2019 Fiscal Year Final Research Report
Application of electrophoretic method to forming of functionally graded piezoelectric materials and its strength characteristics
| Project/Area Number |
17K06060
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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 |
Materials/Mechanics of materials
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| Research Institution | Kochi University of Technology |
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Principal Investigator |
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| Project Period (FY) |
2017-04-01 – 2020-03-31
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| Keywords | 傾斜機能圧電材料 / 電気泳動堆積法 / 曲げ強度 |
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| Outline of Final Research Achievements |
Mechanical properties of continuous functionally graded piezoelectric ceramics formed by electrophoretic deposition (EPD) method were clarified. As the EPD suspensions, two kinds of lead niobate nickelate-lead zirconate titanate (PNN-PZT) calcined powders were mixed with ethanol solvent respectively. First, we found the optimum process conditions for EPD in this system. Functionally graded piezoelectric ceramics were formed by depositing ceramics while changing the mixing ratio of the suspension continuously. It was found that the functionally graded piezoelectric ceramics with high strength can be obtained by compressing the EPD formed material before sintering. The sintered ceramics had a dense microstructure, and its three-point bending strength was about three times higher than that of the molded material made by EPD only.
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| Free Research Field |
材料強度学
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| Academic Significance and Societal Importance of the Research Achievements |
屈曲変位を出力する圧電アクチュエータの代表的なものはバイモルフ型と呼ばれる金属製シム板と圧電セラミックスを接合した構造を有する．このタイプのアクチュエータでは異種材料を接合しているため，長期使用に対する強度信頼性が低い．これに対し単一材料内で圧電特性を傾斜させたセラミックスを用いるモノモルフ型ではこの欠点を除くことができる．本研究では電気泳動堆積法によりこの傾斜機能圧電セラミックスを作製した時の強度特性を明らかにしたことにより，この成形法によるモノモルフ型アクチュエータの実用化に対し重要な知見が得られた．
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