在化陶中通过连贯接口的粘合切换进行塑料变形
Jie Zhang1, Guanghua Liu1, Wei Cui1
1State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, P.R. China.
概括
研究人员通过设计双相结构来开发可变形的化陶. 这种设计使得应力诱导的相变成为可能,克服了联材料的固有脆性.
科学领域:
- 材料科学
- 陶工程
- 固体机械学
背景情况:
- 聚合陶具有极好的硬度和耐热性.
- 由于它们在室温下极其脆弱, 它们的广泛使用受到限制.
- 脆性来自强大的定向共价键,需要在压力下断裂.
研究的目的:
- 设计和制造可变形的共价粘合陶.
- 为了克服化 (Si3N4) 等材料固有的脆性.
- 通过一种新的结构方法使陶具有塑性变形.
主要方法:
- 在化物 (Si3N4) 陶中设计双相结构.
- 在材料的各个阶段之间建立连贯的接口.
- 使用应力诱导的相位转换,通过界面上的键交换来实现.
主要成果:
- 在化 (Si3N4) 陶中实现了塑性变形.
- 在压力下连续切换连贯接口的证明.
- 成功诱导了使变形的相位转换.
结论:
- 具有连贯接口的双相结构是实现陶变形的关键.
- 通过键交换引发的压力相变提供了克服陶脆性的途径.
- 这种方法为更广泛的高性能陶应用铺平了道路.
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