硅橡胶热膨胀工艺预浸料铺层内树脂压力变化规律

采用硅橡胶热膨胀工艺制备了碳纤维/双马树脂复合材料层板, 通过自行设计的成型模具及树脂压力在线测试系统测试并分析了成型过程中热胀压力和预浸料铺层内树脂压力的变化规律, 考察了工艺间隙和温度分布的影响, 并通过显微观察分析了不同工艺条件下层板的密实状况。结果表明: 采用树脂压力在线测试系统, 可实现热膨胀工艺预浸料铺层内树脂压力的测试; 工艺间隙和硅橡胶内的温度分布对树脂压力及硅橡胶的热胀压力有重要影响, 在零吸胶工艺条件下, 当工艺间隙设计合理时, 凝胶前热胀压力和树脂压力的变化趋势及变化程度基本一致, 固化层板纤维密实并且厚度均匀; 通过增加恒温平台减小硅橡胶内部温差, 可使热胀压力的增加速度减小。 

Resin pressure variation in prepreg stack during thermal expansion process with silicone rubber

A thermal expansion process with silicone rubber was adopted to prepare carbon fiber/bismaleimide resin composite laminates. By means of a designed processing mold and a resin pressure online measuring system, the thermal expansion pressure and the resin pressure in the prepreg stack during the process were measured and analyzed. The effects of the process gap and temperature distribution were investigated, and the consolidation degrees of cured laminates under different process conditions were studied using the micrographs of laminates. The results show that the resin pressure in prepreg stack during thermal expansion process can be measured using the resin pressure online measuring system. The process gap and the temperature distribution inside the silicon rubber strongly influence the resin pressure and the thermal expansion pressure. When the process gap is reasonable, the trend and the variation degree of the thermal expansion pressure and the resin pressure before gelation are almost consistent in zero-bleeding process. The cured laminates are compact with uniform thickness. By adding the temperature platform to reduce the temperature distribution inside the silicone rubber, the increasing speed of thermal expansion pressure can be decreased.