Influence of zirconia addition on reaction bonded silicon nitride produced from various silicon particle sizes(<Feature>SiAlons and Non-oxides)
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概要
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Reaction bonded silicon nitride ceramics have been produced from Si powders of different particle size and both with and without zirconia as a nitride catalyzing element. The effect of the ZrO_2 on the nitridation rate of the specimens was studied as a function of temperature, and the mechanism of enhanced nitridation was discussed. At all temperatures, the degree of nitridation of specimens sintered with ZrO_2 was higher than those without additions for all particle sizes. In the case of nitridation of specimens produced without ZrO_2, the degree of nitridation was dependent on particle size, with larger sizes resulting in less nitridation. For specimens with ZrO_2 the finest powder also showed highest transformation, but there was no difference in the degree of nitridation of medium and coarse powders. It was found that during heating of the specimens the ZrO_2 was transformed to ZrN at low temperature and enhanced nitridation is considered to be due to this phase re-converting to ZrO_2 at higher temperature and thereby supplying nitrogen to the interior of the specimens. At lower temperatures, the strength of the specimens with ZrO_2 were higher than those without, attributed to the enhanced nitridation. However, comparing strengths of fully nitrided specimens, those with ZrO_2 were lower than those without, thought to be due to the presence of ZrO_2 particles disrupting the connectivity of adjacent silicon nitride grains.
- 社団法人日本セラミックス協会の論文
- 2008-06-01
著者
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KITA Hideki
National Institute of Advanced Industrial Science and Technology (AIST)
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KONDO Naoki
National Institute of Advanced Industrial Science and Technology (AIST)
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HYUGA Hideki
National Institute of Advanced Industrial Science and Technology (AIST)
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Yoshida Katsumi
Research Laboratory for Nuclear Reactors, Tokyo Institute of Technology
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近藤 直樹
産業技術総合研究所シナジーマテリアル研究センター
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Kondo N
Aist Jpn
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Hyuga Hideki
National Institute Of Advanced Industrial Science & Technology Aist
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Kondo Naoki
National Industrial Research Institute Of Nagoya
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Okano Hiroaki
Kubota Corporation
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Kondo Naoki
Synergy Materials Research Center National Institute Of Advanced Industrial Science And Technology
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Kita H
Advanced Manufacturing Res. Inst. National Inst. Of Advanced Industrial Sci. And Technol. (aist)
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YOSHIDA Katsumi
Tokyo Institute of Technology
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SUGAI Jun
Kubota Corporation
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TSUCHIDA Jiro
Kubota Corporation
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コンドウ ナオキ
Synergy Materials Research Center National Institute Of Advanced Industrial Science And Technology (
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Kita Hideki
National Inst. Of Advanced Industrial Sci. And Technol. (aist)
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