서지주요정보
코디어라이트계 유리의 결정화에 관한 연구 = A study on the crystallization behavior of cordierite-based glass
서명 / 저자 코디어라이트계 유리의 결정화에 관한 연구 = A study on the crystallization behavior of cordierite-based glass / 손용배.
발행사항 [대전 : 한국과학기술원, 1994].
Online Access 원문보기 원문인쇄

소장정보

등록번호

8004262

소장위치/청구기호

학술문화관(문화관) 보존서고

DMS 94001

휴대폰 전송

도서상태

이용가능

대출가능

반납예정일

리뷰정보

초록정보

The cordierite ($2MgO2Al_2O_35SiO_2$)-based glass-ceramic system is a potential candidate for an alternative substrate material for high-speed circuits due to its low-dielectric constant, low temperature sintering capability and a thermal expansion coefficient matching with that of Si chips. To improve the mechanical properties with the low dielectric constant, cordierite-mullite composite material has been studied. Previous works have concentrated on the densification of cordierite-mullite ceramics at temperatures above 1465℃, where the cordierite melts down to the liquid phase. In order to fabricate a multilayered structure cofired with highly conductive electrodes such as Au, Cu and Ag-Pd, the sintering temperature should be reduced to below 1000℃. It was suggested that cordierite-mullite composite could be fabricated at temperatures below 1000℃ using glass precursor powder rather than colloidal precursor, since glass is a very homogeneous system on an atomic scale. Many studies have reported on the crystallization mechanism of cordierite glass or cordierite glass with excess $SiO_2$ and MgO, which is close to the ternary eutectic point, but limited study has been carried out on the cordierite-mullite (cordierite with excess $Al_2O_3$ and $SiO_2$ system, since it is not the stable glass-forming region. The effect of the glass phase separation on the nucleation behavior has been associated with many factors, such as the formation of an amorphous phase with relatively high mobility, phase boundary as a nucleating site for the first crystalline phase and reduction of the energy barrier due to the compositional change. Fine-grained homogeneous composite glass ceramics can be produced by controlled phase separation in the range of 10-50Å. The present study is concerned with the nucleation and crystallization behavior of cordierite-based glass with excess $SiO_2$ and $Al_2O_3$ (CM glass). Transmission electron microscopical studies on the microstructural evolution have been emphasized. Glass-in-glass phase separation and its effects on the nucleation and crystallization behavior of CM glass were examined. Crystallization behavior of cordierite-based glass with excess $SiO_2$ and $Al_2O_3$ (CM glass) was studied at the initial crystallization stage. Two kinds of glass-in-glass phase separation occurred during the heat treatment of glass powder. The secondary glass-in-glass phase separation, which consists of an $SiO_2$-rich phase and an $Al_2O_3$-rich phase significantly affects the crystallization of the glass and the resultant microstructures of the crystallized glass. Mullite nucleated first in the $Al_2O_3$-rich amorphous phase which is no longer stable glass-forming region. Metastable m-cordierite crystallized in the SiO2-rich amorphous phase and grew rapidly. A fine-grained cordierite-mullite composite with mullite as the grain boundary phase could be produced.

서지기타정보

서지기타정보
청구기호 {DMS 94001
형태사항 ix, 99 p. : 삽도 ; 26 cm
언어 한국어
일반주기 저자명의 영문표기 : Yong-Bai Son
지도교수의 한글표기 : 김종희
공동교수의 한글표기 : 장성도
지도교수의 영문표기 : Chong-Hee Kim
공동교수의 영문표기 : Sung-Do Jang
학위논문 학위논문(박사) - 한국과학기술원 : 재료공학과,
서지주기 참고문헌 : p. 96-99
주제 Metals --Mechanical properties.
Glass-ceramics.
Microstructure.
Cordierite.
유리 세라믹. --과학기술용어시소러스
결정화. --과학기술용어시소러스
기판. --과학기술용어시소러스
미세 구조. --과학기술용어시소러스
Crystallization.
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