2002 Fiscal Year Final Research Report Summary
Measurements of the deformation stress of molten mold fluxes
| Project/Area Number |
13450303
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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 | 一般 |
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| Research Field |
Metal making engineering
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| Research Institution | HOKKAIDO UNIVERSITY |
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Principal Investigator |
SASAKI Yasushi Hokkaido Univ., Grad. School of Eng., Inst., 大学院・工学研究科, 助手 (90281782)
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| Co-Investigator(Kenkyū-buntansha) |
IGUCHI Manabu Hokkaido Univ., Grad. School of Eng., Prof., 大学院・工学研究科, 教授 (00043993)
KUDOH Masayuki Hokkaido Univ., Grad. School of Eng., Prof., 大学院・工学研究科, 教授 (00001248)
ISHII Kuniyoshi Hokkaido Univ., Grad. School of Eng., Prof., 大学院・工学研究科, 教授 (00001214)
KASHIWAYA Yoshiaki Hokkaido Univ., Grad. School of Eng., Assoc. Prof.., 大学院・工学研究科, 助教授 (10169435)
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| Project Period (FY) |
2001 – 2002
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| Keywords | Mold Flux / Deformation stress / Glass phase / Raman spectroscopy / Rheological body |
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| Research Abstract |
To determine the effect of F ions in the molten alkali silicate systems, quenched Na__2O-SiO__2-NaF systems were investigated by Raman spectroscopy and molecular dynamics simulation in 2002 term. The systematic increase of 1100 cm^<-1> band intensity in the Raman spectra of the silicate melts accompanying the replacement of F for O provides the evidence for concomitant polymerization of melts. From the molecular dynamics simulation, it was confirmed that most of substituted F was mainly coordinated to Na^+ ions but not Si^<4+> ions at least up to 10 mol% of F. A small amount of F was found to be coordinated to Si as a non-bridging ion from the MD simulation, although there was no recognizable evidence from Raman spectroscopy. These results are consistent with the mechanism in which F associated with otherwise network-modifying Na rather than with network-forming Si. Since F was associated to Na^+ ions, the replace of O ion by two F ions promote the polymerization of silicate melts.
In 2003 term, by using a newly developed ultra micro stress measurement system, the deformation behavior of molten CaO-Al_2O_3-SiO_2 system at 1673K with varying Al_2O_3 content and compress speed was investigated. It was found that the deformation stress was increased with increase of Al_2O_3 content. Al ion is know to have a preference to construct three-dimensional network structure. This is the one of the reason of increase of deformation stress with Al_2O_3.
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Research Products
(2 results)
