Journal
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Volume 43, Issue 15, Pages 6732-6745Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2023.07.045
Keywords
C/C-ZrC-SiC composites; Laser ablation resistance; Laser ablation mechanism; Transformation of flexural properties
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The bending property of C/C-ZrC-SiC, C/C-SiC, and C/C composites after ablation was studied, and it was found that C/C-ZrC-SiC composites exhibited better laser ablation resistance and higher bending strength retention compared to the other two. The excellent ablation resistance and residual bending strength of C/C-ZrC-SiC composites were attributed to the lowest ablative temperature and the effective protection of ZrO2 grain and ZrO2-SiO2 layer. However, the ablation damage induced a fracture behavior transformation in the composites.
Considering practical environment, the bending property of C/C-ZrC-SiC, C/C-SiC and C/C composites after ablation was worthily studied. Results revealed that C/C-ZrC-SiC composites had a better laser ablation resistance and higher bending strength retention compared with C/C-SiC and C/C composites. The mass loss rate and ablated depth of C/C-ZrC-SiC composites was - 0.09% and 190.377 & mu;m, respectively. The retention of bending strength of C/C-ZrC-SiC composites was 217.67 & PLUSMN; 44.12 MPa, whose strength decreased by 3.57% compared with that of as-prepared C/C-ZrC-SiC composites. The excellent anti-ablation property and residual bending strength of C/C-ZrC-SiC composites were attributed to the lowest ablative temperature and the effective protection of the ZrO2 grain and ZrO2-SiO2 layer, which were formed by oxidation of ZrC-SiC, evaporation of SiO2, migration of liquid ZrO2-SiO2 and the infiltrated as well as grown ZrO2. However, the fracture behavior transformation of composites from pseudo-plastic rupture to brittle rupture was induced by the ablation damage.
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