In-situ synthesis of alumina-matrix oxide/oxide composites and performance enhancement by multiple toughening
| Project/Area Number |
23560835
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Structural/Functional materials
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| Research Institution | Tottori University |
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Principal Investigator |
CHEN Zhongchun 鳥取大学, 工学(系)研究科(研究院), 教授 (00282111)
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| Co-Investigator(Renkei-kenkyūsha) |
ONDA Tetsuhiko 鳥取大学, 工学研究科, 准教授 (80273879)
AKAO Takahiro 鳥取大学, 工学研究科, 助教 (70335503)
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| Project Period (FY) |
2011 – 2013
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| Project Status |
Completed (Fiscal Year 2013)
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| Budget Amount *help |
¥5,460,000 (Direct Cost: ¥4,200,000、Indirect Cost: ¥1,260,000)
Fiscal Year 2013: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2012: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2011: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
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| Keywords | 複合材料 / セラミックス / アルミナ / 反応焼結 / In situ合成 / 組織靱化 / 破壊靱性 |
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| Research Abstract |
Alumina matrix composites reinforced with barium hexaluminate and zirconia were synthesized in situ through reactive sintering of alumina and barium zirconate powder mixtures. The in-situ synthesized composites exhibited a microstructural feature of the elongated barium hexaluminate and equiaxed zirconia particles. The formation of Ba-beta-Al2O3 phase with an elongated morphology is likely to be attributed to preferred diffusion of Ba cations along the basal planes. The incorporation of TZP or Y2O3 promotes densification of the composites and formation of tetragonal zirconia due to diffusion of yttria to monoclinic zirconia, which is generated through reaction between alumina and barium zirconate during sintering. The synthesized alumina matrix composites showed high fracture toughness, as a result of multiple toughening effects including crack deflection, crack bridging, and martensitic transformation of zirconia from tetragonal to monoclinic phases.
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Report
(4 results)
Research Products
(30 results)
