Thermal properties of silica fume-SiO2 based porous ceramic fabricated by using foaming method (직접 발포법을 이용해 제조된 실리카 흄-SiO2계 다공성 세라믹의 열적 특성)

Taewan Ha (하태완); KANG SEUNG GU (강승구); Kangduk Kim (김강덕)

doi:10.6111/JKCGCT.2021.31.4.182

Thermal properties of silica fume-SiO2 based porous ceramic fabricated by using foaming method

Journal of the Korean Crystal Growth and Crystal Technology
Abbr : J. Korean Cryst. Growth Cryst. Technol.
2021, 31(4), pp.182-189
DOI : 10.6111/JKCGCT.2021.31.4.182
Publisher : The Korea Association Of Crystal Growth, Inc.
Research Area : Engineering > Materials Science and Engineering
Received : June 15, 2021
Accepted : July 20, 2021
Published : August 31, 2021

Taewan Ha ¹, KANG SEUNG GU ¹, Kangduk Kim ¹

¹경기대학교

Accredited

ABSTRACT

Porous ceramics were manufactured using the foaming method for the development of inorganic insulating materials. Silica fume and SiO2 were used as main raw materials, and bentonite was used as a rapid setting agent for uniform structure formation of porous ceramics. The porous ceramics were sintered at 1200°C, and porosity, density, compressive strength, microstructure and thermal conductivity were analyzed. As the content of silica fume to SiO2 of the porous ceramics increased 70 to 90 %, the specific gravity increased from 0.63 to 0.69, and the compressive strength increased from 9.41 Mpa to 12.86 Mpa. But, the porosity showed a tendency to decrease from 72.07 % to 70.82 %, contrary to the specific gravity. As a result of measuring the thermal conductivity, the porous ceramic with a silica fume content of 70 % showed a thermal conductivity o f 0.75 to 0 .72W/m∙K at 25 t o 800°C, respectively, and, another that a silica fume content of 90 % showed a 0.66~0.86W/m∙K. So the l ower t he s ilica f ume content, t he l ower t he t hermal c onductivity, which w as c onfirmed to b econsistent with porosity result. As a result of microstructure analysis using SEM (Scanning Electron Microscope), pores in the range of tens to hundreds µm were observed inside and outside the porous ceramic, and it was confirmed that the pore distribution was relatively uniform.

KEYWORDS

Porous ceramic, Compressive strength, Porosity, Thermal conductivity, Direct forming methods

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Journal of the Korean Crystal Growth and Crystal Technology 2023 KCI Impact Factor : 0.19

Thermal properties of silica fume-SiO2 based porous ceramic fabricated by using foaming method

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* References for papers published after 2023 are currently being built.

Journal of the Korean Crystal Growth and Crystal Technology 2023 KCI Impact Factor : 0.19

Thermal properties of silica fume-SiO2 based porous ceramic fabricated by using foaming method

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KEYWORDS

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