Journal
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Volume 41, Issue 14, Pages 6943-6951Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2021.07.003
Keywords
Arc melting; HfC-HfB2-SiC composites; Hardness; Electrical conductivity; Thermal conductivity
Categories
Funding
- Ministry of Education for Pre-research of Equipment [6141A02022257]
- Science Challenge Project [TZ2016001]
- National Natural Science Foundation of China [51861145306, 51872212, 51972244]
- 111 Project [B13035, B17034]
- International Science & Technology Cooperation Program of China [2018YFE0103600, 2014DFA53090]
- Technological Innovation of Hubei Province, China [2019AAA030]
- Key-Area Research and Development Program of Guangdong Province [2019B121204001, 2020B010181001]
- Chaozhou Science and Technology Project [2019PT01]
- Self-innovation Research Funding Project of Hanjiang Laboratory [HJL202012A001, HJL202012A002, HJL202012A003]
- Major Science and Technology Project in Zhongshan City, Guangdong Province [2019AG029]
- Innovative Research Team Dvelopment Program of Ministry of Education of China [IRT_17R83]
- National Key RD Plan [2018YFC0808405]
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HfC-HfB2-SiC composites were prepared by arc melting, with a ternary eutectic composition identified and displaying a complex microstructure. The composite exhibited high hardness and fracture toughness at elevated temperatures, with varying electrical and thermal conductivity at different temperature ranges.
HfC-HfB2-SiC composites were prepared by arc melting using HfC, HfB2 and SiC powder as raw materials. The ternary eutectic composition of 16HfC-17HfB2-67SiC (mol%) was first identified, showing a complicated maze microstructure of HfC, HfB2 and SiC approximately 500 nm in thickness. The eutectic temperature of the HfCHfB2-SiC composite was nearly 2760 K. The Vickers hardness and fracture toughness of the HfC-HfB2-SiC ternary eutectic composite were 20.8 GPa and 7.7 MPa m1/2, respectively. With increasing temperature from 300 to 800 K, the electrical conductivity decreased from 8.8 x 105 to 4.3 x 105 Sm- 1, whereas the thermal conductivity increased from 28 to 32 W m-1 K-1.
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