- Fabrication of ZnS-SiO2 Composite and its Mechanical Properties
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Dae-Hoon Shin, Gil-Su Kim, Young-Jung Lee, Hoon Cho, Young-Do Kim
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J Korean Powder Metall Inst. 2008;15(1):1-5.
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DOI: https://doi.org/10.4150/KPMI.2008.15.1.001
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 Abstract
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- ZnS-SiO_2 composite is normally used for sputtering target. In recent years, high sputtering power for higher deposition rate often causes crack formation of the target. Therefore the target material is required that the sintered target material should have high crack resistance, excellent strength and a homogeneous microstructure with high sintered density. In this study, raw ZnS and ZnS-SiO_2 powders prepared by a 3-D mixer or high energy ball-milling were successfully densified by spark plasma sintering, the effective densification method of hard-to-sinter materials in a short time. After sintering, the fracture toughness was measured by the indentation fracture (IF) method. Due to the effect of crack deflection by the residual stress occurred by the second phase of fine SiO_2, the hardness and fracture toughness reached to 3.031 GPa and 1.014MPacdotm1/2, respectively.
- Sintering Behavior and Mechanical Property of Mo Nanopowders
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Hai-Gon Kim, Gil-Su Kim, Sung-Tag Oh, Myung-Jin Suk, Young-Do Kim
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J Korean Powder Metall Inst. 2007;14(6):386-390.
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DOI: https://doi.org/10.4150/KPMI.2007.14.6.386
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Abstract
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- The sintering behavior and mechanical property of Mo nanopowder was investigated as a function of various sintering condition. Mo oxide nanopowders were milled using a high energy ball-milling process. After the ball milling for 20h, the crystalline size of MoO_3 was about 20 nm. The MoO_3 nanopowders were reduced at the temperature of 800°C without holding time in H_2 atmosphere. The sinterability of Mo nanopowder and commercial Mo powder was investigated by dilatometric analysis. Mo nanopowder and commercial Mo powder were sintered at 1200°C for 1 hand 1500°C for 3 h, respectively. In both specimens the measured relative density was about 95%. But the measured hardness values were 2.34 GPa for nanopowder and 1.87 GPa for commercial powder. Probably due to finer grain size of the sintered body prepared from Mo nanopowder than that prepared using commercial Mo powder. The mean grain sizes were measured to be about 1.4 mm and 6.2 mm, respectively.
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