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Prepregs with improved processing

一种预浸料、复合材料的技术，应用在预浸渍纤维领域，能够解决不能除去被截留的气体等问题

Inactive Publication Date: 2011-09-14
CYTEC TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, removal of trapped gas from prepreg in this manner is slow and may not substantially completely remove trapped gas

Method used

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  • Prepregs with improved processing
  • Prepregs with improved processing
  • Prepregs with improved processing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0071] The following examples are provided to demonstrate the advantages of the disclosed embodiments of perforated prepregs. For example, it was observed that perforated prepregs 200, 202 significantly improved gas removal from perforated prepreg layups 300, 310 compared to prepregs without perforations, without edge venting, and produced low porosity composites. Furthermore, the examples show that the rate of removal of gases 302A, 302B, 302C from within and between layers of a perforated prepreg within a layup is greater than a comparable prepreg without perforations. These examples are discussed for illustrative purposes only and should not be construed as limiting the scope of the disclosed embodiments. Example 1 - Carbon Fiber / Epoxy Composite Fabricated from Partially Impregnated Prepreg Using Vacuum Bag Only (VBO) Conditions in Oven

[0072] Three carbon fiber / epoxy composites, Trials 1, 2 and 3, were fabricated from partially impregnated prepreg encapsulated in vacuu...

Embodiment 2

[0083] Example 2 - Carbon Fiber / Epoxy Composite Fabricated from Partially Impregnated Prepreg Using Autoclave Pressure and Vacuum

[0084] Three carbon fiber / epoxy composites, trials 4, 5 and 6, were fabricated from partially impregnated prepregs using vacuum and autoclave pressure. The edge ventilation and the presence or absence of perforations were varied to examine the effect of each on the porosity of the composite. It was observed that composites made from partially impregnated perforated prepregs without edge venting using autoclave pressure exhibit significantly greater lower porosity. The porosity levels of composites made from edge-vented perforated prepregs using autoclave pressure exhibited approximately the same porosity levels as comparable composites made from edge-vented non-perforated prepregs, and essentially Smaller than non-perforated prepreg without edge venting.

[0085] Trial 4 - Non-perforated prepreg with edge venting

[0086] The weight of fiber c...

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Abstract

Systems and methods for the fabrication of prepregs possessing enhanced ability for the removal of gases from within prepregs and prepreg layups prior to and / or during at least a portion of consolidation and cure process to form composite structures are disclosed. In certain embodiments, perforations of selected configurations may be introduced into the prepregs prior to, during, and after layup. The perforations provide routes for gases trapped within and between the perforated prepregs and prepreg lay-ups to escape during consolidation and cure process, reducing the residual porosity within the resulting composite. For example, composites having residual porosities less than 10 vol. %, on the basis of the volume of the composite, may be achieved in this manner.

Description

technical field [0001] Embodiments of the present invention relate to prepreg fibers, and in particular, to methods for making perforated prepregs, perforated prepreg layups, and composite structures. Background technique [0002] Fiber reinforced composites (FRC) are hybrid structural materials comprising a matrix component surrounding at least a portion of a fiber reinforcement and arranged in one or more layers. Due to its relatively high stiffness-to-weight ratio combined with its relatively low density, FRC has been used in applications where weight is an important issue, such as aircraft components. [0003] FRC components can be manufactured using fibers pre-impregnated with matrix components, also known as prepregs. To form a composite part from prepreg, one or more layers of prepreg are assembled in a mold, and heat may be applied to flow the matrix resin, enabling consolidation of the prepreg layers. Additionally, the applied heat can also cure or polymerize the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C70/50B29C70/54C08J5/24B29C37/00B29C70/30
CPCB29C70/547B29C70/545B29C37/0064B29C70/50B29C70/30C08J2363/00C08J5/24Y10T428/24331Y10T428/24479Y10T428/24322B29C70/003C08J5/243
Inventor C·L·邦乔瓦尼J·D·博伊德
Owner CYTEC TECH CORP
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