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C/C-ZrC composites with continuous ZrC matrix were prepared by precursor infiltration and pyrolysis process using zirconium-containing polymer.Ablation properties of the composites were investigated by oxyacetylene flame with heat flux of 2380 and 4180 kW/m~2,respectively.The results showed that C/C-ZrC composites exhibited excellent ablation resistance under the heat flux of 2380 kW/m~2 for 120 s and a tree-coral-like ZrO_2protective layer formed after ablation.However,when the heat flux increased to 4180 kW/m~2,the maximum temperature of ablated surface reached 2500 ℃ and a strong degradation of ablation resistance was observed due to the weak bonding between the formed ZrO_2 layer and the composites.The flexural strength of C/C-ZrC composites was 110.7 ± 7.5 MPa.There were a large number of carbon fiber bundles pull-out,and the composites exhibited a pseudo-plastic fracture behavior.
C / C-ZrC composites with continuous ZrC matrix were prepared by precursor infiltration and pyrolysis process using zirconium-containing polymer. Ablation properties of the composites were investigated by oxyacetylene flame with heat flux of 2380 and 4180 kW / m ~ 2, respectively. Results showed that C / C-ZrC composites exhibited excellent ablation resistance under the heat flux of 2380 kW / m 2 for 120 s and a tree-coral-like ZrO 2 protective layer formed after ablation. Of the when the heat flux increased to 4180 kW / m ~ 2, the maximum temperature of ablated surface reached 2500 ° C and a strong degradation of ablation resistance was observed due to weak bonding between the formed ZrO_2 layer and the composites. flexural strength of C / C-ZrC composites was 110.7 ± 7.5 MPa. There was a large number of carbon fiber bundles pull-out, and the composites exhibited a pseudo-plastic fracture behavior.