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Lithium-ion batteries (LIBs) have become a main energy storage device in various applications, such as portable appliances, renewable energy facilities, and electric vehicles. However, the poor thermal stability of LIBs may cause explosion or fire. The thermal runaway is the result of a failure of the separator inside LIB. Damages like tearing, piercing, and collapsing of the separator were simulated in a mechanical, an electrical, and a thermal way, and small discharge pulses of a few mV were detected at the time of separator damages. From the experimental results, this paper provided a method that can identify the separator failure before thermal runaway in the aspect of a potential explosion and fire prevention measures.

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9벌크형 고온 초전도 합성

저자 : 이상헌 ( Sang Heon Lee )

발행기관 : 한국전기전자재료학회 간행물 : 전기전자재료학회논문지(J. Korean Inst. Electr. Electron. Mater. Eng.) 34권 5호 발행 연도 : 2021 페이지 : pp. 333-336 (4 pages)

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Oxide YBCO bulk superconductors are manufactured using the melt process. Because seed crystal growth method utilizes a slow-spreading layer-by-layer reaction, a long-term heat treatment is required to manufacture a single-crystal specimen of several cm. In this study, the melt process method was applied to compensate for the shortcomings of the seed crystal growth method. The thickness of the upper and lower pellets of the YBCO bulk was molded to 40 mm, and YBCO superconductor was produced by heat treatment. The measurement results of capture magnetism was in line with the literature. This results in a relationship that the higher the growth of Y211 particle in the YBCO, the higher the superconducting properties. We analyzed the YBCO superconductor, focusing on the Y2BaCuO5 particle distribution.

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10Phase Evolution, Thermal Expansion, and Microwave Dielectric Properties of Cordierite-Al2O3 Composite

저자 : Shin Kim , Eun-doe Song , Hae-jin Hwang , Joo-sung Lee , Sang-ok Yoon

발행기관 : 한국전기전자재료학회 간행물 : 전기전자재료학회논문지(J. Korean Inst. Electr. Electron. Mater. Eng.) 34권 5호 발행 연도 : 2021 페이지 : pp. 337-341 (5 pages)

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Phase evolution, thermal and microwave dielectric properties of cordierite-Al2O3 composite were investigated. As the content of Al2O3 increased, mullite, sapphirine, and spinel were formed as secondary phases, implying that cordierite may be decomposed by the reaction with Al2O3. All sintered specimens exhibited dense microstructures. The densification occurred through liquid phase sintering. As the content of Al2O3 increased, the thermal expansion coefficient and the dielectric constant increased, whereas the quality factor decreased. The thermal expansion coefficient, the dielectric constant, and the quality factor of the 90 wt% cordierite 10 wt% Al2O3 composite sintered at 1,425℃ were 2.9×10-6 K-1, 5.1, and 34,844 GHz, respectively.

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