• Title/Summary/Keyword: Ceramic heating element

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Evaluation of the Influence of Pyrolysis Temperature on the Electrical Heating Properties of Si-O-C Fiber

  • Sanghun Kim;Seong-Gun Bae;Bum-Mo Koo;Dong-Geun Shin;Yeong-Geun Jeong
    • Composites Research
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    • v.37 no.4
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    • pp.330-336
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    • 2024
  • Silicon carbide (SiC) fibers exhibit excellent heat and chemical resistance at high temperatures. In this study, polycarbosilane melt spinning, oxidation curing, and pyrolysis were performed to fabricate amorphous SiC fibers, and their resistance heating characteristics were evaluated. A stick-type amorphous silicon carbide fiber heating element was manufactured, and the resistance was measured using the two-point probe method. The structural, electrical, and heating characteristics were evaluated at different pyrolysis temperatures. The fiber produced at 1300℃ displayed the highest conductivity and the maximum heating compared to the fibers produced at 1200℃ and 1400℃. This may be attributed to difference in the structures of the fibers, particularly the SiC and graphitic carbon structures.

Electrical Transport and Joule Heating of ZrB2 Network in SiC Matrix

  • Kim, Jung-Hun;Kim, Chang-Yeoul;Choi, Sung-Churl
    • Journal of the Korean Ceramic Society
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    • v.55 no.5
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    • pp.440-445
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    • 2018
  • To control the electrical properties of a SiC heating element, we sintered $SiC-ZrB_2$composites by using the spark plasma sintering method. The addition of $ZrB_2$ particles with lower electrical conductivity to the SiC matrices with comparatively higher electrical resistivity lowers the electrical resistivities of the composite material. The $ZrB_2$ particles aggregate to form large particles and 3-1, 3-2, and 3-3 networks, i.e., conduction paths. In our study, about $1-{\mu}m$-sized $ZrB_2$ powders start to form the conduction path at about 10 vol.% of addition, namely the threshold volume. The Joule heating experiment shows that 20 vol.% $ZrB_2$-added SiC heating element has outstanding heating efficiency.

Fabrication and resistance heating properties of flexible SiC fiber rope as heating elements (유연한 탄화규소 섬유 로프 발열체의 제조와 저항 발열 특성)

  • Joo, Young Jun;Cho, Kwang Youn
    • Journal of the Korean Crystal Growth and Crystal Technology
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    • v.30 no.6
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    • pp.258-263
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    • 2020
  • Silicon carbide (SiC) fibers mainly fabricated from polycarbosilane, a ceramic precursor, are applied as reinforcing materials for ceramic matrix composites (CMCs) because of their high temperature oxidation resistance, tensile strength, and light weight. In this study, continuous SiC fibers used to fabricate rope-type flexible heating elements capable of generating high-temperature heat (> 650℃). For high-efficiency heating elements, the resistance of SiC fiber rope was measured by 2-point probe method according to the cross-sectional area and length. In addition, the fabrication conditions of rope-type SiC fiber heating elements were optimized by controlling the oxygen impurities and the size of crystal grains present in the amorphous SiC fiber. As a result, the SiC fiber heating element having a resistance range of about 100~200 Ω exhibited an excellent power consumption efficiency of 1.5 times compared to that of the carbon fiber heating element.

Design and Verification of Ceramic Heating Element-based Tankless Instant Electric Water Heater (세라믹 발열체기반 비저장식 순간 전기 온수기 개발 및 검증)

  • Ahn, Sung-Su;Kim, Woo-Hyun
    • Journal of the Institute of Electronics and Information Engineers
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    • v.53 no.11
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    • pp.151-159
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    • 2016
  • This paper proposes a ceramic heating element-based tankless instant electric water heater for hand/face washing that does not require a lot of hot water. The heating module, which heats the input water and outputs hot water, operates the ceramic heating element detecting input water using a flow sensor. Inside of the heating module is designed to form one flow path in order to get almost $15^{\circ}C$ increased heated water compared to the input water temperature within 2 second after 1.5 liter per minute water supply. The design validity is verified using a heat flow analysis of the water flow and temperature variations inside of the heating module also. Based on the design data, the heating module is constructed including a single rod-type ceramic heating element. After that, a prototype system having temperature setting function by three steps were constructed. The prototype system is connected to a 1.5 liter per minute water supply line, and the water output temperature and time measurement experiments confirmed that the proposed system output the heated water increased by $18.3^{\circ}C$ in case of third step setting within 2 second after water supply. And standby power is under 1 W and peak power does not exceed the permissible range for the general house usage. Several performance results verify that the proposed tankless instant electric water heater is applicable for the washstand of the house, highway rest area and factory so on as winter-time hand/face washing.

The Effect of pain control and improve function of knee applied to osteoarthritis by carbon surface heating (퇴행성 관절염 환자에게 적용한 탄소면상발열체가 통증조절과 슬관절 기능 향상에 미치는 효과)

  • Son, Min-Young;Lee, Byung-Hoon;Oh, Kyeong-Ae;Park, Jong
    • Journal of Digital Convergence
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    • v.11 no.9
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    • pp.247-254
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    • 2013
  • This study was to investigate the effects of pain control and improvement function to far infrared ray of carbon surface heating element applied on elderly women with knee osteoarthritis. The subjects for this study were forty-five subjects with osteoarthritis, who were divided convenice sampling into 3 groups, control(15 female, no intervention), ceramic far infrared ray(15 female, applied ceramic far infrared rays) and carbon surface-heating(15 female, applied carbon surface-heating) after treatment measuring VAS, PPT and K-WOMAC. These results represent decreased pain and improved function by applied carbon surface heating element and ceramic far infrared ray on osteoarthritis knee. Therefore, carbon surface heating element will be a good treatment for osteoarthritis.

Optimization of Electrode Pattern for Multilayer Ceramic Heater by Finite Element Method (유한요소법에 의한 적층형 세라믹 히터의 전극 패턴 최적화)

  • Han, Yoonsoo;Kim, Shi Yeon;Yeo, Dong-Hun
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.30 no.12
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    • pp.776-781
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    • 2017
  • In this study, we investigated the effect of electrode pattern design on the thermal shock resistance and temperature uniformity of a ceramic heater. A cordierite substrate with a low thermal expansion coefficient was fabricated by tape casting, and a tungsten electrode was printed and used as a heating element. The temperature distribution of the ceramic heater was calculated by a finite-element method (FEM) by considering various electrode patterns, and the tensile stress distribution due to the thermal stress was calculated. In the electrode pattern with a single-line width, the central part of the ceramic heater was heated to the maximum temperature, and the position of the ceramic heater having a double-line width was changed to the maximum temperature, depending on the position of the minimum line width pattern. The highest tensile stress was found along the edges of the ceramic heater. The temperature gradient at the edge determined the tensile stress intensity. The smallest tensile stress was observed for electrode pattern D, which was expected to be advantageous in resisting thermal shock failures in ceramic heaters.

$MoSi_2$/SiC Ceramic Composites Prepared by Polymer Pyrolysis (고분자 열분해에 의한 $MoSi_2$/SiC 세라믹 복합체)

  • 김범섭;김득중;김동표
    • Journal of the Korean Ceramic Society
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    • v.37 no.8
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    • pp.805-810
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    • 2000
  • The formation, microstructure and properties of MoSi2/SiC ceramic composites by polymer pyrolysis were investigated for the application of heating element material. Polymethylsiloxanes were mixed with Si, SiC, MoSi2 as filler and ceramic composites prepared by pyrolysis in N2 atmosphere at 1320~145$0^{\circ}C$ were studied. Dimensional change, density variation and phases were analyzed and correlated to the resulting material properties. Microstructures of ceramic composite prepared by polymer pyrolysis were composed of MoSi2, SiC and silicon oxycarbide glass matrix. Depending on the pyrolysis conditions, ceramic composites with a density of 86~90 TD%, a fracture strength of 213~284 MPa, a thermal expansion coefficient of 4~7$\times$10-6 were obtained. The electrical resistivity of the specimen decreased with increasing of temperature up to 50$0^{\circ}C$.

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A Study on the Residual Stresses of Ceramic Coating (세라믹코팅재의 잔류응력에 대한 연구)

  • Han, Ji-Won
    • Journal of the Korean Society of Safety
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    • v.22 no.1 s.79
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    • pp.19-23
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    • 2007
  • The aim of this study was to determine residual stresses in thermal barrier coatings(TBCs) by isothermal heating. Specimens were heated at the range of $1000{\sim}1600^{\circ}C$. A finite element method was used to determine the residual stresses. Finite element coupled heat transfer and elastic-plastic thermal stress analysis using a general purpose commercial FEM software ABAQUS. I obtained the stresses were not affected below the temperature of $1400^{\circ}C$ but affected over that of temperature.

A Study on Heating Element Properties of Carbon Nanotube/Silicon Carbonitride Composite Sheet using Branched Structured Polysilazane as Precursor (가지 달린 구조의 폴리실라잔을 전구체로 이용해 제조한 카본 나노튜브/실리콘 카보나이트라이드 복합체 시트의 발열특성에 관한 연구)

  • Huh, Tae-Hwan;Song, Hyeon Jun;Jeong, Yeong Jin;Kwark, Young-Je
    • Composites Research
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    • v.33 no.6
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    • pp.395-400
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    • 2020
  • In this paper, we manufactured silsesquiaznae (SSQZ)-coated carbon nanotube (CNT) surface heating elements, which allowed stable heating at high temperatures. The prepared composite sheet was confirmed by FE-SEM that the SSQZ fully coated the surface of CNT sheet. Furthermore, it was also confirmed that the silicon carbonitride (SiCN) ceramic formed by heat treatment of 800℃ have no defects found and maintain intact structure. The CNT/SiCN composite sheet was able to achieve higher thermal stability than raw CNT sheets in both nitrogen and air atmosphere. Finally, the CNT/SiCN composite sheet was possible to heat up at a temperature of over 700℃ in the atmosphere, and the re-heating was successfully operated after cooling.