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Electrically conductive materials for heating and deicing airfoils

A technology of conductive material and conductive material layer, applied in conductive materials, conductive materials, de-icing devices, etc., can solve the problems of loss tolerance, inability to dissipate charge accumulation, not ideal, etc.

Active Publication Date: 2018-03-13
THE BOEING CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition to being unable to dissipate charge buildup, traditional coatings may not have other desirable "airworthy" properties
For example, performance with respect to durability parameters such as rain erosion, UV resistance, high temperature resistance, low temperature resistance, insufficient flexibility, and resistance to sand and hail damage is critical for conventional surface coatings on surfaces of vehicles such as aircraft exposed to harsh conditions. may not be ideal for

Method used

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  • Electrically conductive materials for heating and deicing airfoils
  • Electrically conductive materials for heating and deicing airfoils
  • Electrically conductive materials for heating and deicing airfoils

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0122] Embodiment 1: PANI:DNNSA arranged on the rotor blade: Polyaniline DNNSA in xylene was applied to the outer surface of the rotor blade and dried using a heat gun. The coated surface was rinsed with isopropanol to promote increased conductivity of the film. Silver ink was applied on opposite edges of the coating for electrical connections. Copper tape was applied to the silver contacts to provide connection to AC power using alligator clips. The resistance across the membrane was initially measured at 340 ohms, however after application of 100V AC the resistance jumped to 10K ohms. The measured values ​​are shown in Table 2.

[0123] Table 2 PANI-DNNSA

[0124] Voltage regulating transformer setting

Embodiment 2

[0125] Embodiment 2: PEDOT:PSS arranged on the rotor blade: Seven coats of the PEDOT:PSS formulation were applied by brush to the exterior of the rotor blade and dried with a heat gun between coats. Silver ink was applied to the opposite edge of the coating for the power connection, and copper tape was used as a contact for the silver to make the power connection. The resistance across the membrane was initially measured at 23.5 ohms. The measured values ​​are shown in Table 3.

[0126] Table 3 PEDOT:PSS

[0127] Voltage regulating transformer setting

Voltage, AC(60Hz)

Current (A)

Power (W)

10

15.11

.22

3.32

20

29.67

.47

13.94

30

44

.48

21.12

40

57.6

.60

34.56

30

44

.41

18.04

20

29.67

.26

7.71

10

15.11

.13

1.96

30

44

.41

18.04

[0128] Remove the copper tape from the silver contacts and utilize the alligator clips to make a direc...

Embodiment 3

[0132] Embodiment 3: PANI:DNNSA+carbon nanotube sheet: Carbon nanotube sheets were obtained from General Nano Corp., product IDGN-N8-LD10. Polyaniline dinonylnaphthalenesulfonic acid (PANI-DNNSA) was synthesized as described above. Silver ink (AG530) was obtained from Conductive Compounds Corp. and used for electrical connections. 8663HS polyurethane protective tape was obtained from 3M Company.

[0133] Resistance measurement: Using a micropipette, a 2.5 cm x 2.5 cm square sheet of carbon nanotubes was coated with 0.5 ml of PANI-DNNSA solution, carefully covering the area. The polymer solution provides a uniform coating. Silver ink is applied to opposite ends of the sheet for power connections. The coated sheets were dried in air at 60°C in a convection oven. The electrical resistance of the sheet was calculated using the current-voltage curve generated by the Keithley 4200-SCS system.

[0134] Electric heating: A 21 cm x 7.5 cm sheet of carbon nanotubes was placed on ...

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Abstract

Composite airfoils of the present disclosure comprise a root section including a first surface. The airfoils comprise an intermediate section having a first surface and coupled with the root section at a first end. The airfoils comprise a tip section having a first surface and coupled at a first end with a second end of the intermediate section. The airfoils comprise a conductive material layer adjacent at least one of the first surface of the root section, the first surface of the intermediate section, and the first surface of the tip section. The conductive material comprises a first polymer, a second polymer, and a sulfonic acid.

Description

technical field [0001] Aspects of the present disclosure include airfoils having conductive materials, methods of manufacture and applications thereof. Background technique [0002] Cold weather conditions promote ice buildup on vehicle surfaces. To de-ice, large quantities of chemicals are usually sprayed onto the ice to promote melting. Additionally or alternatively, electrically heating the surface of the vehicle to melt the ice involves significant energy consumption to facilitate adequate deicing. Extensive chemical and / or energy consumption is a cost burden for the vehicle user. [0003] Deicing is particularly challenging for the airfoils (eg, rotor blades) of rotorcraft such as helicopters. Existing deicing concepts applicable to rotorcraft involve electrothermal ice protection systems. The system remains the only FAA- and DoD-approved rotor blade-implementing system. [0004] The system includes a heater mounted on the leading edge of the blade. These deicing ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/12B64D15/12
CPCB64D15/12H01B1/124H01B1/127H01B1/128H01B1/122H05B3/146H05B3/145H05B2203/037H05B2214/02H05B2214/04Y02E10/72B64C27/46
Inventor P·J·金伦K·W·扬
Owner THE BOEING CO