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The properties of glass ceramics of Li2O-Al2O3-SiO2 system according to nucleation agent

조핵제 원료에 따른 Li2O-Al2O3-SiO2계 결정화 유리 특성

  • Park, Hyun-Wook (Korea Institute of Ceramic Engineering and Technology, Optic & Display Material Center) ;
  • Lee, Ji-Sun (Korea Institute of Ceramic Engineering and Technology, Optic & Display Material Center) ;
  • Lim, Tae-Young (Korea Institute of Ceramic Engineering and Technology, Optic & Display Material Center) ;
  • Hwang, Jonghee (Korea Institute of Ceramic Engineering and Technology, Optic & Display Material Center) ;
  • Ra, Yong-Ho (Korea Institute of Ceramic Engineering and Technology, Optic & Display Material Center) ;
  • Noh, Myoung-Rae (Samkwang Glass CO. LTD.) ;
  • Seo, Kwan-Hee (Samkwang Glass CO. LTD.) ;
  • Kim, Jin-Ho (Korea Institute of Ceramic Engineering and Technology, Optic & Display Material Center)
  • 박현욱 (한국세라믹기술원 광.디스플레이소재센터) ;
  • 이지선 (한국세라믹기술원 광.디스플레이소재센터) ;
  • 임태영 (한국세라믹기술원 광.디스플레이소재센터) ;
  • 황종희 (한국세라믹기술원 광.디스플레이소재센터) ;
  • 라용호 (한국세라믹기술원 광.디스플레이소재센터) ;
  • 노명래 ((주)삼광글라스) ;
  • 서관희 ((주)삼광글라스) ;
  • 김진호 (한국세라믹기술원 광.디스플레이소재센터)
  • Received : 2018.11.02
  • Accepted : 2018.11.27
  • Published : 2018.12.31

Abstract

The glass-ceramic of $Li_2O-Al_2O_3-SiO_2$ system was synthesized by using $ZrO_2$, $ZrSiO_4$, $ZrOCl_2$ and $Zr(SO_4)_2$, which is a raw material of Zr serving as a nucleation agent. It was confirmed that Avrami parameter of these four glasses is over 3 for bulk crystallization. The glass synthesized by $ZrOCl_2$, and $Zr(SO_4)_2$ showed high melting quality during the melting process. It is also observed that the Zr component is uniformly distributed in the glass. Various characterizations was evaluated, including composition analysis and bending strength.

조핵제 역할을 하는 지르코늄의 원료로써 $ZrO_2$(지르코늄 옥사이드), $ZrSiO_4$(지르코늄 실리케이트), $ZrOCl_2$(지르코늄 옥시클로라이드), $Zr(SO_4)_2$(지르코늄 서페이트) 4종류의 원료를 사용하여 $Li_2O-Al_2O_3-SiO_2$계 결정화 유리를 제조하였다. 동일한 조성의 모든 유리에서 Avrami 상수는 3 이상으로 체적 결정화가 진행됨을 확인하였다. 또한 $ZrOCl_2$, $Zr(SO_4)_2$를 사용하여 제조한 유리는 용융 과정에서 미용융물이 발생하지 않으며 지르코늄 성분이 균일하게 분포되었음을 확인하였다. 이와 같은 결과를 성분 분석, 굽힘 강도를 연계하여 평가하였다.

Keywords

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Fig. 1. DTA corves of the glass samples with different heating rates: (a) ZrO2, (b) ZS, (c) ZOC, (d) ZST.

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Fig. 2. Relationship between ln(T2P/α) and 1/Tp for the glass samples.

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Fig. 3. XRD patterns of las glass-ceramics with different Zr source.

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Fig. 4. Photographs of glass-ceramic surface: (a) ZrO2, (b) ZS, (c) ZOC, (d) ZST.

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Fig. 5. SEM images showing the microstructure of the crystallized glass sample heat 1000℃: (a) ZrO2, (b) ZS, (c) ZOC, (d) ZST.

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Fig. 6. 3-Point flexural strength as a Zr source. For each point, six samples were probed.

Table 1 Oxide composition (wt%) of LAS glass-ceramics

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Table 2 Heat-Treatment of LAS glass-ceramics

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Table 3 The values of activation energy E and Avrami parameter n for crystal growth

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Table 4 ICP result of ZrO2 content

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