Multiple CVD densification of PAN-based carbon-fibre reinforced carbon laminates

摘要: Abstract Image analysis, to quantify the void structure, together with polarised-light microscopy were used study densification of PAN-based woven carbon-fibre reinforced carbon laminates by multiple CVD treatment. The occurred filling co-planar and bundle cracks, inter-fibre cracks pores being relatively unaffected. According its behaviour, structure in composites can be described as an array globe-domains interconnected thin capillaries. acted capillaries globes. densified a greater extent than early stages process. Initially, overall reaction was controlled chemical volume, but soon diffusion control became dominant. A barrier mass transport reactant formed at distance from external surface equal one half thickness layer cloth tended move towards proceeded.