| 申请日期 | 2025-06-25 | 申请号 | US11153921 |
| 公开（公告）号 | US7211216B2 | 公开（公告）日 | 2007-05-01 |
| 公开国别 | US | 申请人省市代码 | 全国 |
| 申请人 | Yoshimasa Kobayashi; Naohito Yamada; Toru Hayase | ||
| 简介 | An aluminum nitride ceramic including aluminum nitride grains and grain boundary phases comprises a grain boundary phase-rich layer including more amount of the grain boundary phases in a surface layer of the aluminum nitride ceramic than in an inside of the aluminum nitride ceramic. The grain boundary phases in the grain boundary phase-rich layer include at least one of rare earth element and alkali earth element. | ||
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