Developing high toughness laminated HfB2-SiC ceramics with ductile Nb interlayer

被引：17

作者：

Bai, Yuhang ^{[1
]}

Sun, Mengyong ^{[1
]}

Cheng, Laifei ^{[1
]}

Fan, Shangwu ^{[1
]}

机构：

[1] Northwestern Polytech Univ, Sci & Technol Thermostruct Composite Mat Lab, Xian 710072, Shaanxi, Peoples R China

来源：

CERAMICS INTERNATIONAL | 2019年 / 45卷 / 16期

基金：

中国国家自然科学基金; 国家重点研发计划;

关键词：

HfB2-SiC ceramics; Multi-layered structure; Nb interlayer; Fracture toughness; MECHANICAL-PROPERTIES; THERMAL-SHOCK; SIC CERAMICS; NACRE-LIKE; COMPOSITES; RESISTANCE; OXIDATION; BEHAVIOR;

D O I：

10.1016/j.ceramint.2019.06.249

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Herein, laminated HfB2-SiC/Nb ceramic with multi-layered structure was synthesized via tape casting and spark plasma sintering. Despite minor loss in strength of laminated HfB2-SiC/Nb ceramics (447 +/- 12 MPa) compared with that of monolithic HfB2-SiC ceramics (470 +/- 16 MPa) following the introduction of ductile weak Nb interlayer, fracture toughness of laminated ceramics reached 14.22 +/- 0.6 MPa m(1/2), showing an improvement of similar to 129% in comparison with monolithic ceramics (6.11 +/- 0.3 MPa m(1/2)). Cooperative toughening mechanisms of crack behavior (deflection and delamination) and plastic deformation (dimples and tear ridges) led to the improvement in toughness. This research provides novel strategy for the development of heterogeneous ceramic-metal layered composites with superior fracture toughness.

引用

页码：20977 / 20982

页数：6

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