• Title/Summary/Keyword: 유리세라믹화

Search Result 152, Processing Time 0.025 seconds

Effect of softening point of glass frit on the sintering behavior of low-temperature cofitrable glass/ceramic composites (유리 프릿트의 연화점이 저온소성용 글라스/세라믹 복합체의 소결거동에 미치는 영향)

  • 구기덕;오근호
    • Journal of the Korean Crystal Growth and Crystal Technology
    • /
    • v.8 no.4
    • /
    • pp.619-625
    • /
    • 1998

  • The effect of softening point and glass amount of glass frit on the sintering behavior of low temperature cofirable glass/ceramic composites was studied and according to these results, glass/ceramic composites with high sintered density was fabricated. The density of composites was increased as the glass amount was increased. In case of using the glass with low softening point, the deformation of specimen was occurred though the ratio of the glass amount in the specimen was low. But, in case of using the glass with high softening point, the sintered density of composites was increased in accordance with glass amount. With the specimen of high softening point, the deformation was not happened. Therefore, it was found that the densification was progressed continuously in high glass amount. From the study on the effect of softening point of glass on sintering behavior, the suitable softening point and glass amount for fabrication of glass/ceramic composites can be anticipated. When glass frit with softening point of $790^{\circ}C$ was chosen according to this result, low temperature cofirable glass/ceramic composites with high density (97%) at $900^{\circ}C$ was fabricated.

  • PDF

Development of novel oxyfluoride glasses and glass ceramics for photoluminescence material by a containerless processing (무용기 용융법을 활용한 형광소재용 결정화 유리 개발)

  • Hyerin Jo;Minsung Hwang;Youngjin Lee;Jaeyeop Chung
    • Journal of the Korean Crystal Growth and Crystal Technology
    • /
    • v.33 no.5
    • /
    • pp.181-186
    • /
    • 2023

  • In this study, novel Eu2O3-BaF2-La2O3-B2O3 oxyfluoride glasses and glass ceramics were developed by a containerless processing. Differential thermal analysis (DTA) analysis was performed to analyze the thermophysical properties of oxyfluoride glasses doped with Eu2O3, and photoluminescence (PL) characteristics were analyzed to evaluate the luminous efficiency depending on the degree of crystallinity. The glass transition temperature decreased with increasing BaF2 concentration since BaF2 acts as a network modifier in this glass system. In addition, thermal stability which can be estimated by the difference between the glass transition temperature and the onset temperature of the crystallization decreased with increasing BaF2 contents. The peak related to the BaF2 crystal was confirmed after the crystallization by X-ray Diffraction (XRD) analysis. Photoluminescence intensity increased after the crystallization which indicates that the Eu3+ ions are sited in BaF2 crystal. La 3d5/2 x-ray photoelectron spectroscopy (XPS) and F1s XPS spectra were analyzed to precisely understand the behavior of the fluorine ion in the glass structure. Fluorine tends to bond with the network modifying cations such as La3+ and Ba2+ ions and after the crystallization the La-F bonds decreased because F- ions used to form BaF2 crystals.

  • https://doi.org/10.6111/JKCGCT.2023.33.5.181 인용 PDF