Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Method for preparing ceramic-based composite material through combination of precursor impregnation cracking and reactive infiltration
The invention discloses a method for preparing a ceramic-based composite material by combining precursor impregnation and cracking with reactive infiltration. The method comprises the following steps: by taking BCl3 and NH3 as raw materials, wrapping the surface of SiCnf with a BN interface coating to obtain an ethanol dispersion liquid, mixing SiC powder, polyethylene glycol and an ethanol dispersing agent, drying, and carrying out compression molding to prepare a SiCnf/SiC biscuit; the preparation method comprises the following steps: by taking polycarbosilane as a precursor, preparing porous SiCnf/SiC ceramic by using a precursor impregnation cracking process; a carbon-filled porous ceramic biscuit is prepared by impregnating and cracking phenolic resin; and finally, densification is performed by adopting a silicon reaction infiltration process. Two processes are combined to form a bicontinuous phase of silicon carbide and silicon, so that the service temperature and the strength of the ceramic matrix composite material are improved, the defects of high porosity and low strength of the composite material prepared by a precursor impregnation and cracking process are overcome, and the density and the strength of the composite material are improved through silicon reaction infiltration.
本发明公开了前驱体浸渍裂解结合反应熔渗制备陶瓷基复合材料的方法。方法以BCl3和NH3为原料，在SiCnf表面包裹BN界面涂层并得到乙醇分散液、将SiC粉末、聚乙二醇与乙醇分散剂混合、烘干，压制成型制备SiCnf/SiC素坯；以聚碳硅烷为前驱体，用前驱体浸渍裂解工艺制备多孔SiCnf/SiC陶瓷；使用酚醛树脂浸渍裂解制备碳填充的多孔陶瓷素坯，最后采用硅反应熔渗工艺进行致密化。本发明通过两种工艺结合，形成碳化硅与硅的双连续相，提高了陶瓷基复合材料的服役温度和强度，同时避免了前驱体浸渍裂解工艺制备复合材料的孔隙率高、强度低的不足，通过硅反应熔渗提高复合材料致密度和强度。
Method for preparing ceramic-based composite material through combination of precursor impregnation cracking and reactive infiltration
The invention discloses a method for preparing a ceramic-based composite material by combining precursor impregnation and cracking with reactive infiltration. The method comprises the following steps: by taking BCl3 and NH3 as raw materials, wrapping the surface of SiCnf with a BN interface coating to obtain an ethanol dispersion liquid, mixing SiC powder, polyethylene glycol and an ethanol dispersing agent, drying, and carrying out compression molding to prepare a SiCnf/SiC biscuit; the preparation method comprises the following steps: by taking polycarbosilane as a precursor, preparing porous SiCnf/SiC ceramic by using a precursor impregnation cracking process; a carbon-filled porous ceramic biscuit is prepared by impregnating and cracking phenolic resin; and finally, densification is performed by adopting a silicon reaction infiltration process. Two processes are combined to form a bicontinuous phase of silicon carbide and silicon, so that the service temperature and the strength of the ceramic matrix composite material are improved, the defects of high porosity and low strength of the composite material prepared by a precursor impregnation and cracking process are overcome, and the density and the strength of the composite material are improved through silicon reaction infiltration.
本发明公开了前驱体浸渍裂解结合反应熔渗制备陶瓷基复合材料的方法。方法以BCl3和NH3为原料，在SiCnf表面包裹BN界面涂层并得到乙醇分散液、将SiC粉末、聚乙二醇与乙醇分散剂混合、烘干，压制成型制备SiCnf/SiC素坯；以聚碳硅烷为前驱体，用前驱体浸渍裂解工艺制备多孔SiCnf/SiC陶瓷；使用酚醛树脂浸渍裂解制备碳填充的多孔陶瓷素坯，最后采用硅反应熔渗工艺进行致密化。本发明通过两种工艺结合，形成碳化硅与硅的双连续相，提高了陶瓷基复合材料的服役温度和强度，同时避免了前驱体浸渍裂解工艺制备复合材料的孔隙率高、强度低的不足，通过硅反应熔渗提高复合材料致密度和强度。
Method for preparing ceramic-based composite material through combination of precursor impregnation cracking and reactive infiltration
前驱体浸渍裂解结合反应熔渗制备陶瓷基复合材料的方法
CHEN JIANJUN (Autor:in) / YI SHUZHENG (Autor:in) / ZHU MINGMING (Autor:in)
09.02.2024
Patent
Elektronische Ressource
Chinesisch
IPC:
C04B
Kalk
,
LIME
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