Abstract
High-entropy ceramics (HEC) with a fixed composition of (TaTiVW)C4 were prepared by spark plasma sintering (SPS) from 1600 °C to 2100 °C. Furthermore, the influence of temperature on microstructure, mechanical and tribological properties are systematically investigated. The results reveal that single-phase and dense (TaTiVW)C4 ceramics are formed at the temperature of 1700 °C. The metal elements in (TaTiVW)C4 ceramics are evenly distributed after sintering at a high temperature (2100 °C), whereas the pores are enriched with oxygen impurities. The fracture toughness of (TaTiVW)C4 ceramics, sintered at ≥1900 °C, is found to be higher than 5 MPa·m1/2, which can be ascribed to the crack deflection. (TaTiVW)C4 ceramics also exhibit excellent wear resistance with an average specific wear rate (WRs) of 2 × 10−6 mm3·N−1·m−1. The formation of tribo-oxide layer (Ta2O5, TiO2, V2O5, WO3) was conducive to the reduction of friction and wear. The relatively low synthesis temperature and excellent wear resistance make (TaTiVW)C4 a potential wear-resistant material.
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