Abstract To enhance the bonding strength and oxyacetylene ablation resistance of the ZrB 2 –ZrC coated C/C–ZrB 2 –ZrC–SiC composites obtained by the combination of supersonic atmosphere plasma spray (SAPS) and precursor infiltration and pyrolysis (PIP), novel SiC nanowire (SiCnw)/pyrolytic carbon (PyC) core-shell structures are designed and introduced into the coating. Compared to SiC nanowires which are widely added into ceramics, metals and so on, SiCnw/PyC core-shell structures have a better cohesion. Additionally, the bonding strength of coating can be largely improved through the toughening mechanism of SiCnw/PyC structures. After being exposed to oxyacetylene ablation torch, the best ZrB 2 –ZrC coated C/C–ZrB 2 –ZrC–SiC specimens with SiCnw/PyC networks possess a linear ablation rate of −0.9 ± 0.5 μm/s and a mass ablation rate of −0.3 ± 0.6 mg/s, while the linear and mass ablation rates of the C/C–ZrB 2 –ZrC–SiC specimens for comparison are up to 4.2 ± 1.0 μm/s and 1.2 ± 0.8 mg/s, respectively. The significant improvement of oxyacetylene ablation resistance is attributed to a lower surface temperature during ablation, a lower thermal stress in the coating, and a better bonding strength of the coating/substrate interface owing to the introduction of SiCnw/PyC core-shell structures.

中文翻译：

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SiCnw/PyC核壳网络提高C/C-ZrB 2 -ZrC-SiC复合材料ZrB 2 -ZrC涂层的结合强度和氧乙炔烧蚀性

摘要 为了提高通过超音速气氛等离子喷涂 (SAPS) 和前驱体渗透热解 (PIP) 组合获得的 ZrB 2 -ZrC 涂层 C/C-ZrB 2 -ZrC-SiC 复合材料的结合强度和氧乙炔烧蚀性，新的碳化硅纳米线（SiCnw）/热解碳（PyC）核壳结构被设计并引入涂层中。与广泛添加到陶瓷、金属等中的 SiC 纳米线相比，SiCnw/PyC 核壳结构具有更好的内聚力。此外，通过 SiCnw/PyC 结构的增韧机制，涂层的结合强度可以大大提高。暴露于氧乙炔烧蚀炬后，具有 SiCnw/PyC 网络的最佳 ZrB 2 -ZrC 涂层 C/C-ZrB 2 -ZrC-SiC 样品具有 -0.9 ± 0.5 μm/s 的线性烧蚀速率和质量烧蚀速率−0.3±0。6 mg/s，而用于比较的 C/C–ZrB 2 –ZrC–SiC 样品的线性和质量烧蚀速率分别高达 4.2 ± 1.0 μm/s 和 1.2 ± 0.8 mg/s。氧乙炔烧蚀性能的显着提高归因于烧蚀过程中较低的表面温度、较低的涂层热应力以及由于引入 SiCnw/PyC 核壳结构而导致的涂层/基材界面更好的结合强度。