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为获得高性能热结构复合材料,以国产T300碳纤维为原料,通过碳布预浸料交替铺层热压及液相浸渍裂解工艺方法制备了一系列二维碳/碳复合材料,并对二维碳/碳复合材料的微观结构特征、力学性能及烧蚀性能进行了测试与分析。研究结果表明:碳布规格及制备工艺对二维碳/碳复合材料力学性能有较大影响,当碳布规格选用八枚缎纹、经过碳化预处理且高温处理温度达到2 300℃时,二维碳/碳复合材料表现出较好的综合性能,拉伸强度和层间剪切强度的最大值分别高达301 MPa和12.4 MPa,达到了国际先进水平;在模拟典型服役环境考核状态下,制备的不同规格二维碳/碳复合材料的烧蚀性能基本相当,均未出现由于层间强度偏低而发生的烧蚀揭层现象,表现出较好的烧蚀均匀性和结构可靠性。
In order to obtain the high-performance thermal structure composite materials, a series of two-dimensional carbon / carbon composites were prepared by using domestic T300 carbon fiber as raw material through alternate lamination hot pressing and liquid immersion pyrolysis process of carbon cloth prepreg, The microstructure, mechanical properties and ablation properties of carbon / carbon composites were tested and analyzed. The results show that the carbon cloth size and preparation process have a great influence on the mechanical properties of the two-dimensional carbon / carbon composites. When the carbon cloth specifications use eight satin, after carbonization pretreatment and high temperature processing temperature reaches 2300 ℃, The carbon / carbon composites showed good comprehensive properties, the maximum values of tensile strength and interlaminar shear strength were as high as 301 MPa and 12.4 MPa, respectively, which reached the international advanced level. Under simulated state of service environment test, Of the different specifications of two-dimensional carbon / carbon composites ablative properties are basically the same, did not appear due to the low intensity of the interlayer ablation phenomenon occurs, showing good ablation uniformity and structural reliability.