Low density composite materials, their production and use
AssigneeHexcel Composites SASU
InventorsClaude Dauphin, Dominique Espitallier, Jimmy Grondin
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Abstract
Laminar structures comprising a fiber reinforced layer bonded to an expandable filler containing layer to provide improved flexural stiffness to weight ratio at lower fiber loading; a process for the manufacture of the laminar structures in which the material are selected so that migration of the expandable filler into the fiber structure of the fiber reinforced layer as they expand is minimised or prevented.
Claims18
A laminar structure comprising, a fibre reinforced layer containing from 10 to 40 wt % by weight of the structure of fibres bonded to a layer comprising a matrix containing from 0.1% to 10% by weight in relation to the matrix of expanded and/or expandable filler.
A laminar structure comprising a fibre reinforced layer bonded to a layer comprising an expanded filler within a cured matrix wherein the fibre reinforced layer has a thickness of from 5 mm to 50 mm and the layer comprising the expanded filler within a cured matrix has a thickness of from 4 mm to 49 mm and the laminar structure has a reduced density in comparison to the uncured laminate of from 10% to 65%, and a flexural stiffness from 10 to 100 N/mm.
Dependencies are inferred from the claim text.