• 제목/요약/키워드: Ceramic material

검색결과 3,060건 처리시간 0.034초

Preparation of Si(Al)ON Precursor Using Organoaluminum Imine and Poly (Phenyl Carbosilane), and the Compositional Change of the Film with Different Heat Treatment Condition

  • Lee, Yoonjoo;Shin, Dong-Geun;Kwon, Woo Teck;Kim, Soo Ryong;Kim, Younghee
    • 한국세라믹학회지
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    • 제52권4호
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    • pp.243-247
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    • 2015
  • Si(Al)ON precursor was synthesized by formation of new Si-N bond using organoaluminum imine and liquid type poly(phenyl carbosilane). It was decomposed between $200-600^{\circ}C$, and the ceramic yield was 51% after pyrolysis. 150 - 200 nm in thickness of coating film was obtained by spin coating method. The precursor was easily oxidized during process because it was unstable in air. However the oxygen content was limited to 0.5 - 0.7 to silicon in heat treatment step. Even though the content of nitrogen was decreased by pyrolysis, Al-N and Si-N bonds were formed in ammonia atmosphere, and Si(Al)ON film was formed with 0.2 in content to silicon.

습도조절용 세라믹패널 및 도료의 흡·방습성능 평가 (Performance Evaluation of Water Vapour Adsorption & Desorption Properties of Ceramic Panel and Painting Materials for Humidity Control)

  • 장건영;류동우
    • 대한건축학회논문집:구조계
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    • 제34권3호
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    • pp.43-52
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    • 2018
  • This study is conducted to evaluate the performance of ceramic panels and painting materials for humidity control which are developed in non-plastic room temperature hardening structure as part of a project to improve a residential environment for the low-income class, rather than the performance of high-priced humidity control materials that are produced with the existing plasticity processing. The testing methods included the measurements of absorption & desoprtion of humidity per material; Mock-up Testing; an evaluation method of comparing the absorption & desoprtion performances of Ecocarat, ceramic panels and painting materials through Living Lab. According to the measurements of absorption & desoprtion per material, ceramic panels, E panel, and ceramic painting material showed 73.3g/m2, 96.6g/m2, and 111.1g/m2, respectively. That is, the performance of humidity control of each material was found to be good in the order of: Ceramic Paint > E panel > Ceramic Panel. According to performance evaluation testing with Mock-up test and Living Lab, Ceramic Paint, Ecocarat, and Ceramic Panels showed better absorption & desoprtion performances in the order.

바이몰프형 압전세라믹 캔틸레버를 이용한 수력에너지 하베스터 모듈 제작 및 발전 특성 (Fabrication and Energy Harvesting Characteristics of Water Energy Harvester Using Piezoelectric Ceramic Bimorph Cantilever)

  • 김경범;김창일;윤지선;정영훈;남중희;조정호;백종후;남산;성태현
    • 한국전기전자재료학회논문지
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    • 제25권12호
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    • pp.943-948
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    • 2012
  • A new water energy harvester module, which is composed of piezoelectric bimorph cantilevers, harvesting circuit and a shaft with 16 impellers at a center axis, was fabricated for energy harvesting application. High energy density $Pb(Zr_{0.54}Ti_{0.46})O_3$ + 0.2 wt% $Cr_2O_3$ + 1.0 wt% $Nb_2O_5$ (PZT-CN) thick film obtained by tape casting method was used for the bimorph cantilever. The PZT-CN bimorph cantilever with a proof mass of 49 g exhibited extremely high output power of 22.5 mW (24 $mW//cm^3$) at resonance frequency of 11 Hz. In addition, the fabricated water energy harvester has a cylindrical structure with 48 bimorph cantilevers clamped at inner surface. A significantly high output power of 433 mW was obtained at a rotation speed of 120 rpm with a resistive load of $500{\Omega}$ for the water energy harvester.

Optimization of Aqueous Nano Ceramic Ink and Printing Characterization for Digital Ink-Jet Printing

  • Kwon, Jong-Woo;Sim, Hee-Seok;Lee, Jong-Heun;Hwang, Kwang-Taek;Han, Kyu-Sung;Kim, Jin-Ho;Kim, Ung-Soo
    • 한국세라믹학회지
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    • 제54권6호
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    • pp.478-483
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    • 2017
  • The advantage of ceramic ink-jet printing technology is the accurate and fast printing process of digital images for various products. For digital ink-jet printing applications, ceramic ink requires proper viscosity and surface tension, along with dispersion stability of the inorganic pigments. The purpose of this study is the formulation of an environment-friendly ceramic ink with a water-based system; using nano-sized $CoAl_2O_4$ pigment as a raw material, ink should have dispersion stability to prevent nozzle clogging during ink-jet printing process. In addition, the surface tension of the ceramic ink was optimized with the polysiloxane surfactant according to the surface tension requirement (20 - 45 mN/m) for ceramic ink-jet printing; by adjusting the viscosity with poly ethylene oxide, jetting behavior of the ceramic ink was investigated according to changes in the physical features through drop watcher measurement.

광경화 3D 프린팅 공정을 위한 실리카 복합소재 합성 및 특성 분석 (Synthesis and Characterization of Silica Composite for Digital Light Processing)

  • 이진욱;남산;황광택;김진호;김응수;한규성
    • 한국재료학회지
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    • 제29권1호
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    • pp.23-29
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    • 2019
  • Three-dimensional(3D) printing is a process for producing complex-shaped 3D objects by repeatedly stacking thin layers according to digital information designed in 3D structures. 3D printing can be classified based on the method and material of additive manufacturing process. Among the various 3D printing methods, digital light processing is an additive manufacturing technique which can fabricate complex 3D structures with high accuracy. Recently, there have been many efforts to use ceramic material for an additive manufacturing process. Generally, ceramic material shows low processability due to its high hardness and strength. The introduction of additive manufacturing techniques into the fabrication of ceramics will improve the low processability and enable the fabrication of complex shapes and parts. In this study, we synthesize silica composite material that can be applied to digital light processing. The rheological and photopolymeric properties of the synthesized silica composite are investigated in detail. 3D objects are also successfully produced using the silica composite and digital light processing.

다공 세라믹 연소기 속에서의 예혼합연소에 대한 민감도 해석의 적용 (Application of sensitivity analyses in premixed combustion within a porous ceramic burner)

  • 임인권
    • 대한기계학회논문집B
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    • 제22권2호
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    • pp.162-172
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    • 1998
  • A numerical study of premixed combustion within a porous ceramic burner (PCB) is performed to understand flame behavior with respect to various model parameters. Basic flame structure within the porous ceramic burner and species profiles such as NO and CO are examined. Sensitivity analysis of flame speed, gas and solid temperature, NO and CO emission from the burner with respect to reaction steps and various physical properties of the ceramic material is applied to find the most significant parameters in selection of porous materials for the porous ceramic burner. Effects of thermal conductivity, extinction coefficient and scattering albedo on the burner characteristics are studied through the sensitivity analysis. The results of sensitivity study reveal the order of importance in ceramic material properties to get suitable burner performance. Scattering albedo, which governs the ratio of absorbed energy by the ceramic material to total radiative energy transferred, is one of the most important parameters in the material properties since it affects the actual absorbed radiation rate and thus it largely affects the flame structure. Through the study, it is found that the sensitivity study can be used to estimate the flame behavior within the porous ceramic burner more effectively.

A Study on the Physical Properties of Mineral Hydrate Insulation Material Mixed with Basalt Fiber

  • Park, Jae-Wan;Chu, Yong-Sik;Seo, Sung-Kwan;Jeong, Jae-Hyen
    • 한국세라믹학회지
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    • 제53권1호
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    • pp.63-67
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    • 2016
  • Mineral hydrate is a new insulation material that compensates for the defects of existing materials. Mineral hydrate is made of inorganic ingredients; therefore, it is nonflammable. The porous structure of mineral hydrate makes the material lightweight and insulating. Mineral hydrate insulation and similar products have been studied and manufactured in Korea and abroad. However, these insulation materials need to improve in terms of strength. In this study, basalt fiber was used to enhance the strength. In order to observe the property changes, compressive strength, heat conductivity, and specific gravity were measured and XRD pattern analysis was performed. These tests confirmed that basalt fiber was effective at improving the strength and lowering the heat conductivity of mineral hydrate insulation.

Cavity Perturbation Method를 이용한 마이크로파 주파수대의 고온 유전특성 측정 연구 (Measurement of High Temperature Dielectric Property at Microwave Frequency Using Cavity Perturbation Method)

  • 김동은;정진호;이성민;김형태
    • 한국분말재료학회지
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    • 제13권6호
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    • pp.455-461
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    • 2006
  • High temperature dielectric constants of the various ceramic materials have been measured using cavity perturbation method. The measurements were applied to refractory, traditional and fine ceramic powder compacts from room temperature to $1200^{\circ}C$. Calibration constant in the equation suggested by Hutcheon et al., was determined from the dielectric constants of reference specimen (teflon and alumina) at room temperature. From these results, informations on the refectory materials were obtained for the microwave kiln design and understanding of the microwave heating effects of ceramics have been improved.