Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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A Study of Structure and Thermal Properties of K2O·CaO·P2O5 Glasses

K2O·CaO·P2O5계 유리의 열적특성과 구조분석

  • Yoon, Young-Jin (Department New Material Science and Engineering, Dankook University) ;
  • Yoon, Tae-Min (Department New Material Science and Engineering, Dankook University) ;
  • Lee, Yong-Soo (Department New Material Science and Engineering, Dankook University) ;
  • Kang, Won-Ho (Department New Material Science and Engineering, Dankook University)
  • 윤영진 (단국대학교 신소재공학과) ;
  • 윤태민 (단국대학교 신소재공학과) ;
  • 이용수 (단국대학교 신소재공학과) ;
  • 강원호 (단국대학교 신소재공학과)
  • Published : 2002.01.01
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Abstract

Various composition of $K_2O{\cdot}CaO{\cdot}P_2O_5$ glasses were studied by melting process to identify glass forming region. Thermal properties were observed by DSC and TG-DTA, structural properties were investigated by FT-IR and Raman Spectroscopy. The glass transition temperature (Tg) and softening temperature (Ts) were decreased with increasing $K_2O\;and\;P_2O_5$ contents. The basic structural unit of phosphate glasses is the $PO_2\;and\;PO_4^{3-}$ groups to make a cross-link and P-O-P group to form skeleton structure. As CaO content was increased, the P-O-P field strength in these glass was increased and intensity of $PO_2\;and\;PO_4^{3-}$ stretch was decreased.

$K_2O{\cdot}CaO{\cdot}P_2O_5$를 기본조성으로 하여 용융법에 의해 유리 형성범위를 정의하고자 하였다. TG-DTA와 DSC를 이용하여 열적 특성을 관찰하고자 하였으며, FT-IR과 Raman Spectroscopy를 이용하여 구조를 분석하였다. $K_2O{\cdot}CaO{\cdot}P_2O_5$의 함량이 증가함에 따라 유리전이온도 및 연화온도는 감소하였다. $K_2O{\cdot}CaO{\cdot}P_2O_5$ 유리의 기본 구조는 이웃한 구조와 상호 결합을 위한 $PO_2$와 $PO_4^{3-}$ 구조와 유리의 골격구조를 이루는 P-O-P 결합이며, CaO의 함량이 증가함에 따라, 유리내의 P-O-P의 결합력은 점차적으로 증가하였으며, $PO_2$와 $PO_4^{3-}$의 intensity는 점차적으로 감소하였다.

Keywords

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