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采用碳纤维针刺整体毡作为增强体,硼酚醛树脂作为基体先驱体,用浸渍碳化的方法制备C/C复合材料。考察了在不同的浸渍压力和碳化温度下材料力学性能的差异。分析结果表明:不仅密度是影响碳/碳复合材料力学性能的重要因素,纤维和基体的结合状况以及基体碳的结构也是决定材料强度和断裂方式的重要因素。随着工艺参数的改变,碳/碳复合材料的断裂模式可以由“假塑性断裂”向“脆性断裂”转变。
Carbon fiber needled monolithic felt was used as reinforcement and boron phenolic resin as matrix precursor. C / C composites were prepared by impregnation and carbonization. The differences of mechanical properties of the materials at different impregnation pressures and carbonization temperatures were investigated. The results show that not only the density is an important factor affecting the mechanical properties of carbon / carbon composites, but also the combination of fiber and matrix and the structure of matrix carbon are also important factors that determine the strength and fracture mode of materials. As the process parameters change, the fracture mode of carbon / carbon composites can be changed from “pseudoplastic fracture ” to “brittle fracture ”.