Hybrid multilayer graphene and SiC whisker reinforced TiB2 based nano-composites by two-step sintering

被引：26

作者：

Sun, Jialin ^{[1
]}

Zhao, Jun ^{[2
]}

Huang, Zhifu ^{[1
]}

Yan, Ke ^{[3
]}

Jian, Yongxin ^{[1
]}

Yang, Hejie ^{[1
]}

机构：

[1] Xi An Jiao Tong Univ, Sch Mat Sci & Engn, State Key Lab Mech Behav Mat, Xian 710049, Peoples R China

[2] Shandong Univ, Sch Mech Engn, Key Lab High Efficiency & Clean Mech Manufacture, Jinan 250061, Peoples R China

[3] Xi An Jiao Tong Univ, Key Lab, Educ Minist Modern Design & Rotor Bearing Syst, Xian 710049, Peoples R China

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2021年 / 856卷

基金：

中国博士后科学基金; 中国国家自然科学基金;

关键词：

Binderless TiB2; SiC whisker; Multilayer graphene; Two-step sintering; Mechanical properties; MECHANICAL-PROPERTIES; MICROSTRUCTURE; CERAMICS; TEMPERATURE; FABRICATION; PHASE;

D O I：

10.1016/j.jallcom.2020.157283

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：

Advances in the TiB2 nano-composites reinforced with hybrid of SiC whisker (SiCw) and multilayer graphene (MLG) have been thoroughly investigated. Hybrid reinforcements, combining the advantages of SiCw as well as MLG, resulted in further enhanced mechanical properties in TiB2-based ceramic nanocomposites. Excellent mechanical properties were achieved for hybrid MLG/SiCw reinforced TiB2-TiN-MgO samples with 2.0 wt% SiCw and 0.4 wt% MLG through two-step sintering with a hardness of 21.2 GPa, a flexural strength of 1006.3 MPa and a fracture toughness of 8.8 MPa mm(1/2). Hybrid addition of MLG and SiCw performed effectively on improving the densification and inhibiting grain growth of TiB2-based ceramics. Furthermore, hybrid addition of MLG/SiCw could significantly improve the dispersion of MgO nano-particulates in TiB2 matrix. The synergistic effect of crack deflection, branching and bridging as well as MLG/SiCw pullout dramatically enhanced the toughness of TiB2-TiN-MgO ceramic nanocomposites. (C) 2020 Elsevier B.V. All rights reserved.

引用

页数：7

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