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Preparation method of composite material based on hot mold pressing cracking
The invention discloses a composite material preparation method based on hot mold pressing cracking, which is characterized in that a composite material is subjected to mold pressing at medium temperature (700-1500 DEG C) and medium pressure (1-10MPa), so that on one hand, the fiber volume fraction of the composite material is increased, and on the other hand, resin is converted into an inorganic matrix in the heating cracking process, and is decomposed to generate a porous matrix; under the action of pressure, the materials are crushed and uniformly dispersed into a fiber skeleton, so that a blocky structure formed by volume shrinkage is avoided. And partial closed pores in the matrix generated by cracking can also be opened again by the pressure, so that subsequent impregnation is facilitated. The medium-high-density composite material blank can be quickly obtained in a first period by adopting a medium-temperature thermal mold pressing cracking process, the densification efficiency is high, the preparation period is greatly shortened, and the preparation cost is remarkably reduced. Compared with the existing medium-temperature and high-pressure conditions, the two key process parameters of medium temperature and medium pressure have the advantages that the requirements on equipment are greatly reduced, and the preparation and production of large-size and complex-shape engineering sample pieces are easier to realize.
本发明公开一种基于热模压裂解的复合材料制备方法，该制备方法以中温(700～1500℃)、中等压力(1～10MPa)对复合材料进行模压，一方面提高复合材料的纤维体积分数，另一方面升温裂解过程中树脂转化为无机基体，分解生成的多孔基体，在压力作用下破碎并均匀分散到纤维骨架中，避免自身体积收缩而形成块状结构。压力还能将裂解生成的基体中的部分闭孔重新打开，以利于后续浸渍。采用中温热模压裂解工艺在第一个周期内即可快速获得中高密度复合材料毛坯，致密化效率高，大大缩短了制备周期，显著降低了制备成本。中温和中等压力两个关键工艺参数与现有的中温高压条件相比，对设备的要求大大降低，且更容易实现大尺寸、复杂形状工程样件的制备和生产。
Preparation method of composite material based on hot mold pressing cracking
The invention discloses a composite material preparation method based on hot mold pressing cracking, which is characterized in that a composite material is subjected to mold pressing at medium temperature (700-1500 DEG C) and medium pressure (1-10MPa), so that on one hand, the fiber volume fraction of the composite material is increased, and on the other hand, resin is converted into an inorganic matrix in the heating cracking process, and is decomposed to generate a porous matrix; under the action of pressure, the materials are crushed and uniformly dispersed into a fiber skeleton, so that a blocky structure formed by volume shrinkage is avoided. And partial closed pores in the matrix generated by cracking can also be opened again by the pressure, so that subsequent impregnation is facilitated. The medium-high-density composite material blank can be quickly obtained in a first period by adopting a medium-temperature thermal mold pressing cracking process, the densification efficiency is high, the preparation period is greatly shortened, and the preparation cost is remarkably reduced. Compared with the existing medium-temperature and high-pressure conditions, the two key process parameters of medium temperature and medium pressure have the advantages that the requirements on equipment are greatly reduced, and the preparation and production of large-size and complex-shape engineering sample pieces are easier to realize.
本发明公开一种基于热模压裂解的复合材料制备方法，该制备方法以中温(700～1500℃)、中等压力(1～10MPa)对复合材料进行模压，一方面提高复合材料的纤维体积分数，另一方面升温裂解过程中树脂转化为无机基体，分解生成的多孔基体，在压力作用下破碎并均匀分散到纤维骨架中，避免自身体积收缩而形成块状结构。压力还能将裂解生成的基体中的部分闭孔重新打开，以利于后续浸渍。采用中温热模压裂解工艺在第一个周期内即可快速获得中高密度复合材料毛坯，致密化效率高，大大缩短了制备周期，显著降低了制备成本。中温和中等压力两个关键工艺参数与现有的中温高压条件相比，对设备的要求大大降低，且更容易实现大尺寸、复杂形状工程样件的制备和生产。
Preparation method of composite material based on hot mold pressing cracking
一种基于热模压裂解的复合材料制备方法
HU HAIFENG (author)
2022-04-12
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
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