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Research Article | Open Access

Highly electro-conductive B4C–TiB2 composites with three-dimensional interconnected intergranular TiB2 network

Jun ZHAOa,b, Dong WANGc, Xing JINa, Xiang DINGa, Jianhua ZHUa, Songlin RANa,c,d( )
Key Laboratory of Metallurgical Emission Reduction & Resources Recycling (Anhui University of Technology), Ministry of Education, Maanshan 243002, China
School of Mechanical Engineering, Chaohu University, Hefei 238024, China
School of Materials Science and Engineering, Anhui University of Technology, Maanshan 243002, China
Jiangxi Nutpool Industrial Co., Ltd., Ji’an 331500, China
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Graphical Abstract

Abstract

To achieve lightweight B4C-based composite ceramics with high electrical conductivities and hardness, B4C–TiB2 ceramics were fabricated by reactive spark plasma sintering (SPS) using B4C, TiC, and amorphous B as raw materials. During the sintering process, fine B4C–TiB2 composite particles are firstly in situ synthesized by the reaction between TiC and B. Then, large raw B4C particles tend to grow at the cost of small B4C particles. Finally, small TiB2 grains surround large B4C grains to create a three-dimensional interconnected intergranular TiB2 network, which is beneficial for an electro-conductive network and greatly improves the conductivity of the ceramics. The effect of the B4C particle size on the mechanical and electrical properties of the ceramics was investigated. When the particle size of initial B4C powders is 10.29 µm, the obtained B4C–15 vol% TiB2 composite ceramics exhibit an electrical conductivity as high as 2.79×104 S/m and a density as low as 2.782 g/cm3, together with excellent mechanical properties including flexural strength, Vickers hardness (HV), and fracture toughness (KIC) of 676 MPa, 28.89 GPa, and 5.28 MPa·m1/2, respectively.

Keywords

B4C–TiB2reactive sintering (RS)electrical conductivitymechanical propertieselectro-conductive network

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Journal of Advanced Ceramics
Volume 12 Issue 1,
January 2023
Pages 182-195
DOI: 10.26599/JAC.2023.9220677
Cite this article:
ZHAO J, WANG D, JIN X, et al. Highly electro-conductive B4C–TiB2 composites with three-dimensional interconnected intergranular TiB2 network. Journal of Advanced Ceramics, 2023, 12(1): 182-195. https://doi.org/10.26599/JAC.2023.9220677

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Received: 02 July 2022
Revised: 11 October 2022
Accepted: 14 October 2022
Published: 07 December 2022
© The Author(s) 2022.

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