One-step preparation and ablation behavior of ZrC-SiC-Si coating for nose-shaped ZrC/C composites with gradient pore structure by vapor silicon infiltration
Source abstract
Abstract
To improve the ablation resistance of the nose-shaped ZrC/C composites with gradient pore structure (ZrC/C GS ), a ZrC-SiC-Si coating was prepared by one-step vapor silicon infiltration. The bonding strength between the ZrC-SiC-Si coating and the ZrC/C GS composite was 21.2 MPa. The hardness and elastic modulus of the ZrC-SiC-Si coating were 1650.5 ± 30.5 HV and 176.7 ± 3.2 GPa. As the temperature increased from 200 to 1500 ℃, the CTE of the ZrC-SiC-Si coated ZrC/C GS composites increased from 4.9 × 10 −6 K −1 to 6.18 × 10 −6 K −1 . After ablation for 40 s using oxyacetylene torch with a heat flux 2.4 MW/m 2 , the linear ablation rate of the ZrC-SiC-Si coated ZrC/C GS composites decreased by 54.8% compared with that of the ZrC/C GS composites, and it could be maintained at 97.4% of the original heat resistance capacity. The finite element simulation results showed that the residual thermal stresses at the coating/matrix interface were in the range of 10.7–20.2 MPa. After ablation for 40 × 3 s, the ZrC-SiC-Si coating failed.
Source: expertdata · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Advanced ceramic materials synthesis · Advanced materials and composites · MXene and MAX Phase Materials
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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