Oxidation resistance and strength retention behavior of fibrous monolithic ZrB2-SiC ceramic.
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| Title: | Oxidation resistance and strength retention behavior of fibrous monolithic ZrB |
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| Authors: | Han, Qingyun1 (AUTHOR), Wei, Chuncheng1 (AUTHOR) chun_cheng@sdut.edu.cn, Wang, Longfei1 (AUTHOR), Yuan, Jieyan1 (AUTHOR), Zhou, Lijuan1 (AUTHOR), Wang, Peng1,2 (AUTHOR), Dong, Shuhua1 (AUTHOR) |
| Source: | Journal of Materials Science. Jul2025, Vol. 60 Issue 25, p10255-10268. 14p. |
| Subjects: | Diffusion barriers, Surface cracks, Flexural strength, Fracture toughness, Fracture strength |
| Abstract: | In this study, fibrous monolithic precursors with uniform cell boundary were prepared by wet-spinning and co-extrusion, then the fibrous monolithic SiCw/ZrB2-SiC (FZS) and BN/ZrB2-SiC (FZN) ceramics with SiCw and BN as interface materials were compacted by hot pressing. The room temperature mechanical properties of FZS and FZN were investigated and compared. The flexural strength and fracture toughness of FZS ceramic at room temperature are 115 MPa and 3.4 MPa·m1/2, respectively, superior to FZN ceramic. The oxidation behavior and residual strength after oxidation of FZS and FZN ceramics were also compared. After 0.5 h oxidation, the strength and toughness of FZS ceramic could reach a highest value of 199 MPa and 4.06 MPa·m1/2, respectively. Meanwhile, the fracture work of FZS is 153 J/m2. It is worth noting that after 5 h of oxidation, FZS ceramic demonstrates excellent strength retention. The high strength retention of FZS after oxidation is mainly attributed to the fact that SiCw, as an interface layer, generates high viscosity SiO2 glass phase during 1500 ºC oxidation. The large amount of glass phase fills the surface cracks in FZS, and forms a dense protective diffusion barrier on the surface, hindering the further oxidation. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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