Download file (7.36MB)
Download as zip (7.24MB)

コレクション

引用

説明:

A technique to heal microcracks on ceramic surfaces in a relatively short time is an attractive proposition for extending the lifetime of ceramics. To this end, we used the ultrafast high-temperature sintering (UHS) method, which permits a rapid temperature increase, to heal Vickers indentation microcracks generated in a 4 mol% Y2O3-doped ZrO2 polycrystal. We examined the microstructure following microcrack healing using transmission electron microscopy and scanning electron microscopy with continuous focused ion beam slicing along the microcrack plane. This revealed that the microcrack healing process involves crack pinching and neck formation, followed by the growth of the neck. The microcracks were fully healed at the surface by UHS treatment at 2000 C for 20 s. However, residual pores corresponding to the unhealed state were observed inside the material. We hypothesized that these pore residues were caused by significant grain coarsening during UHS. It is essential to optimize the UHS temperature and time to account for grain coarsening and facilitate the application of this method to microcrack healing.

権利情報:

• In Copyright
  

キーワード: ultrafast high-temperature sintering (UHTS), microcrack healing, Vickers

刊行年月日: 2024-11-26

出版者: Elsevier BV

掲載誌:

• Ceramics International (ISSN: 02728842) vol. 51 issue. 4 p. 4178-4184

研究助成金:

• Ministry of Education, Culture, Sports, Science and Technology JPMXP1224NU0038
• Japan Science and Technology Agency
• Core Research for Evolutional Science and Technology JPMJCR1996

原稿種別: 査読前原稿 (Author's original)

MDR DOI: https://doi.org/10.48505/nims.5321

公開URL: https://doi.org/10.1016/j.ceramint.2024.11.394

関連資料:

その他の識別子:

連絡先:

更新時刻: 2025-02-12 16:30:15 +0900

MDRでの公開時刻: 2025-02-12 16:30:16 +0900