Study on the glass-ceramics containing coal bottom ashes fabricated by 2-stages heat treatment method (2단계 열처리법으로 제조된 석탄바닥재가 주성분인 결정화 유리에 관한 연구)

조시내; KANG SEUNG GU (강승구)

Study on the glass-ceramics containing coal bottom ashes fabricated by 2-stages heat treatment method

Journal of the Korean Crystal Growth and Crystal Technology
Abbr : J. Korean Cryst. Growth Cryst. Technol.
2010, 20(6), pp.272-277
Publisher : The Korea Association Of Crystal Growth, Inc.
Research Area : Engineering > Materials Science and Engineering

조시내 ¹, KANG SEUNG GU ¹

¹경기대학교

Accredited

ABSTRACT

The glass-ceramics containing bottom ash (B/A) which was a by-produced from an electrical power plant was fabricated and its crystalline phase, microstructure and mechanical properties were analyzed. At first, the glass was fabricated by adding modifier oxide Li2O to lower the melting temperature of coal bottom ash. The glass obtained was heat-treated by using a 2-stage process to crystallize, that is to say, to increase the degree of crystallization in the glassceramics,the first heat treatment for nucleation was performed followed by the secondary one for the growth of nucleates. The main crystalline phase formed in the glass-ceramics was β-spodumene and the secondary phase was Li2SiO3. It was recognized that the degree of crystallization of glass-ceramics was increased with a holding time of the secondary heat treatment stage. In the case of the specimens hold up to 3 hour, the crystallization was not completed and the microstructures and morphologies of crystalline phase were not uniform. In the specimens of holding time over 9 hours, the cracks were generated inside of it, so its compressive strength would decrease due them. In conclusion, it was able to obtain the optimum condition to fabriate the glass-ceramics having the properties of high crystallization degree, uniform microstructures and morphologies and the high mechanical strength.

KEYWORDS

Coal bottom ash, Glass-ceramics, 2-Stage heat treatment, Nucleation, Crystal growth, Compressive strength

Citation status

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

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This paper was written with support from the National Research Foundation of Korea.

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