Abstract
The changes of the void structure in PAN-based carbon-fibre-reinforced carbon laminates during densification by multiple resin impregnation/ carbonisation and two cycles of densification processes involving both CVI with xylene as precursor and resin impregnation/carbonisation have been studied by image analysis and polarised-light microscopy. On multiple resin impregnation/carbonisation, the capillary effect plays an important role so that the wider cracks are not readily filled in the early stage of the densification process. For two cycles of densification, the application of one CVI and one resin impregnation stage is more efficient in filling co-planar cracks than two CVI or two resin impregnation/carbonisation stages.
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