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Meeting Materials Science & Technology 2020
Symposium Manufacturing and Processing of Advanced Ceramic Materials
Presentation Title Thermal Stability and Mechanical Properties of High-entropy Carbide Ceramics with Submicron Grain Size Fabricated by Spark Plasma Sintering
Author(s) Fei Wang, Xiang Zhang, Xueliang Yan, Yongfeng Lu, Michael Nastasi, Yan Chen, Bai Cui
On-Site Speaker (Planned) Fei Wang
Abstract Scope A two-step sintering process was used to fabricate single-phase (Hf0.2Zr0.2Ta0.2Nb0.2Ti0.2)C high-entropy carbide ceramics (HECC) with a submicron grain size during spark plasma sintering (SPS). HECC samples with grain size ranging from 400 to 600 nm and density range from 86% to 93% were fabricated. The effect of sintering temperature and time on the density, grain size, and mechanical properties of HECC were studied. The fine-grained HECC showed good mechanical properties and high thermal stability. Compared to the coarse-grain HECC with a grain size of 16.5 m, the bending strength and fracture toughness of fine-grained HECC were 25% and 20% higher, respectively. In addition, the fine-grained HECC showed small grain growth kinetics at 1300 and 1600 C.


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