| Project/Area Number |
11555194
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 展開研究 |
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| Research Field |
Metal making engineering
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| Research Institution | Kyushu University |
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Principal Investigator |
NAKASHIMA Kunihiko Kyushu University, Graduate School of Engineering, Associate Professor, 工学研究院, 助教授 (10207764)
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| Co-Investigator(Kenkyū-buntansha) |
MORI Katsumi Kyushu University, Graduate School of Engineering, Professor, 工学研究院, 教授 (80037754)
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| Project Period (FY) |
1999 – 2001
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| Project Status |
Completed (Fiscal Year 2001)
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| Budget Amount *help |
¥11,600,000 (Direct Cost: ¥11,600,000)
Fiscal Year 2001: ¥1,200,000 (Direct Cost: ¥1,200,000)
Fiscal Year 2000: ¥4,800,000 (Direct Cost: ¥4,800,000)
Fiscal Year 1999: ¥5,600,000 (Direct Cost: ¥5,600,000)
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| Keywords | Al_2O_3-Y_2O_3-SiO_2 melts / Y-Al-Si-O-N glass melts / nitrogen solubility / viscosity / oxynitride glass / Vicker's hardness / ビッカース硬度 / 窒素 / 溶解度 |
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| Research Abstract |
The viscosity and the solubility of nitrogen using silicon nitride (Si_3N_4) as a source of nitrogen for Al_2O_3-Y_2O_3-SiO_2 melts have been systematically examined. The effects of nitrogen content on viscosity for Y-Al-Si-O-N melts have been also examined. Microhardness of oxide and oxynitride glasses in these systems have been measured.
The viscosities of Al_2O_3-Y_2O_3-SiO_2 melts decreased, and the solubility of nitrogen into the oxide melts increased with increasing Y_2O_3 content. These results could be explained that yttrium ion is a network modifier and the amount of non-bridgeing oxygen increases in the melts.
The viscosities of Y-Al-Si-O-N glass melts and Vicker's hardnes of oxynitride glasses remarkably increased with increasing nitrogen content. These results implied that the trivalent nitrogen substitutes for bivalent oxygen to produce a more tightly linked network and most of the nitrogen is linked to three silocons.
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