- Preparation of Ag Powder by Wet Reduction Method using NaBH4 Reducing Agent
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Chang-Whan Won, Huk-Hee Lee
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J Korean Powder Metall Inst. 2006;13(4):278-284.
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DOI: https://doi.org/10.4150/KPMI.2006.13.4.278
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 Abstract
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- Spherical Ag powder was prepared in the system of AgNO_3;and;NaBH_4 by wet chemical reduction method. The size of Ag powder was increased as the reaction temperature and the concentration of reducing agent was decreased in the constant concentration of dispersion agent. Optimum conditions of producing Ag powder having 1.39µm of D50 was 1M of AgNO_3, 0.5M of NaBH_4, 1.5g of Gelatine in the room temperature.
- The Effect of Adittives on the Sintering Properties of Barium Titanate Powder Prepared by Self-propagating High-temperature Synthesis
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Sung-Jae Lim, Chang-Yun Shin, Hyung-Il Won, Chang-Whan Won
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J Korean Powder Metall Inst. 2006;13(2):129-137.
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DOI: https://doi.org/10.4150/KPMI.2006.13.2.129
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Abstract
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- In this study, high purity fine BaTiO_3 powders were prepared by SHS (Self-propagating High-temperature Synthesis). We would examinate the study of sintering properties and characteristics as a function of temperature with various additives (binder, sintering agent). In separately binder addition, the green and sintered density of specimen were increased as binder content increases. The increased porosity resulted in fine grain size due to the inhibition of grain boundary moving. The Al_2O_3,;TiO_2 and MgO playa role of increasing dielectric constants at room temperature. These values were decreased at curie temperature. In case of SiO_2, the Curie temperature was decreased. In this study, a high dielectric ceramic capacitor material with temperature stability was synthesized by using various additives.
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