The Experts below are selected from a list of 3714 Experts worldwide ranked by ideXlab platform
Keijiro Hiraga - One of the best experts on this subject based on the ideXlab platform.
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High-pressure spark plasma Sintering of MgO-doped transparent alumina
Journal of the Ceramic Society of Japan, 2012Co-Authors: Byung Nam Kim, Hidehiro Yoshida, Keijiro Hiraga, Koji Morita, Haibin Zhang, Salvatore Grasso, Yoshio SakkaAbstract:Transparent alumina doped with MgO is fabricated by spark plasma Sintering (SPS) under high pressures. An optimum Sintering Condition explored by changing the combination of the applied pressure and Sintering temperature led to an in-line transmission close to the maximum reported for alumina in earlier studies. The effects of pressure on both grain size and transmission are strongly dependent on the Sintering temperature: negligible effect at low temperatures and significant effect at high temperatures.
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spark plasma Sintering Condition optimization for producing transparent mgal2o4 spinel polycrystal
Journal of the American Ceramic Society, 2009Co-Authors: Koji Morita, Hidehiro Yoshida, Keijiro HiragaAbstract:By controlling the heating rate at 1300°C, the coalescence of the residual pores and the precipitation of second phases, which are caused by rapid grain growth, degrade the transparency. The present study demonstrates that although the high heating rates have been regarded as a primary advantage for the SPS processing, the low heating rate is highly effective in attaining a high transparency in the spinel even at low temperatures and for short Sintering times.
Hyung-ho Park - One of the best experts on this subject based on the ideXlab platform.
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Microstructures and Thermoelectric Properties of Spark Plasma Sintered In4Se3
Electronic Materials Letters, 2010Co-Authors: Young Soo Lim, Ja Young Cho, Jae-ki Lee, Soon-mok Choi, Kyoung Hun Kim, Won-seon Seo, Hyung-ho ParkAbstract:We report microstructures and thermoelectric properties of In4Se3 thermoelectric materials. In4Se3 powder was synthesized by conventional melting process in evacuated quartz ampoules and Sintering of In4Se3 was performed by spark plasma method at various Sintering temperature. The microstructure and density of the sintered body of In4Se3 were strongly dependent on the Sintering temperature. Thermoelectric properties, such as electrical conductivity, Seebeck coefficient and thermal conductivity, were also characterized and the effects of the Sintering Condition on the thermoelectric properties were investigated.
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Microstructures and Thermoelectric Properties of Spark Plasma Sintered In_4Se_3
Electronic Materials Letters, 2010Co-Authors: Young Soo Lim, Ja Young Cho, Jae-ki Lee, Soon-mok Choi, Kyoung Hun Kim, Won-seon Seo, Hyung-ho ParkAbstract:We report microstructures and thermoelectric properties of In_4Se_3 thermoelectric materials. In_4Se_3 powder was synthesized by conventional melting process in evacuated quartz ampoules and Sintering of In4Se3 was performed by spark plasma method at various Sintering temperature. The microstructure and density of the sintered body of In_4Se_3 were strongly dependent on the Sintering temperature. Thermoelectric properties, such as electrical conductivity, Seebeck coefficient and thermal conductivity, were also characterized and the effects of the Sintering Condition on the thermoelectric properties were investigated.
Byung Hyun Choi - One of the best experts on this subject based on the ideXlab platform.
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effect of b2o3 on the Sintering Condition and microwave dielectric properties of bi4 sio4 3 ceramics
Journal of the American Ceramic Society, 2008Co-Authors: Mi Ri Joung, Jin Seong Kim, Myung Eun Song, Dong Su Paik, Sahn Nahm, Jong Hoo Paik, Byung Hyun ChoiAbstract:B2O3 was added to Bi4(SiO4)3 ceramics to aid the densification process at low temperatures (≤900°C). When the B2O3 content was <3.0 mol%, a porous microstructure developed for the specimens sintered at 875°C. However, when the amount of B2O3 exceeded 3.0 mol%, the Bi4(SiO4)3 ceramics were well sintered even at 875°C for 0.5 h, due to the formation of a liquid phase containing B2O3. The microwave dielectric properties were influenced by the amount of B2O3, and the 3.0 mol% B2O3-added Bi4(SiO4)3 ceramic sintered at 875°C for 1 h showed good microwave dielectric properties of ɛr=15.6, Q×f=36 281 GHz, and τf=−22 ppm/°C.
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Effect of B2O3 on the Sintering Condition and Microwave Dielectric Properties of Bi4(SiO4)3 Ceramics
Journal of the American Ceramic Society, 2008Co-Authors: Mi Ri Joung, Jin Seong Kim, Myung Eun Song, Dong Su Paik, Sahn Nahm, Jong Hoo Paik, Byung Hyun ChoiAbstract:B2O3 was added to Bi4(SiO4)3 ceramics to aid the densification process at low temperatures (≤900°C). When the B2O3 content was
Koji Morita - One of the best experts on this subject based on the ideXlab platform.
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High-pressure spark plasma Sintering of MgO-doped transparent alumina
Journal of the Ceramic Society of Japan, 2012Co-Authors: Byung Nam Kim, Hidehiro Yoshida, Keijiro Hiraga, Koji Morita, Haibin Zhang, Salvatore Grasso, Yoshio SakkaAbstract:Transparent alumina doped with MgO is fabricated by spark plasma Sintering (SPS) under high pressures. An optimum Sintering Condition explored by changing the combination of the applied pressure and Sintering temperature led to an in-line transmission close to the maximum reported for alumina in earlier studies. The effects of pressure on both grain size and transmission are strongly dependent on the Sintering temperature: negligible effect at low temperatures and significant effect at high temperatures.
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spark plasma Sintering Condition optimization for producing transparent mgal2o4 spinel polycrystal
Journal of the American Ceramic Society, 2009Co-Authors: Koji Morita, Hidehiro Yoshida, Keijiro HiragaAbstract:By controlling the heating rate at 1300°C, the coalescence of the residual pores and the precipitation of second phases, which are caused by rapid grain growth, degrade the transparency. The present study demonstrates that although the high heating rates have been regarded as a primary advantage for the SPS processing, the low heating rate is highly effective in attaining a high transparency in the spinel even at low temperatures and for short Sintering times.
Young Soo Lim - One of the best experts on this subject based on the ideXlab platform.
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Microstructures and Thermoelectric Properties of Spark Plasma Sintered In4Se3
Electronic Materials Letters, 2010Co-Authors: Young Soo Lim, Ja Young Cho, Jae-ki Lee, Soon-mok Choi, Kyoung Hun Kim, Won-seon Seo, Hyung-ho ParkAbstract:We report microstructures and thermoelectric properties of In4Se3 thermoelectric materials. In4Se3 powder was synthesized by conventional melting process in evacuated quartz ampoules and Sintering of In4Se3 was performed by spark plasma method at various Sintering temperature. The microstructure and density of the sintered body of In4Se3 were strongly dependent on the Sintering temperature. Thermoelectric properties, such as electrical conductivity, Seebeck coefficient and thermal conductivity, were also characterized and the effects of the Sintering Condition on the thermoelectric properties were investigated.
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Microstructures and Thermoelectric Properties of Spark Plasma Sintered In_4Se_3
Electronic Materials Letters, 2010Co-Authors: Young Soo Lim, Ja Young Cho, Jae-ki Lee, Soon-mok Choi, Kyoung Hun Kim, Won-seon Seo, Hyung-ho ParkAbstract:We report microstructures and thermoelectric properties of In_4Se_3 thermoelectric materials. In_4Se_3 powder was synthesized by conventional melting process in evacuated quartz ampoules and Sintering of In4Se3 was performed by spark plasma method at various Sintering temperature. The microstructure and density of the sintered body of In_4Se_3 were strongly dependent on the Sintering temperature. Thermoelectric properties, such as electrical conductivity, Seebeck coefficient and thermal conductivity, were also characterized and the effects of the Sintering Condition on the thermoelectric properties were investigated.