Microstructure and mechanical properties of boron carbide/graphene nanoplatelets composites fabricated by hot pressing

被引：17

作者：

Wang, Aiyang ^{[1
]}

He, Qianglong ^{[1
]}

Liu, Chun ^{[1
]}

Hu, Lanxin ^{[1
]}

Tian, Tian ^{[1
]}

Zhang, Zhixiao ^{[2
]}

Xiong, Yan ^{[3
]}

Wang, Weimin ^{[1
]}

Wang, Hao ^{[1
]}

Fu, Zhengyi ^{[1
]}

机构：

[1] Wuhan Univ Technol, State Key Lab Adv Technol Mat Synth & Proc, Wuhan 430070, Peoples R China

[2] Hebei Univ Engn, Coll Mat Sci & Engn, Handan 056038, Peoples R China

[3] Hubei Univ Technol, Sch Mat Sci & Engn, Hubei Prov Key Lab Green Mat Light Ind, Wuhan 430023, Peoples R China

来源：

CERAMICS INTERNATIONAL | 2020年 / 46卷 / 06期

基金：

中国国家自然科学基金;

关键词：

B4C-GNPs; Hot pressing; Mechanical properties; Toughening mechanisms; FRACTURE-TOUGHNESS; CARBIDE COMPOSITES; GRAPHENE SHEETS; CERAMICS; GRAPHITE; CONDUCTIVITY; STRENGTH; OXIDE;

D O I：

10.1016/j.ceramint.2019.12.007

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：

In this study, boron carbide (B4C)-graphene nanoplatelets (GNPs) composites, with enhanced strength and toughness, were fabricated by hot pressing at 1950 degrees C under a pressure of 30 MPa for 1 h. Microstructure analysis revealed that the GNPs are homogenously dispersed within the B4C matrix. Raman spectroscopy and electron microscopy showed the orientation of the GNPs in the composites. The effects of the amount of GNPs on the microstructure and mechanical properties of the composites were also investigated. The optimal mechanical properties were achieved using 1 wt% GNPs. The relative density, Vickers hardness, flexure strength, and fracture toughness of the B4C-GNPs composite ceramic were found to be 99.12%, 32.8 GPa, 508 MPa, and 4.66 MPa m(1/2) , respectively. The main toughening mechanisms included crack deflection in three dimensions, GNPs pull-out, and crack bridging. The curled and semi-wrapped GNPs encapsulated individual B4C grains to resist GNPs pull-out and to deflect propagating cracks.

引用

页码：7879 / 7887

页数：9

共 42 条

[41] Microstructures and mechanical properties of B4C-SiC intergranular/intragranular nanocomposite ceramics fabricated from B4C, Si, and graphite powders [J].