Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Effect of HF Treatment on the Crystallization Behavior of the Glass Containing Coal Bottom Ashes

석탄바닥재가 포함된 유리의 결정화 특성에 미치는 HF 처리 효과

  • Jo, Si-Nae (Department of Materials Engineering, Kyonggi University) ;
  • Kang, Seung-Gu (Department of Materials Engineering, Kyonggi University)
  • 조시내 (경기대학교 신소재공학과) ;
  • 강승구 (경기대학교 신소재공학과)
  • Received : 2010.12.30
  • Accepted : 2011.01.17
  • Published : 2011.01.31
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Abstract

The crystallization behavior and microstructural change of the glass-ceramics were analyzed as a function of concentration and etching time of the HF solution in order to enhance the degree of crystallinity induced by heterogeneous nucleation of glass of bottom ash containing 15 wt% $Li_2O$. The nucleation site seemed to be generated where the Si ion was eluted. The main crystal phases in the glass-ceramics fabricated in this study were $\beta$-spodumene and $Li_2SiO_3$. The specimens etched with HF of 0.5 vol% within 0~60 seconds showed increased crystalline peak intensities in XRD pattern with etching time compared to no-etched one. Also the crystal size and crystal occupancy in the glass matrix observed by SEM were increased with etching time. For the glass-ceramics etched with 1.0 and 2.0 vol% HF solution, the etching time over 10 s was not effective to increase the crystallinity. From this study, it was found that the glass-ceramics with the higher crystallinity could be obtained by HF-etching followed by heat treatment process, even though the nucleating agent or 2-stages thermal treatment process were not used.

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References

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