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Preparation method of ceramic composite coating on surface layer of light carbon-based composite material
The invention discloses a one-step forming preparation method of a light carbon-based composite material (C/CA) surface gradient ultra-high temperature ceramic (UHTC) composite coating, and belongs to the technical field of carbon-based composite material oxidation resistance. According to the invention, a silicon (Si)-silicon dioxide (SiO2) co-cementation ceramization technology is adopted, and a pre-coating layer on a C/CA substrate and a carbon matrix of a C/CA shallow surface layer can be synchronously ceramized through one-time high-temperature heat treatment process and are respectively converted into a compact UHTC-SiC outer layer and a gradient SiC inner layer (i.e., a SiC/UHTC-SiC double-layer composite coating). According to the preparation process, the double-layer coating containing the ultra-high-temperature ceramic can be obtained only through one-time heat treatment, the influence of high temperature on a carbon matrix pore structure and the crystallization degree in C/CA is remarkably reduced, and meanwhile deformation mismatching between the coating and a substrate is relieved. The outer layer of the obtained coating is a SiO2-filled compact UHTC-SiC layer, the inner layer of the obtained coating is a relatively compact gradient SiC layer, the total thickness reaches 500 microns or above, the residual stress is low, and the weight loss of C/CA under the protection of the coating is only 4% after the C/CA is oxidized at 1500 DEG C for 30 h.
本发明公开了一种轻质碳基复合材料(C/CA)表层梯度超高温陶瓷(UHTC)复合涂层的一次成型制备方法，属于碳基复合材料抗氧化技术领域。本发明采用硅(Si)‑二氧化硅(SiO2)共渗陶瓷化技术，通过一次高温热处理过程即可将C/CA基底上的预涂层与C/CA浅表层的碳基体同步陶瓷化，分别转化为致密的UHTC‑SiC外层和梯度SiC内层(即SiC/UHTC‑SiC双层复合涂层)。该制备工艺仅需一次热处理过程即可获得含有超高温陶瓷的双层涂层，显著降低了高温对C/CA中碳基体孔结构和晶化度的影响，同时缓解涂层、基底间的变形不匹配。所得涂层外层为SiO2填充致密的UHTC‑SiC层，内层为相对致密的梯度SiC层，总厚度达500μm以上，残余应力低，其防护下的C/CA在1500℃氧化30h后失重仅4％。
Preparation method of ceramic composite coating on surface layer of light carbon-based composite material
The invention discloses a one-step forming preparation method of a light carbon-based composite material (C/CA) surface gradient ultra-high temperature ceramic (UHTC) composite coating, and belongs to the technical field of carbon-based composite material oxidation resistance. According to the invention, a silicon (Si)-silicon dioxide (SiO2) co-cementation ceramization technology is adopted, and a pre-coating layer on a C/CA substrate and a carbon matrix of a C/CA shallow surface layer can be synchronously ceramized through one-time high-temperature heat treatment process and are respectively converted into a compact UHTC-SiC outer layer and a gradient SiC inner layer (i.e., a SiC/UHTC-SiC double-layer composite coating). According to the preparation process, the double-layer coating containing the ultra-high-temperature ceramic can be obtained only through one-time heat treatment, the influence of high temperature on a carbon matrix pore structure and the crystallization degree in C/CA is remarkably reduced, and meanwhile deformation mismatching between the coating and a substrate is relieved. The outer layer of the obtained coating is a SiO2-filled compact UHTC-SiC layer, the inner layer of the obtained coating is a relatively compact gradient SiC layer, the total thickness reaches 500 microns or above, the residual stress is low, and the weight loss of C/CA under the protection of the coating is only 4% after the C/CA is oxidized at 1500 DEG C for 30 h.
本发明公开了一种轻质碳基复合材料(C/CA)表层梯度超高温陶瓷(UHTC)复合涂层的一次成型制备方法，属于碳基复合材料抗氧化技术领域。本发明采用硅(Si)‑二氧化硅(SiO2)共渗陶瓷化技术，通过一次高温热处理过程即可将C/CA基底上的预涂层与C/CA浅表层的碳基体同步陶瓷化，分别转化为致密的UHTC‑SiC外层和梯度SiC内层(即SiC/UHTC‑SiC双层复合涂层)。该制备工艺仅需一次热处理过程即可获得含有超高温陶瓷的双层涂层，显著降低了高温对C/CA中碳基体孔结构和晶化度的影响，同时缓解涂层、基底间的变形不匹配。所得涂层外层为SiO2填充致密的UHTC‑SiC层，内层为相对致密的梯度SiC层，总厚度达500μm以上，残余应力低，其防护下的C/CA在1500℃氧化30h后失重仅4％。
Preparation method of ceramic composite coating on surface layer of light carbon-based composite material
轻质碳基复合材料表层陶瓷复合涂层的制备方法
HU CHENGLONG (author) / TANG SUFANG (author) / YAN MENG (author) / PANG SHENGYANG (author) / LI JIAN (author) / ZHAO RIDA (author)
2024-12-10
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
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