Electrically Conductive Composite Material

a composite material and electrically conductive technology, applied in the direction of non-conductive materials with dispersed conductive materials, synthetic resin layered products, fault locations, etc., can solve the problems of wire core failure, and detection of damage to the outer conductive layer

Inactive Publication Date: 2011-09-01
NASA
View PDF34 Cites 30 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0005]The wires are linked to an electrical signal generator that delivers an electrical signal (a voltage or current) to the conductive outer detection layer. A detector circuit detects and measures characteristics of the electrical signals in the outer detection layer to detect damage to the outer detection layer. In this way, damage to the wire, including potentially early damage to the insulation layer or damage to the wire core, is detected. If the damage happens gradually, damage to the outer conductive layer can be detected before the wire core fails or in some cases even is damaged. New methods of detecting damage to an electrical wire or other materials are also provided.

Problems solved by technology

In this way, damage to the wire, including potentially early damage to the insulation layer or damage to the wire core, is detected.
If the damage happens gradually, damage to the outer conductive layer can be detected before the wire core fails or in some cases even is damaged.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Electrically Conductive Composite Material
  • Electrically Conductive Composite Material
  • Electrically Conductive Composite Material

Examples

Experimental program
Comparison scheme
Effect test

example 1

Nickel-Coated Carbon Fiber Cloth

[0144]We found that in order to detect damage to the conductive layer 21, an electrical resistance of approximately 50 ohms was required over whatever distance was being monitored. An inherently conductive polyaniline was obtained with a resistance of 49 ohms per foot. But this was found difficult to reproduce for deposition onto a wire insulation layer.

[0145]Nickel-coated (nickelized) carbon cloths were obtained from Conductive Composites Company (Midway, Utah) and evaluated for detection layer applications.

[0146]Table 1 lists the conductivity measurements and amounts of nickel coating on the cloths. The carbon cloth squares were 5×5 inches, and conductivity was measured across the length of a square, over 5 inches. The uncoated cloth had a mass of 0.13 g.

TABLE 1Conductivity Measurements for Nickel-Coated Carbon Cloth.Milligrams of nickel coating per sheetConductivity (Ω / square)09101.5110.8350.2430.15

Polymer Coating of Nickelized Carbon Cloth.

[0147]S...

example 2

Nickel-Coated Carbon Fibers

[0150]Nickel-coated carbon fibers were obtained from various commercial vendors. These contain nickel coated onto a ribbon of carbon fibers via chemical vapor deposition (CVD). The fibers contained 2-63% nickel by weight. TGA showed that the nickel-coated fibers were stable to over 300° C. A 250-foot wire construct was prepared using 40%, 62%, and 63% nickel carbon (NiN—C) fibers. Strands of these fibers were wrapped around the inner insulation material of the wire using a tape wrap machine with 0, 25, 33, 50, and / or 66% ribbon overlap. One of two methods were employed to manufacture the outer insulation: (1) tape insulation material, i.e. Teflon, was wrapped over the NiN—C fibers and sintered at temperatures above 900° F. or (2) FEP insulation material was extruded over the NiN—C fibers using a horizontal single screw extruder. TGA analysis showed the nickel-coated fibers were stable to over 900° C. Using TDR, damage to the detection layer was detectable ...

example 3

Conductive Metal Tapes

[0151]Conductive metal tapes were wrapped at 0, 25, and 50% overlap onto the inner insulation layer of a standard wire type using a tape winding machine. One of two methods were employed to manufacture the outer insulation: (1) tape insulation material, i.e. Teflon, was wrapped over the metallic tape and sintered at temperatures above 900° F. or (2) FEP insulation was extruded over the metal tape using a horizontal single screw extruder. Tapes of copper or aluminum 3 mil thick were favorable based on their flexibility and conductivity. Improving draw tension of the tapes during wrapping eliminated the need for an adhesive layer.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
thicknessaaaaaaaaaa
thickaaaaaaaaaa
thickaaaaaaaaaa
Login to view more

Abstract

A composite material formed of electrically conductive metalized carbon fibers, a thin metal coating or a composite material formed of a conductive polymer and metal nanoparticles.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is related to co-pending applications referenced as KSC-12866 entitled “In-Situ Wire Damage Detection System” and KSC-13285 entitled “A Method of Fault Detection and Rerouting” filed concurrently, and claims the benefit under 35 U.S.C. §119(e) of U.S. Provisional Application Ser. No. 61 / 308,664 filed on Feb. 26, 2010, the contents of which are incorporated herein by reference.BACKGROUND OF THE INVENTION[0002]Faults in electrical wiring are a serious concern, especially for the aerospace and aeronautical industries. There are a number of airplane and spacecraft accidents that have occurred as a result of faulty wiring creating shorts or opens, resulting in loss of control of the aircraft or in arcing leading to fires and explosions. TWA flight 800 is one example where an electrical wire failure resulted in the loss of many lives. Wire and cable testing is usually performed on the ground after the crew reports an anomaly en...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(United States)
IPC IPC(8): H01B7/18H01B3/30H01B1/24B32B7/12H01B1/22
CPCY10T428/2852H01B1/22H01B1/04H01B7/328G01R31/085H01B1/24G01R31/021G01R31/008H01B3/306G01R31/58
Inventor WILLIAMS, MARTHA K.ROBERSON, LUKE B.TATE, LANETRA C.SMITH, TRENT M.GIBSON, TRACY L.JOLLEY, SCOTT T.
Owner NASA
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap