Microstructural analysis of coal bottom ash-Na2O-Li2O system glass-ceramics (석탄 바닥재-Na2O-Li2O계 결정화 유리의 미세구조 분석)

KANG SEUNG GU (강승구)

Microstructural analysis of coal bottom ash-Na2O-Li2O system glass-ceramics

Journal of the Korean Crystal Growth and Crystal Technology
Abbr : J. Korean Cryst. Growth Cryst. Technol.
2009, 19(1), pp.25~32
Publisher : The Korea Association Of Crystal Growth, Inc.
Research Area : Engineering > Materials Science and Engineering

KANG SEUNG GU ¹

¹경기대학교

Accredited

ABSTRACT

The glass-ceramics composed of coal bottom ash produced from a thermal power plant, Na2O and Li2O as a flux agent and TiO2 as a nucleation agent were fabricated and its microstructures were analyzed. The nepheline was a major crystal phase in the glass-ceramics fabricated and its amount increased with TiO2 addition. The glass-ceramics without TiO2 addition had the thick surface crystals induced by a surface-crystallization mechanism and no crystal in the interior matrix. The surface crystallization, however, was restrained and the interior matrix was completely crystallized showing dendrite shape spread with fine particles < 1 μm when added with TiO2 above 4 wt%. For the glass-ceramics containing 6 wt% TiO2, the 5 μm-long dendrite crystals were interlocked each other which could suppress the crack propagation effectively at the external loading applied.

KEYWORDS

Coal bottom ash, Glass-ceramics, TiO2, Nepheline, Bulk crystallization, Surface crystallization

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