Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
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Nanowire toughened ultrahigh-temperature anti-ablation coating and preparation method thereof
The invention relates to an ultra-high-temperature ceramic nanowire toughened ultra-high-temperature anti-ablation coating and a preparation method thereof. The anti-ablation capability of C/C can be further improved. The process method comprises the following steps: firstly, preparing a PyC inner coating on a C/C green body by utilizing an isothermal CVD (Chemical Vapor Deposition) method; a catalyst is introduced to the surface of the PyC inner coating by brushing a Ni (NO3) 2 ethanol solution, and ultrahigh-temperature ceramic HfC nanowires (hereinafter referred to as HfCnw) are grafted through catalytic chemical deposition; and the SiC/HfC composite coating is prepared by a slurry brushing method. According to the PyC/HfCnw/HfC-SiC coating provided by the invention, the ceramic coating is subjected to cross-scale toughening/reinforcement through HfCnw, and meanwhile, the complementary advantages of the HfC-SiC composite coating in the aspects of oxidation resistance and ablation resistance are fully utilized, so that the mechanical properties, oxidation resistance and thermal shock resistance of the coating are improved, and the service life of C/C in a high-temperature oxygen-containing gas flow scouring environment is prolonged.
本发明涉及一种超高温陶瓷纳米线增韧超高温抗烧蚀涂层及制备方法，可以进一步提高C/C的抗烧蚀能力。其工艺方法在于先在C/C坯体上利用等温CVD法制备PyC内涂层；通过涂刷Ni(NO3)2乙醇溶液在PyC内涂层表面引入催化剂，通过催化化学沉积接枝超高温陶瓷HfC纳米线（以下称HfCnw）；通过浆料涂刷法制备出SiC/HfC复合涂层。本发明提供的PyC/HfCnw/HfC‑SiC涂层，通过HfCnw对陶瓷涂层进行跨尺度增韧/增强，同时充分利用HfC‑SiC复合涂层在抗氧化、防烧蚀方面的互补优势，提高涂层的力学性能、抗氧化、抗热震性能，提升C/C在高温含氧气流冲刷环境下的服役寿命。
Nanowire toughened ultrahigh-temperature anti-ablation coating and preparation method thereof
The invention relates to an ultra-high-temperature ceramic nanowire toughened ultra-high-temperature anti-ablation coating and a preparation method thereof. The anti-ablation capability of C/C can be further improved. The process method comprises the following steps: firstly, preparing a PyC inner coating on a C/C green body by utilizing an isothermal CVD (Chemical Vapor Deposition) method; a catalyst is introduced to the surface of the PyC inner coating by brushing a Ni (NO3) 2 ethanol solution, and ultrahigh-temperature ceramic HfC nanowires (hereinafter referred to as HfCnw) are grafted through catalytic chemical deposition; and the SiC/HfC composite coating is prepared by a slurry brushing method. According to the PyC/HfCnw/HfC-SiC coating provided by the invention, the ceramic coating is subjected to cross-scale toughening/reinforcement through HfCnw, and meanwhile, the complementary advantages of the HfC-SiC composite coating in the aspects of oxidation resistance and ablation resistance are fully utilized, so that the mechanical properties, oxidation resistance and thermal shock resistance of the coating are improved, and the service life of C/C in a high-temperature oxygen-containing gas flow scouring environment is prolonged.
本发明涉及一种超高温陶瓷纳米线增韧超高温抗烧蚀涂层及制备方法，可以进一步提高C/C的抗烧蚀能力。其工艺方法在于先在C/C坯体上利用等温CVD法制备PyC内涂层；通过涂刷Ni(NO3)2乙醇溶液在PyC内涂层表面引入催化剂，通过催化化学沉积接枝超高温陶瓷HfC纳米线（以下称HfCnw）；通过浆料涂刷法制备出SiC/HfC复合涂层。本发明提供的PyC/HfCnw/HfC‑SiC涂层，通过HfCnw对陶瓷涂层进行跨尺度增韧/增强，同时充分利用HfC‑SiC复合涂层在抗氧化、防烧蚀方面的互补优势，提高涂层的力学性能、抗氧化、抗热震性能，提升C/C在高温含氧气流冲刷环境下的服役寿命。
Nanowire toughened ultrahigh-temperature anti-ablation coating and preparation method thereof
一种纳米线增韧超高温抗烧蚀涂层及其制备方法
LUO RUIYING (Autor:in) / LEI BUYUE (Autor:in) / HUANG PENG (Autor:in)
20.12.2024
Patent
Elektronische Ressource
Chinesisch
IPC:
C04B
Kalk
,
LIME
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