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composite material

A technology of composite materials and composite particles, applied in the direction of heterogeneous insulating materials, synthetic resin layered products, aircraft electrostatic dischargers, etc., can solve the problems of reducing the overall conductivity of composite materials and structures

Active Publication Date: 2016-10-12
CYTEC TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the dielectric properties of the resin matrix, there are specific challenges in using these materials for the primary and secondary structures of new aircraft
Although the use of carbon fibers as reinforcing fibers in composites can impart some degree of electrical conductivity along their longitudinal direction due to their graphitic nature, the dielectric properties of the matrix resin in composites can reduce the overall electrical conductivity of the composite and structure

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0109] Preparation of nickel-based conductive composite particles

[0110] In a twin-screw extruder (Sumikaexel 5003P from Sumitomo), through a melt-mixing process, filamentous nickel (Ni) flakes (525 nickel purchased from Novamant) in an amount sufficient to obtain a final concentration of 70% by weight Powder) dispersed in functionalized polyethersulfone (PES) polymer. A pure sample of the same PES polymer was used as a control. Use a high-shear screw profile that maximizes the dispersion level. The profile includes a conventional mixing section combined with a random mixing unit to create the best balance between shear and pressure in the extruder barrel. The temperature profile and process conditions used are reported in Table 1.

[0111] Table 1. Dispersion conditions of composite nickel / PES blend

[0112]

[0113] An Alpine cryogenic grinding system equipped with different rotating grinding media is used to cryogenically grind the resulting Ni / PES blend to produce micron-si...

example 2

[0115] The effect of nickel-based conductive particles on the electrical properties of composite structures

[0116] The composite nickel / PES particles of Example 1 were dispersed in Cytec Engineered Materials Ltd (UK) provided by the spraying process. 977-2-34%-194-IMS24K unidirectional tape (unidirectional carbon fiber impregnated with epoxy-based matrix) on the surface. The particle loading is 10% by volume based on the total resin volume in the strip. Laying a plurality of the strips on top of each other, and placing particles between adjacent strips to form a 1.5 mm thick quasi-isotropic test plate. The board was then cured in an autoclave at 180°C according to a 2 hour curing cycle. Mark this test board as "2A".

[0117] During the curing process, the particles are placed in the resin-rich area between adjacent carbon fiber layers that define the interlayer area. The thermoplastic component of the composite particles dissolves in the epoxy-based matrix of the strip during...

example 3

[0123] Effect of particle loading between conductive layers on the mechanical properties of composite structures

[0124] The same composite Ni / PES particles used in Example 2 with two different loadings (10% by volume and 20% by volume) were dispersed in a product from Cytec Engineering Materials, UK. 977-2-34%-194-IMS24K unidirectional strip on the surface. Two test plates with different particle loads are formed by laying down strips with particles dispersed on it. The resulting test panels are evaluated to determine the effect of composite particles on thermomechanical properties. The test plate containing 10% particles is marked as "3B" and the test plate containing 20% ​​particles is marked as "3C". For comparison purposes, a similar test plate without composite Ni / PES particles was manufactured and marked as "Reference 2".

[0125] The mechanical properties of the test board are shown in Table 3.

[0126] Table 3. Composites of inserted particles and corresponding mechanic...

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Abstract

The present invention provides a composite material comprising a layer of reinforcing fibers impregnated with a curable resin matrix and a plurality of conductive composite particles positioned adjacent or proximate to the reinforcing fibers. each of said conductive composite particles is comprised of a conductive component and a polymeric component, wherein said polymeric component comprises one or more polymers initially in a solid phase and substantially insoluble in said curable resin, However, at least a partial phase transition to a fluid phase can occur during the curing cycle of the composite material.

Description

Background technique [0001] In the aerospace industry, because a large number of primary and secondary structures in aircraft frames are made of composite materials, the use of composites has become increasingly important. The advantages of composites in aircraft design include high strength-to-weight ratio, excellent fatigue durability, corrosion resistance, and flexibility, which significantly reduces the parts and the need for fasteners and joints. However, due to the dielectric properties of the resin matrix, there are specific challenges in applying these materials to the primary and secondary structures of new aircraft. Although the use of carbon fiber as a reinforcing fiber in a composite material can transmit a certain degree of conductivity in its longitudinal direction due to its graphite properties, the dielectric properties of the matrix resin in the composite material can reduce the overall conductivity of the composite material and structure. The main structure of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29B11/16B29C70/88B32B7/02B32B27/12B29C70/02B29B9/12
CPCB29K2995/0089B29C70/882B29C70/885B29B11/16B32B27/12B29C70/025B29B2009/125B32B2307/202B32B2605/18B29B9/06B29B9/12B29B9/14B32B5/022B32B27/20B32B27/308B32B27/36B32B27/38B32B2260/023B32B2260/046B32B2262/103B32B2262/105B32B2264/105H01B3/004H01B3/427Y02T50/40C08J5/248B64C1/00B32B5/22B32B27/08C08K3/08C08K3/04C08K7/06B64D45/02B32B5/26B32B2262/106B32B2264/108B32B2305/08B32B2305/77B32B2307/212B64C2001/0072C08J2363/00C08J2481/06C08K2003/0806C08K2003/085C08K2003/0862
Inventor 卡尔梅洛·卢策·雷斯图乔埃米利亚诺·弗拉罗尼菲奥伦佐·伦齐
Owner CYTEC TECH CORP