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Study on the Water Durability of Molybdate Glasses with B2O3 as Low Temperature Sealing Materials
Jae-Young Shin, Jae-Min Cha, Dae-Sung Kim, Dea-Geol Jeong, Jun-Hyeon Bae, Bong-Ki Ryu
Korean J. Met. Mater. 2017;55(12):905-910.   Published online 2017 Dec 4
DOI: https://doi.org/10.3365/KJMM.2017.55.12.905

The boron alkali molybdate glass system was investigated as lead-free low-temperature melting sealing materials, with different boron oxide contents between 0 and 8 mol%. The glasses were characterized using X-ray diffraction (XRD), differential scanning calorimetry (DSC), infrared spectroscopy (IR), and by densities. Their chemical properties were measured by their dissolution..... More

Sol-Gel Synthesis of Phosphate-Based Glasses for Hydrophilic Enamel Applications
졸-겔법을 이용한 친수 기능성 법랑용 인산염계 유리 합성
Dae-Sung Kim, Bong-ki Ryu
김대성, 류봉기
Korean J. Met. Mater. 2017;55(4):284-289.   Published online 2017 Apr 6
DOI: https://doi.org/10.3365/KJMM.2017.55.4.284

In this study, quaternary phosphate-based sol-gel derived glasses were synthesized from a P2O5-CaO-Na2O-TiO2 system with a high TiO2 content of up to 50 mol%. The sol-gel method was chosen because incorporating a high percentage of titanium into a phosphate network via traditional melt-quench methods is non-trivial. The structure and thermal..... More

Effects of Melting Conditions on Cerium oxidation state and Catalytic Behavior on Cerium Phosphate Glasses
세륨 인산염계 유리에서 세륨의 산화수와 촉매특성에 대한 용융조건의 영향
Ju-Hyeong Kim, Dae-Sung Kim, Bong-Ki Ryu
김주형, 김대성, 류봉기
Korean J. Met. Mater. 2017;55(2):144-149.   Published online 2017 Feb 2
DOI: https://doi.org/10.3365/KJMM.2017.55.2.144

As with any solvent, stabilizing a multivalent element at a given oxidation level in the glass depends on the thermodynamic conditions. The effects of temperature in the oxidation-reduction equilibrium have been previously noted with higher temperatures being conductive to reduced states. 30Ce2O-70P2O5 binary system glasses were prepared. The effects of..... More

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