Development of low-temperature high-strain-ratesuperplastic ceramics through controlling grain-boundary segregation and nonstoichiometry in oxide ceramics
| Project/Area Number |
21360328
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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 |
Inorganic materials/Physical properties
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| Research Institution | Kitami Institute of Technology (2012)
National Institute for Materials Science (2009-2011) |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
KIM Byung-nam (独)物質・材料研究機構, 主席研究員 (50254149)
MORITA Koji (独)物質・材料研究機構, 主幹研究員 (20354186)
YOSHIDA Hidehiro (独)物質・材料研究機構, 主幹研究員 (80313021)
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| Co-Investigator(Renkei-kenkyūsha) |
SAKKA Yoshio (独)物質・材料研究機構, ユニット長 (00354217)
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| Project Period (FY) |
2009 – 2012
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| Project Status |
Completed (Fiscal Year 2012)
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| Budget Amount *help |
¥17,810,000 (Direct Cost: ¥13,700,000、Indirect Cost: ¥4,110,000)
Fiscal Year 2012: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2011: ¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2010: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2009: ¥6,760,000 (Direct Cost: ¥5,200,000、Indirect Cost: ¥1,560,000)
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| Keywords | 構造用セラミックス / 高速超塑性 / 微細粒緻密化 / 不定比化合物 / 固溶体 / 微結晶粒酸化物 / 粒界偏析 / 不定比性 / 局所応力緩和 |
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| Research Abstract |
In tetragonal ZrO_2.base oxides, material conditions were investigated for the occurrence of high-strain-rate superplasticity (HSRS) at lower temperatures. Even in undoped high-purity Y-TZP, HSRS was found to occur for a certain combination of the grain size and sintered density. For this combination, positive effects were limited for minor additions of other cations and for the dispersion of some cubic phases. For attaining HSRS at lower temperatures, fine grain sizes smaller than 0.2 μm is necessary in addition to nearly supersaturating cation doping or the dispersion of nonstoichiometric cubic phases. The results also indicated that a transition in the mechanisms of pore annihilation and growth is important for material processing and superplastic deformation, respectively.
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Report
(5 results)
Research Products
(101 results)
