Pressurelessly densified (Zr,Hf)B2-SiC ceramics by co-doping hafnium-boron carbides

被引：11

作者：

Yin, Jie ^{[1
,2
]}

Zhang, Buhao ^{[1
,3
]}

Liu, Xuejian ^{[1
]}

Huang, Zhengren ^{[1
]}

机构：

[1] Chinese Acad Sci, Shanghai Inst Ceram, State Key Lab High Performance Ceram & Superfine, Shanghai 200050, Peoples R China

[2] Chinese Acad Sci, Bur Major R&D Programs, Beijing 100864, Peoples R China

[3] Univ Chinese Acad Sci, Beijing 100039, Peoples R China

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2017年 / 727卷

基金：

中国国家自然科学基金;

关键词：

(Zr; Hf)B-2; Pressureless sintering; Grain refining; Grain boundary structure; Mechanical properties; MECHANICAL-PROPERTIES; MICROSTRUCTURE; DIAGRAM; HFB2;

D O I：

10.1016/j.jallcom.2017.08.092

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

(Zr,Hf)B-2-SiC ceramics were densified at 2200 degrees C without the existence of external pressure, using commercially available ZrB2, SiC, HfC and B4C powders as raw materials. HfC reacted with B4C to form HfB2 and C in-situ: the continuous solid solution formation of ZrB2-HfB2 inhibited the grain growth of matrix during high temperature effectively, and meanwhile played a critical role in enhancing densification. The mechanical properties, including flexural strength, elastic modulus, Vickers hardness and indentation toughness were tailored by compositional designing of original ZrB2-SiC-HfB2-B4C (ZSHB) recipe, which excelled its ZrB2-SiC counterpart. Novel reactive densification mechanism was discussed as well. (C) 2017 Elsevier B.V. All rights reserved.

引用

页码：706 / 710

页数：5

共 17 条

[1] Effect of HfB2 on microstructure and mechanical properties of ZrB2-SiC-based composites [J].