4.5 Article

W/Si3N4 composite ceramics reinforced with core-shell W-crystallized oxynitride phase

出版社

WILEY
DOI: 10.1111/ijac.14556

关键词

flexural strength; fracture toughness; interface structure; silicon nitride

向作者/读者索取更多资源

The introduction of a reinforced phase is an effective way to toughen silicon nitride ceramics. However, the residual stress caused by thermal expansion mismatch may generate interfacial defects and deteriorate the strength. A novel strategy for optimizing interface structure has been proposed to reinforce W/Si3N4 composite ceramics. By introducing (Y2O3, Al2O3, W) particles, a core-shell structural W-crystallized oxynitride phase is in situ-generated, inhibiting interfacial defects and improving the flexural strength and fracture toughness of the ceramics.
The introduction of a reinforced phase is an effective way to toughen silicon nitride ceramics. However, the residual stress caused by thermal expansion mismatch between the reinforced phase and Si3N4 ceramics may generate interfacial defects and deteriorate the strength of silicon nitride ceramics. Therefore, a novel strategy for optimizing interface structure to reinforceW/Si3N4 composite ceramics has been proposed. After introducing (Y2O3, Al2O3, W) particles in the W/Si3N4 ceramics, the melted liquid phase encompasses the W particles at high temperature and in situ-generates the core-shell structural W-crystallized oxynitride phase as the material cools. As a result, the interfacial defect was inhibited after the core-shell W-crystallized oxynitride phase was introduced. With the increase of W addition from 0 to 4 wt%, the flexural strength of the W/Si3N4 ceramics with introducing core-shell structural W-crystallized oxynitride phase increases from 985 to 1168 MPa, and the fracture toughness improves from 6.5 to 9.0 MPa m(1/2).

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.5
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据