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SiC nanowire reinforced SiC ceramic-based composite material and preparation method thereof
The invention discloses a SiC nanowire aerogel reinforced SiC ceramic-based composite material and a preparation method of the SiC nanowire aerogel reinforced SiC ceramic-based composite material. The preparation method comprises the following steps: firstly, preparing SiC nanowires by adopting a chemical vapor deposition method, then, self-assembling the SiC nanowires into SiC nanowire aerogel which is of a layered structure and is tightly crosslinked and wound by fibers by adopting a fiber freezing forming method, and depositing a pyrolytic carbon interface coating on the surfaces of the SiC nanowires through chemical vapor infiltration, so that the SiC nanowire aerogel is obtained. And finally, performing in-situ compounding on a SiC matrix in the SiC nanowire aerogel by adopting a vacuum pressure assisted precursor dipping pyrolysis method. According to the preparation method disclosed by the invention, the mechanical property of the SiC ceramic is remarkably improved by utilizing a cross-linked network structure of the SiC nanowire aerogel and micro-nano multi-stage pore distribution, and the requirements of a light-weight high-strength structural material for high-temperature equipment in the aerospace field are met.
本发明公开了一种SiC纳米线气凝胶增强SiC陶瓷基复合材料及其制备方法。本发明的制备方法包括如下步骤：首先采用化学气相沉积法制备SiC纳米线，然后采用纤维冻结成型方法将SiC纳米线自组装成层状结构、纤维紧密交联缠绕的SiC纳米线气凝胶，再通过化学气相渗透在SiC纳米线表面沉积热解碳界面涂层，最后采用真空压力辅助先驱体浸渍热解法，在SiC纳米线气凝胶中原位复合SiC基体。本发明利用SiC纳米线气凝胶的交联网络结构与微纳米多级孔隙分布显著提高SiC陶瓷力学性能，满足航空航天领域高温装备用轻质高强结构材料需求。
SiC nanowire reinforced SiC ceramic-based composite material and preparation method thereof
The invention discloses a SiC nanowire aerogel reinforced SiC ceramic-based composite material and a preparation method of the SiC nanowire aerogel reinforced SiC ceramic-based composite material. The preparation method comprises the following steps: firstly, preparing SiC nanowires by adopting a chemical vapor deposition method, then, self-assembling the SiC nanowires into SiC nanowire aerogel which is of a layered structure and is tightly crosslinked and wound by fibers by adopting a fiber freezing forming method, and depositing a pyrolytic carbon interface coating on the surfaces of the SiC nanowires through chemical vapor infiltration, so that the SiC nanowire aerogel is obtained. And finally, performing in-situ compounding on a SiC matrix in the SiC nanowire aerogel by adopting a vacuum pressure assisted precursor dipping pyrolysis method. According to the preparation method disclosed by the invention, the mechanical property of the SiC ceramic is remarkably improved by utilizing a cross-linked network structure of the SiC nanowire aerogel and micro-nano multi-stage pore distribution, and the requirements of a light-weight high-strength structural material for high-temperature equipment in the aerospace field are met.
本发明公开了一种SiC纳米线气凝胶增强SiC陶瓷基复合材料及其制备方法。本发明的制备方法包括如下步骤：首先采用化学气相沉积法制备SiC纳米线，然后采用纤维冻结成型方法将SiC纳米线自组装成层状结构、纤维紧密交联缠绕的SiC纳米线气凝胶，再通过化学气相渗透在SiC纳米线表面沉积热解碳界面涂层，最后采用真空压力辅助先驱体浸渍热解法，在SiC纳米线气凝胶中原位复合SiC基体。本发明利用SiC纳米线气凝胶的交联网络结构与微纳米多级孔隙分布显著提高SiC陶瓷力学性能，满足航空航天领域高温装备用轻质高强结构材料需求。
SiC nanowire reinforced SiC ceramic-based composite material and preparation method thereof
一种SiC纳米线增强SiC陶瓷基复合材料及其制备方法
YANG LIXIA (author) / DING YANG (author) / CHEN ZHAOFENG (author)
2022-06-03
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
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