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Preparation method of carbon/carbon composite material with SiC-HfB2-Si single-layer composite coating
The invention relates to a preparation method of a carbon/carbon composite material with a SiC-HfB2-Si single-layer composite coating, which comprises the following steps: preparing a resin carbon -SiC-HfO2-B4C-Si porous pre-coating on the carbon/carbon surface by a slurry impregnation method, and carrying out vapor-phase siliconizing and reaction on vapor-phase silicon and a carbon/carbon matrixto generate a SiC transition layer, thereby being beneficial to enhancing the binding force between the coating and the matrix. HfO2, B4C and resin carbon are subjected to an in-situ reaction to generate HfB2 through high-temperature sintering, so that the problem of non-uniform particle distribution caused by poor sinterability of directly added HfB2 is favorably avoided. Silicon has good fluidity in a high-temperature environment, and finally the overall compactness of the coating can be synergistically improved. SiC, HfB2 and Si form a multiphase mosaic interface in the coating, and HfB2 ispinned in the composite coating, so that crack deflection in the coating can be induced, and crack tip stress can be relieved. The SiC-HfB2-Si composite antioxidant coating prepared by the inventionhas a novel transition layer and a compact mosaic structure, is well combined with a matrix, and has excellent long-term oxidation resistance and thermal shock resistance.
本发明涉及一种具有SiC‑HfB2‑Si单层复合涂层的碳/碳复合材料的制备方法，采用料浆浸渍法在碳/碳表面制备树脂碳‑SiC‑HfO2‑B4C‑Si多孔预涂层，随后气相渗硅，气相硅与碳/碳基体反应生成SiC过渡层，有利于提高涂层与基体的结合力。高温烧结使HfO2、B4C与树脂碳发生原位反应生成HfB2，有利于规避直接添加HfB2因其本身烧结性差引起的的颗粒分布不均问题。硅在高温环境下具有良好流动性，最终可协同提高涂层的整体致密性。SiC、HfB2和Si在涂层中形成多相镶嵌界面，HfB2钉扎在复合涂层中，可诱导涂层中裂纹偏转，还可缓解裂纹尖端应力。本发明所制备的SiC‑HfB2‑Si复合抗氧化涂层具有一种新颖的过渡层及致密的镶嵌结构，与基体结合良好，具有优异的长时抗氧化及抗热震性能。
Preparation method of carbon/carbon composite material with SiC-HfB2-Si single-layer composite coating
The invention relates to a preparation method of a carbon/carbon composite material with a SiC-HfB2-Si single-layer composite coating, which comprises the following steps: preparing a resin carbon -SiC-HfO2-B4C-Si porous pre-coating on the carbon/carbon surface by a slurry impregnation method, and carrying out vapor-phase siliconizing and reaction on vapor-phase silicon and a carbon/carbon matrixto generate a SiC transition layer, thereby being beneficial to enhancing the binding force between the coating and the matrix. HfO2, B4C and resin carbon are subjected to an in-situ reaction to generate HfB2 through high-temperature sintering, so that the problem of non-uniform particle distribution caused by poor sinterability of directly added HfB2 is favorably avoided. Silicon has good fluidity in a high-temperature environment, and finally the overall compactness of the coating can be synergistically improved. SiC, HfB2 and Si form a multiphase mosaic interface in the coating, and HfB2 ispinned in the composite coating, so that crack deflection in the coating can be induced, and crack tip stress can be relieved. The SiC-HfB2-Si composite antioxidant coating prepared by the inventionhas a novel transition layer and a compact mosaic structure, is well combined with a matrix, and has excellent long-term oxidation resistance and thermal shock resistance.
本发明涉及一种具有SiC‑HfB2‑Si单层复合涂层的碳/碳复合材料的制备方法，采用料浆浸渍法在碳/碳表面制备树脂碳‑SiC‑HfO2‑B4C‑Si多孔预涂层，随后气相渗硅，气相硅与碳/碳基体反应生成SiC过渡层，有利于提高涂层与基体的结合力。高温烧结使HfO2、B4C与树脂碳发生原位反应生成HfB2，有利于规避直接添加HfB2因其本身烧结性差引起的的颗粒分布不均问题。硅在高温环境下具有良好流动性，最终可协同提高涂层的整体致密性。SiC、HfB2和Si在涂层中形成多相镶嵌界面，HfB2钉扎在复合涂层中，可诱导涂层中裂纹偏转，还可缓解裂纹尖端应力。本发明所制备的SiC‑HfB2‑Si复合抗氧化涂层具有一种新颖的过渡层及致密的镶嵌结构，与基体结合良好，具有优异的长时抗氧化及抗热震性能。
Preparation method of carbon/carbon composite material with SiC-HfB2-Si single-layer composite coating
一种具有SiC-HfB2-Si单层复合涂层的碳/碳复合材料的制备方法
FU QIANGANG (Autor:in) / ZHANG PEI (Autor:in) / LI HEJUN (Autor:in) / ZHU XIAOFEI (Autor:in) / ZHOU LEI (Autor:in) / CHENG CHUNYU (Autor:in) / WEI YALONG (Autor:in) / ZHANG GUANGPENG (Autor:in)
26.02.2021
Patent
Elektronische Ressource
Chinesisch
IPC:
C04B
Kalk
,
LIME
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