Graphene platelets enhanced pressureless- sintered B4C ceramics

Dezhi Gao; Jie Jing; Jincheng Yu; Xue Guo; Yubai Zhang; Hongyu Gong; Yujun Zhang

doi:10.1098/rsos.171837

Graphene platelets enhanced pressureless- sintered B₄C ceramics

R Soc Open Sci. 2018 Apr 11;5(4):171837. doi: 10.1098/rsos.171837. eCollection 2018 Apr.

Authors

Dezhi Gao^{1

2}, Jie Jing^{1

2}, Jincheng Yu^{1

2}, Xue Guo^{1

2}, Yubai Zhang^{1

2}, Hongyu Gong^{1

2}, Yujun Zhang^{1

2

3}

Affiliations

¹ Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials of Ministry of Education, Shandong University, Jinan 250061, People's Republic of China.
² Key Laboratory of Special Functional Aggregated Materials, Ministry of Education, Shandong University, Jinan 250061, People's Republic of China.
³ Laiwu Yasai Ceramics Technology Co. Ltd. Laiwu 271100, People's Republic of China.

Abstract

B₄C ceramics with different contents of graphene platelets (GPL) were synthesized by a pressureless process in Ar atmosphere. The influences of GPL on mechanical properties, thermal conductivity and electrical resistivity of the B₄C ceramics were investigated. Mechanical properties ran up to optimal condition with hardness of 29.1 GPa, bending strength of 383.9 GPa and fracture toughness of 5.72 MPa m^1/2 with 0.8 wt% GPL separately. Thermal conductivity and electrical resistivity reached extreme values of 26.35 W m^-1 k^-1 and 0.1 Ω cm^-1. Performances of the ceramics were mainly affected by the generation of non-functional-GPL and the result indicated that a large amount of non-functional-GPL could contribute to poorer overall performance. Meanwhile, two particular pullout mechanisms concerning toughness enhancing was discussed in detail.

Keywords: B4C ceramic; graphene platelets; mechanical; pressureless-sintered.