Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Crystallization Kinetics by Thermal Analysis (DTA) on Starting Glass Compositions for PDP(Plasma Display Panel) Rib

열분석에 의한 PDP 격벽용 출발유리조성의 결정화 특성 연구

  • Jeon, Young-Wook (Department of Inorganic Materials Engineering, Pusan National University) ;
  • Cha, Jae-Min (Department of Inorganic Materials Engineering, Pusan National University) ;
  • Kim, Dae-Whan (Department of Inorganic Materials Engineering, Pusan National University) ;
  • Lee, Byung-Chul (Department of Inorganic Materials Engineering, Pusan National University) ;
  • Ryu, Bong-Ki (Department of Inorganic Materials Engineering, Pusan National University)
  • 전영욱 (부산대학교 무기재료공학과) ;
  • 차재민 (부산대학교 무기재료공학과) ;
  • 김대환 (부산대학교 무기재료공학과) ;
  • 이병철 (부산대학교 무기재료공학과) ;
  • 류봉기 (부산대학교 무기재료공학과)
  • Published : 2002.01.01
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Abstract

In order to overcome trade-off among compositions, process and properties of the glasses with high PbO-base composition for PDP Rib, we studied glass crystallization and crystallization kinetics by Differential Thermal Analysis(DTA). Glass powder was obtained through melting/cooling/grinding, with 3 wt%TiO2 addition for the crystal nucleation and growth in $62PbO-19B_2O_3-10SiO_2-9(Al_2O_3-K_2O-BaO-ZnO)$(in wt%) composition glass. This powder was heat-treated for 1 to 10 h at $445^{\circ}C$ for nucleation. DTA measurements were performed to obtain the crystallization peak with $5∼25^{\circ}C/min$ heating rates. DTA crystallization peak temperature increased with increasing the heating rate and decreased with increasing the heating time. Because the Avrami parameter (n) was approximately 1, the surface crystallization occurred. The maximum nucleation time was 2 h.

고함량 PbO계 조성 PDP 격벽용 유리의 경우, 광학적, 기계적 및 전기적 물성들을 만족시키며, 동시에 높은 온도에서 열처리공정을 거쳐야 하므로, 유리의 조성-물성-공정상의 trade-off가 발생하여, 이를 극복하기 위한 방안으로서 유리의 결정화가 유효하다. 이에 본 연구에서는 고함량 PbO계 조성 PDP 격벽용 후보 유리계의 최적결정화조건을 확립하고자 열시차분석법(DTA)에 의한 결정화 특성을 연구하였다. $62PbO-19B_2O_3-10SiO_2-9(Al_2O_3-K_2O-BaO-ZnO)$(in wt%) 조성계의 유리에 결정핵생성 및 성장을 위해 $TiO_2$를 3 wt%를 첨가한 수, 용융/냉각/분쇄 처리 후 얻어진 유리 분말을 $445^{\circ}C$에서 각각 1∼10시간 열처리하여 핵생성을 시켰으며, 이렇게 얻어진 각 유리 분말은 각기 $5∼25^{\circ}C/min$의 가변 승온속도로 DTA 측정을 하였다. DTA 결정화 피크 온도는 승온속도가 높아짐에 따라 증가하였고, 열처리 시간이 증가함에 따라 감소하였다. Avrami 변수는 1에 근사하는 값이 얻어져서, 표면결정화가 우선하였으며, 최대 핵생성 처리시간은 2시간이었다.

Keywords

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