Improved damage tolerance and oxidation resistance of (Ti <sub>0.2</sub>Zr <sub>0.2</sub>Hf <sub>0.2</sub>Nb <sub>0.2</sub>Ta <sub>0.2</sub>)B <sub>2</sub>–SiC by introducing chopped carbon fibers
Feilong Huang, Hailong Wang, Cheng Fang, Mingliang Li, Gang Shao, Jinpeng Zhu, Yanchun Zhou
Abstract
High-entropy diborides (HEBs) are considered as promising high temperature structure materials owing to their high melting point and excellent thermal stability. However, the intrinsic brittleness is the main obstacle that seriously limits their practical applications. To overcome with this obstacle, carbon fibers (C<sub>f</sub>) with outstanding mechanical properties are used in the present work as a first attempt to improve the damage tolerance of HEBs. The as-prepared C<sub>f</sub>/(Ti<sub>0.2</sub>Zr<sub>0.2</sub>Hf<sub>0.2</sub>Nb<sub>0.2</sub>Ta<sub>0.2</sub>)B<sub>2</sub>–SiC composite (C<sub>f</sub>/HEB–SiC) shows a high relative density (97.9%) and good mechanical properties with flexural strength of 411±3 MPa and fracture toughness of 6.15±0.11 MPa·m<sup>1/2</sup>. More importantly, the damage tolerance parameter (<em>D<sub>t</sub></em>) has increased from 0.10 m<sup>1/2</sup> for HEB–SiC to 0.29 m<sup>1/2</sup> for C<sub>f</sub>/HEB–SiC. Through microstructural analysis and Vickers indentation of composite, the toughening mechanisms are disclosed. The carbon fibers coated with carbon coatings demonstrate a unique capacity for prolonging the crack propagation path, which promotes the reliability of composite effectively. Moreover, the C<sub>f</sub>/(Ti<sub>0.2</sub>Zr<sub>0.2</sub>Hf<sub>0.2</sub>Nb<sub>0.2</sub>Ta<sub>0.2</sub>)B<sub>2</sub>–SiC composite also exhibits good static oxidation resistance in the temperature range of 1100~1500 ℃ in air due to the formation of the protective oxide layer constituting of multicomponent oxides (Zr)HfTiO<sub>4</sub> and (Zr)Hf<sub>6</sub>Ta<sub>2</sub>O<sub>17</sub> embedded in a continuous SiO<sub>2</sub> glass. These results are promising and this primary work can be used as a reference to the synthesis of C<sub>f</sub>/HEBs for thermal protection materials under high temperature serving conditions.