申请人:The Boeing Company
公开号:EP2703429A1
公开(公告)日:2014-03-05
In an embodiment of the disclosure, there is provided a method to reduce porosity in a composite structure. The method adds an additive to a resin material to form an additive-resin mixture. The method combines the additive-resin mixture with reinforcement fibers to form a composite prepreg material, and in turn, a composite structure. The method heat cures the composite structure in a heating apparatus under a vacuum device at the resin cure temperature, heats the composite structure to an increased temperature above the additive phase transition temperature, and maintains the increased temperature for a time period sufficient. The method reduces the increased temperature back down to the resin cure temperature to allow the additive gas to undergo a phase transition to a condense phase, resulting in a substantially reduced vacuum pressure, resulting in a reduction in a porosity of the composite structure.
在本公开的一个实施方案中,提供了一种减少复合材料结构中孔隙率的方法。该方法将添加剂添加到树脂材料中,形成添加剂-树脂混合物。该方法将添加剂-树脂混合物与增强纤维相结合,形成复合预浸料,进而形成复合结构。该方法在真空设备下的加热装置中,在树脂固化温度下对复合结构进行热固化,将复合结构加热到高于添加剂相变温度的升高温度,并在足够长的时间内保持该升高温度。该方法将升高的温度降至树脂固化温度,使添加剂气体发生相变,进入凝结相,从而使真空压力大大降低,导致复合材料结构的孔隙率降低。