2021 Fiscal Year Final Research Report
Development of Ceramic AM Method by Local Flash Sintering
| Project/Area Number |
19K14868
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| Research Category |
Grant-in-Aid for Early-Career Scientists
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| Allocation Type | Multi-year Fund |
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| Review Section |
Basic Section 18020:Manufacturing and production engineering-related
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| Research Institution | Tokyo Metropolitan Industrial Technology Research Institute |
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Principal Investigator |
Okubo Satoshi 地方独立行政法人東京都立産業技術研究センター, 開発本部物理応用技術部機械技術グループ, 副主任研究員 (30757349)
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| Project Period (FY) |
2019-04-01 – 2022-03-31
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| Keywords | Additive Manufacturing / フラッシュ焼結 |
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| Outline of Final Research Achievements |
To establish a binder-less ceramic additive manufacturing, this study focused on the application of flash sintering, which can shorten the sintering time by applying an electric field at high temperature. To apply flash sintering to AM, a local flash sintering system was constructed that can selectively sinter ceramic powder locally using a needle electrode. Although conventional flash sintering has used pressed compacts, it was clear that flash sintering occurs even in the powder layer as long as a load is applied. However, sintering was difficult due to atmosphere discharge at powder layer thickness of 1 mm or less. The application of the local flash sintering method to AM still has issues to be considered for atmospheric discharge.
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| Free Research Field |
アディティブマニュファクチュリング
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| Academic Significance and Societal Importance of the Research Achievements |
本研究では針状電極／リング状電極および針状電極／板状電極の組み合わせでフラッシュ焼結実験が行われ，針状電極／板状電極の組み合わせでのみフラッシュ焼結が確認された．これはフラッシュ焼結の焼結機構が，通電によるジュール発熱の物理的効果によるものであることを支持している．また，粉末層厚さ1mm以下での大気放電は，大気の絶縁抵抗が粉末の電気抵抗よりも小さくなることが原因であり，粉末材料の微細化などによって通電パスを増加させることで解決すると考えられる．したがって，今後の改善によって局所フラッシュ焼結によるバインダーレスセラミックスAMの実現が期待される．
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