通过加速湿热老化, 研究了T700/5428复合材料在100 ℃水煮条件下的吸湿老化行为, 并研究了此条件下拉伸强度和压缩强度随时间的变化规律。结果表明:复合材料吸湿率的变化在湿热处理初期符合 Fick 第二定律, T700/5428复合材料在360小时到达饱和吸湿, 饱和吸湿率为0.93%, 水分子在复合材料中的扩散系数为4.92×10-5 mm2/s, 吸湿速率为7.36×10-3 s-1;复合材料的拉伸强度和压缩强度均随着湿热处理时间的增加而出现下降, 与自然状态相比, T700/5428复合材料拉伸强度的下降幅度为5.5％, 压缩强度的下降幅度为13.7％。
The hydrothermal aging behavior on T700/5428 composites in the condition of 100 ℃ water was studied in this paper with accelerated aging method.And the variation of tensile strength and compression strength of composites was also investigated.The results indicated that the moisture absorption change of composite followed the Fick's second law at the initial stage of hydrothermal treatment.T700/5428 composites reached the saturated moisture absorption statue after 360 hours, the saturated moisture absorption was 0.93%, the diffusion coefficient of the water molecule in composites was 4.92×10-5 mm2/s and the moisture absorption rate was 7.36×10-3 s-1.The tensile strength and compression strength of composites decreased with the increase of hydrothermal treatment time.The tensile strength and compression strength of T700/5428 composites decreased by 5.5％ and 13.7％ respectively compared with that in the natural state.
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