• Title, Summary, Keyword: Ceramic

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Development of Ceramic Body using Waste Celadon (청자 파도자기를 활용한 도자기 소지 개발)

  • Lee, Jea-Il;Park, Joo-Seok;Lee, Yong-Seok;Lee, Byung-Ha
    • Journal of the Korean Ceramic Society
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    • v.46 no.6
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    • pp.602-608
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    • 2009
  • The yield is increasing as the manufacturing technology of ceramics progresses, however, there are many ceramics of poor quality due to variables upon producing ceramics. Some of those waste ceramics are recycled by sanitary ware or tile manufacturers, but most of them are filled in making environmental problem. Therefore, a research begins to recycle waste ceramic ware as alternative to some imported ceramic ware materials and to reduce environmental pollution. This study, succeeding last study which applied waste white ware as ceramic body material, aimed to solve problems of environment and materials by recycling waste ceradon generated in specially formed areas for ceramic in Gyeonggi-do such as Icheon, Yeoju and Gwangju as the ceramic body material. Consequently, the addition of waste ceramic ware into the ceramic body was judged to have limit up to 30% according to plasticity measurement. As we added shredded waste ceramic ware as much as 30% into basic ceramic body and checked its features, the pore rate and absorption rate were good to be average 4% and 3% respectively. In addition, it showed strength more than 720 kgf/$cm^2$ which is higher than existing ceradon body on the market with good sinter state; so it is judged to be available or developed as new ceramic body.

Micronization of Ceramic Pigments for Digital Ink-Jet Printing Process (디지털 프린팅 공정을 위한 세라믹 안료의 미립화 거동 분석)

  • Lee, Ji-Hyeon;Hwang, Hae-Jin;Kwon, Jong-Woo;Kim, Jin-Ho;Hwang, Kwang-Taek;Han, Kyu-Sung
    • Korean Journal of Materials Research
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    • v.27 no.2
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    • pp.82-88
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    • 2017
  • Ink-jet printing techniques with ceramic ink, which contains ceramic pigments as colorant, are in increasingly use in the ceramic industry. Generally, ceramic pigments that are produced by conventional method show diameters of several micrometers; these micrometer sized particles in the ink-jet printing process can cause undesirable behavior such as print head nozzle clogging. To prevent this problem, a particle size reduction process is required. In this study, CMYK (cyan, magenta, yellow, black) pigments were synthesized via solid state method. Each pigment particle was milled to submicron size by an attrition mill. The effects of micronizing on the morphology, mechanical property, crystal structure and color property of the CMYK ceramic pigments were investigated by field emission scanning electron microscopy (FE-SEM), particle size analysis (PSA), X-ray diffraction (XRD) and CIE $L^{\ast}a^{\ast}b^{\ast}$.

Ink-Jet 3D Printability of Ceramic Ink with Contact Angle Control

  • Park, Jae-Hyeon;Lee, Ji-Hyeon;Kim, Deug Joong;Hwang, Kwang-Taek;Kim, Jin-Ho;Han, Kyu-Sung
    • Journal of the Korean Ceramic Society
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    • v.56 no.5
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    • pp.461-467
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    • 2019
  • Ink-jet printing technology, which utilizes a digitalized design to print fine ink directly on a substrate, has been of interest in various industries due to its high efficiency and adaptability to various materials. Recently, active attempts have been made to apply ceramic materials having excellent heat resistance, light resistance, and chemical resistance to the ink-jet printing process. In this study, ceramic ink was synthesized by combining ceramic pigments with UV curable polymer. 3D printability at various contact angles between ceramic ink and substrate was analyzed in detail. Rheological properties of the synthesized ceramic ink were optimized to meet the requirements of the ink-jet printing process, and the contact angle of UV curable ceramic ink was controlled through surface treatment of the substrate. The potential for additive manufacturing of ceramic material using ink-jet printing was investigated by analyzing the effect of contact angle control on ceramic ink droplets and their 3D printability.

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
    • Journal of the Korean Ceramic Society
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    • v.54 no.6
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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.

Ceramic Stereolithography: Additive Manufacturing for 3D Complex Ceramic Structures

  • Bae, Chang-Jun;Ramachandran, Arathi;Chung, Kyeongwoon;Park, Sujin
    • Journal of the Korean Ceramic Society
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    • v.54 no.6
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    • pp.470-477
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    • 2017
  • Ceramic processing to fabricate 3D complex ceramic structures is crucial for structural, energy, environmental, and biomedical applications. A unique process is ceramic stereolithography, which builds ceramic green objects from CAD files from many thin liquid layers of powder in monomer, which are solidified by polymerization with a UV laser, thereby "writing" the design for each slice. This approach directly writes layers in liquid ceramic suspension and allows one to fabricate ceramic parts and products having more accurate, complex geometries and smooth surfaces. In this paper, both UV curable materials and processes are presented. We focus on the basic material principles associated with free radical polymerization and rheological behavior, cure depth and broadening of cured lines, scattering at ceramic interface and their corresponding simulation. The immediate potentials for ceramic AM to change industry fabrication are also highlighted.

Synthesis and Printability of Aqueous Ceramic Ink with Graft Polymer (Graft Polymer를 이용한 수계 세라믹 잉크의 합성 및 프린팅 특성평가)

  • Lee, Ji-Hyeon;Hwang, Hae-Jin;Kim, Jin-Ho;Hwang, Kwang-Taek;Han, Kyu-Sung
    • Korean Journal of Materials Research
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    • v.29 no.10
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    • pp.639-646
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    • 2019
  • Ink-jet printing is a manufacturing process technology that directly prints a digitalized design pattern onto a substrate using a fine ink jetting system. In this study, environmentally friendly yellow aqueous ceramic ink is synthesized by mixture of distilled water, yellow ceramic pigment and additives for ink-jet printing. The graft polymer, which combines electrostatic repulsion and steric hindrance mechanism, is used as a surfactant for dispersion stability of aqueous ceramic ink. Synthesized ceramic ink with graft polymer surfactant shows better dispersion stability than did ceramic ink with PAA surfactant; synthesized ink also shows desirable ink-jet printability with the formation of a single ink droplet during printability test. Finally, ceramic ink printed on glass substrate and ceramic ink with graft polymer surfactant shows a high contact angle without surface treatment on glass substrate. Consequently, it is confirmed that the ceramic ink with graft polymer surfactant can achieve high printing resolution without additional surface treatment process.

Synthesis and Characterization of ZrO2 Ceramic Ink for Dispenser Printing (디스펜서 프린팅을 위한 ZrO2 세라믹 잉크의 합성 및 특성 평가)

  • Lee, Ji-Hyeon;Hwang, Hae-Jin;Kim, Jin-Ho;Hwang, Kwang-Taek;Han, Kyu-Sung
    • Korean Journal of Materials Research
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    • v.28 no.2
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    • pp.95-100
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    • 2018
  • In this study, $ZrO_2$ ceramic ink was formulated for additive manufacturing three dimensional structure using dispenser printing technique. Ceramic ink with various $ZrO_2$ loading (30, 40, 50vol%) was prepared to evaluate their rheological properties and printability. High $ZrO_2$ loading $ZrO_2$ ceramic ink showed higher elastic modulus and improved shape retention, when the ceramic ink was printed and sintered at $1450^{\circ}C$ for 1h. Microstructural analysis of printed $ZrO_2$ objective indicated that high $ZrO_2$ loading objective showed lower porosity and smaller pore size.

Formulation and Evaluation of Glass-Ceramic Ink for Digital Ink-jet Printing (디지털 프린팅용 글래스-세라믹 복합 잉크 제조 및 특성 평가)

  • Kwon, Jong-Woo;Lee, Jong-Heun;Hwang, Kwang-Taek;Kim, Jin-Ho;Han, Kyu-Sung
    • Korean Journal of Materials Research
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    • v.27 no.11
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    • pp.583-589
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    • 2017
  • Ceramic ink-jet printing has become a widespread technology in ceramic tile and ceramicware industries, due to its capability of manufacturing products on demand with various designs. Generally, thermally stable ceramic inks of digital primary colors(cyan, magenta, yellow, black) are required for ink-jet printing of full color image on ceramic tile. Here, we synthesized an aqueous glass-ceramic ink, which is free of Volatile organic compound(VOC) evolution, and investigated its inkjet printability. $CoAl_2O_4$ inorganic pigment and glass frit were dispersed in aqueous solution, and rheological behavior was optimized. The formulated glass-ceramic ink was suitably jetted as single sphere-shaped droplets without satellite drops. After ink-jet printing and firing processes, the printed glass-ceramic ink pattern on glazed ceramic tile was stably maintained without ink spreading phenomena and showed an improved scratch resistance.