${Nd_2}{O_3}-{Al_2}{O_3}-{SiO_2}$ 계의 결정화유리의 물성

Properties of Glass-Ceramic in ${Nd_2}{O_3}-{Al_2}{O_3}-{SiO_2}$System

  • 최우형 (순천대학교, 공과대학, 재료, 금속공학과) ;
  • 김형순 (순천대학교, 공과대학, 재료, 금속공학과)
  • 발행 : 2001.07.01

초록

고온 안정성의 유리계로 알려진 회토류 알루미나 규산염계중, Nd$_2$O$_3$-Al$_2$O$_3$-SiO$_2$(NdAS)계 유리의 응용범위를 찾고자 결정화유리를 제조하여 그 물성의 특성을 평가하였다. NdAS에 결정화제로 TiO$_2$를 첨가하여 내부결정화를 유도하여 생성된 결정화유리에 대하여 결정상과 잔류유리의 물리적, 열적, 기계적 물성을 측정하였다. NdAS-TiO$_2$유리계는 열처리와 조성 조건에 따라 생성된 표면 및 내부결정상은 같은 결정상을 갖는 것으로 X선회절의 결과로 확인되었으나, 알려 있지 않은 결정상으로 내부결정의 경우, 원자구성비는 $Nd_{4.6}Si_{7.2}Al_{4.0}Ti_{2.4}O_{32}$이었다. 결정화유리의 선팽창계수는 $5.4~6.2{\times}10^{-6}/^{\circ}C$ 정도로 경정성장이 일어날수록 증가되었다. 결정화유리중의 결정상의 경도와 탄성계수는각 각 12GPa, 220Gpa으로 나타난 것을 고려한다면 내부결정화에 의한 결정화유리의 물성은 고온 구조용 재료로 활용도가 넓을 것으로 본다.

Glass-ceramics were prepared and evaluated for the properties to expand the scope of application of the rare earth aluminosilicate glasses, A glass-ceramic added with $TiO_2$as a nucleating agent, which was crystallized internally and it was characterized for physical, thermal and mechanical properties of crystal and residual glass in the glass-ceramic, X-ray diffractometer reveals an unknown crystal as $Nd_{4.6}Si_{7.6}Al_{4.0}Ti_{2.4}O_{32}$ which was found in surface and internal crystals dependent on composition and heat treatments. The thermal expansion coefficients of glass-ceramics were $5.4~6.2{\times}10^{-6}/^{\circ}C$, which increased with increasing crystal growth. Considering that the hardness and the elastic constant of crystal in glass-ceramics are 12GPa and 220GPa, respectively, the application of the glass-ceramics would be applicable for structural materials at elevated temperature.

키워드

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