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SiCN precursor, deformation-controlled ceramic-based composite material and preparation method
The invention provides a SiCN precursor, a deformation-controlled ceramic-based composite material and a preparation method. Comprising the following steps: preparing a SiCN ceramic precursor; adding a volatile component, an active filler and a peroxide cross-linking agent into the SiCN precursors with different compositions to form a mixed system; the prepared precursor mixed system and carbon cloth are subjected to hot-pressing cross-linking curing molding through a film coating method; cracking the formed composite material fixed by the tool in a cracking atmosphere; the composite material is subjected to densification treatment by dipping a low-viscosity SiCN precursor and then cracking. The ceramic conversion rate is ensured, and meanwhile, the occurrence of pores, cracks and deformation in a material matrix is reduced. By adding volatile components, a gas overflow channel is formed in a matrix, thermal stress is released, pores, cracks and deformation in the material are reduced, the binding force between the ceramic matrix and carbon fibers can be enhanced through formation of cracked carbon in the ceramization process, and meanwhile, matrix shrinkage caused by component volatilization can be made up through added active filler; further, the preparation of the deformation-controlled ceramic-based composite material is realized.
本申请提供一种SiCN前驱体、控制变形的陶瓷基复合材料及制备方法。包括制备SiCN陶瓷前驱体；添加挥发性组分、活性填料及过氧化物交联剂于不同组成的SiCN前驱体中形成混合体系；制备的前驱体混合体系通过涂膜法与碳布通过热压交联固化成型；用工装固定成型的复合材料在裂解气氛中裂解；通过浸渍低粘度SiCN前驱体后裂解对复合材料进行致密化处理。在保证陶瓷转化率的同时降低了材料基体内部孔隙、裂纹及变形的发生。通过挥发性组分的加入在基体内形成气体溢出通道并释放热应力降低材料内部的孔隙、裂纹及变形，陶瓷化过程中裂解碳的形成也会增强陶瓷基体与碳纤维之间的结合力，同时加入的活性填料可以弥补由于组分挥发造成的基体收缩，进而实现控制变形的陶瓷基复合材料的制备。
SiCN precursor, deformation-controlled ceramic-based composite material and preparation method
The invention provides a SiCN precursor, a deformation-controlled ceramic-based composite material and a preparation method. Comprising the following steps: preparing a SiCN ceramic precursor; adding a volatile component, an active filler and a peroxide cross-linking agent into the SiCN precursors with different compositions to form a mixed system; the prepared precursor mixed system and carbon cloth are subjected to hot-pressing cross-linking curing molding through a film coating method; cracking the formed composite material fixed by the tool in a cracking atmosphere; the composite material is subjected to densification treatment by dipping a low-viscosity SiCN precursor and then cracking. The ceramic conversion rate is ensured, and meanwhile, the occurrence of pores, cracks and deformation in a material matrix is reduced. By adding volatile components, a gas overflow channel is formed in a matrix, thermal stress is released, pores, cracks and deformation in the material are reduced, the binding force between the ceramic matrix and carbon fibers can be enhanced through formation of cracked carbon in the ceramization process, and meanwhile, matrix shrinkage caused by component volatilization can be made up through added active filler; further, the preparation of the deformation-controlled ceramic-based composite material is realized.
本申请提供一种SiCN前驱体、控制变形的陶瓷基复合材料及制备方法。包括制备SiCN陶瓷前驱体；添加挥发性组分、活性填料及过氧化物交联剂于不同组成的SiCN前驱体中形成混合体系；制备的前驱体混合体系通过涂膜法与碳布通过热压交联固化成型；用工装固定成型的复合材料在裂解气氛中裂解；通过浸渍低粘度SiCN前驱体后裂解对复合材料进行致密化处理。在保证陶瓷转化率的同时降低了材料基体内部孔隙、裂纹及变形的发生。通过挥发性组分的加入在基体内形成气体溢出通道并释放热应力降低材料内部的孔隙、裂纹及变形，陶瓷化过程中裂解碳的形成也会增强陶瓷基体与碳纤维之间的结合力，同时加入的活性填料可以弥补由于组分挥发造成的基体收缩，进而实现控制变形的陶瓷基复合材料的制备。
SiCN precursor, deformation-controlled ceramic-based composite material and preparation method
SiCN前驱体、控制变形的陶瓷基复合材料及制备方法
LIANG YUQING (author) / CHEN XINHUA (author) / ZOU HUIHONG (author) / QIAO HONGWEI (author)
2024-11-08
Patent
Electronic Resource
Chinese
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