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![Page 1: Engineered Coatings for Composites & Polymers Used in Defence & Aerospace: Now & the Future Hamburg: 10-11 February 2010 Graham Armstrong FIMF Technical.](https://reader036.fdocuments.us/reader036/viewer/2022062806/56649cc45503460f9498d5af/html5/thumbnails/1.jpg)
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Engineered Coatings for Composites & Polymers Used in Defence & Aerospace: Now & the Future
Hamburg: 10-11 February 2010
Graham Armstrong FIMFTechnical Sales Manager
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Engineered Coatings & Coatings for Engineering
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Indestructible
The Company and Our Products
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Birmingham Based SME; In Existence Since 1978Suppliers of Coatings to Aero Engine, Airframe,Aero Ancillaries and Other “High Tech”IndustriesApprovals to: AS9100; ISO9001; ISO 14001Stocking Facilities in:- UK; US; France; India; Singapore; Saudi-ArabiaRepresentation Additionally in:- Germany; Belgium; Holland; Scandinavia; Switzerland; Romania & Eastern Europe; Italy; Russia; Israel; Export to Over 40 Countries From UK Main Warehouse
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Facilities at UK Base Full Development & Quality Control Laboratories Innovative Development Team to Design New Coatings to Meet Ever Increasing Technical Requirements Full Product Manufacturing Total Commercial & Technical Back Up Teams to Support Distributors and Clients Full Product Stocking Full Export Packing & Despatch Team
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Major Customers/ApprovalsRolls RoyceTurbomecaITPGE SikorskyMeggitt ABSHAL IndiaMessier DowtyHoneywellAirbusMcDonnell Douglas Boeing
OEM & Overhaul: In House &
Pratt & Whitney (PWA/CPW)MTU Germany IAEAllied SignalEurocopter BAe SnecmaGoodrich Hamilton SundstrandAgusta-WestlandHAESL/SAESL/TAESL
their Suppliers/Contractors
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Product TypesOrganic Paints and Coatings Including ;
Epoxy ; Polyurethane; Acrylic ; Silicon ; Silicate ; Polyimides ; blends and others.Inorganic and Sacrificial Coatings ;
Diffusion and Ceramic Products Dry Film Lubricants Intumescents / ”Thermal Barriers “Primer-filler Coatings for Composites
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Typically, Coatings Must Resist:
High Heat: >500-600oCHigh Chemical Attack: Skydrol ;
de icers etcErosion: Rain & ParticleCorrosionHeat & Thermal ConductivityFuel and Lubricants
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COATINGS FOR COMPOSITESTHE CURRENT STATUS
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Initial Work
Intumescent System for Helicopter
Doors & Hatches
Coatings for Automotive Use (Motor
Cycle Fairings; Small Car
Components)
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RECENT DEVELOPMENT PROJECTS
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COMPOSITE AIRFRAMED VEHICLES
ELASTOMERIC COATINGS
INTUMESCENT & THERMAL BARRIER COATINGS
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Composite Airframed Vehicles
Fully Composite
Airframe
Composite Rotor
Blades
Resin Rich/Weak
Surfaces
Specifications
HAL DHRUV ADVANCED LIGHT HELICOPTER Low VOC 2K Epoxy
Primer-Surfacer
Low VOC 2K Epoxy
Lightweight Spray
Primer-Filler
2K Epoxy “Putty”
(Localised Use)
Low VOC 2K PU
Finishes
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Composite Airframed Vehicles
HAL DHRUV ADVANCED LIGHT HELICOPTER MPC 50015-R3 Primer-
Surfacer on Majority
of Airframe
MPC 50019-R3
Lightweight Filler on
Engine Firewall & on
Engine Exhausts
IP6 PU Finish (Matt IRR Camouflage Colours)
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Composite Airframed Vehicles
HAL DHRUV ADVANCED LIGHT HELICOPTER
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Elastomeric PU CoatingsBenefits
Erosion Resistance
Flexibility
Exterior Durability
Issues
Application
System Adhesion
Areas of Use
Engine Nose Spinners
Propeller Blades
Radome Coatings
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Elastomerics-Recent Projects
Adhesion Failures in Use
Causes felt to be:
Base Coat
Application
UV Resistance
ENGINE NOSE SPINNERS
• Investigative Work
• Clear or Pigmented Base Coat
• Supply of “User Friendly” 2 Component System
• Integration of UV Absorbers
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Epoxy BasecoatSystem PU Colour PU System
Epoxy Paint Condition Sample Ref
Bell Peel Result Pull off resultAverage SD Average SD
Clear Clear
Standard
Part Cure 4T1 UV Exposed 159.50 9.26 66.67 20.82
As received 171.50 5.00 54.00 8.94
Full Cure 4T2 UV Exposed 166.73 23.71 43.33 11.55
As received 176.67 32.93 59.00 14.32
UVStabilised
Part Cure 3T3 UV Exposed 180.00 50.19 43.33 5.77
As received 216.67 19.47 57.50 9.87
Full Cure 3T4 UV Exposed 202.43 9.12 43.33 5.77
As received 224.17 11.25 56.67 16.33
Black Clear
Standard
Part Cure 4T5 UV Exposed 191.00 14.03 66.67 14.43
As received 195.83 17.15 68.33 29.44
Full Cure 4T6 UV Exposed 156.33 13.19 70.00 17.32
As received 164.92 26.66 60.00 15.49
UVStabilised
Part Cure 3T7 UV Exposed 220.83 7.64 73.33 20.82
As received 212.50 11.83 63.00 13.96
Full Cure 3T8 UV Exposed 209.17 32.63 70.00 15.28
As received 224.58 24.26 70.00 17.89
Aluminium Clear
Standard
Part Cure 4T9 UV Exposed 178.33 12.58 67.22 14.39
As received 197.08 21.99 68.00 13.78
Full Cure 4T10 UV Exposed 158.33 2.89 68.33 16.07
As received 170.50 27.05 60.83 17.44
UVStabilised
Part Cure 3T11 UV Exposed 187.50 27.04 78.33 20.21
As received 207.08 14.27 77.50 17.25
Full Cure 3T12 UV Exposed 220.00 9.01 63.33 5.77
As received 231.67 27.55 69.17 22.45
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Elastomerics-Recent Projects
TEST CONCLUSIONS
Use of a 2K Epoxy Base Coat Solves Adhesion Issues
Clear Base Coat Better than Black/Aluminium
Use of UV Absorber Improves Both Adhesion & Clarity
System of Clear low VOC 2K Epoxy Basecoat, Plus UV Stabilised 2 Component Elastomeric Now Adopted and Written into Specification
ENGINE NOSE SPINNERS
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Elastomerics-Recent Projects
Similar Issue: Variable adhesion of System-Epoxy Base Coat + Elastomeric PU Topcoat
However before our involvement, client was sourcing various components from differing suppliers. All products met individual specs, but combination gave varying results
PROPELLER COATINGS
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Elastomerics-Recent Projects
PROPELLER COATINGS
System Developed:
Low VOC 2K Epoxy Basecoat
Low VOC 2K Elastomeric PU
Single Source Supply
Products Balanced so 100% Adhesion
Additional Benefit:
Use of low VOC products gave
>1/2 tonne reduction in VOC Emissions
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Elastomerics-Recent Projects
RADOME COATINGS
Specific Requirements:
Erosion Resistance
(Rain & Particle)
Electrical Transparency
Client Issues
Current Product Exhibits “Reversion”
Developed System:
Low VOC 2K Epoxy Seal Coat (Green Tinted)
Specially Pigmented 2K Elastomeric PU
Meets Erosion
Resistance to SAE-AMS
C-83231 & Client Electrical
Transparency
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Intumescent Coatings
Increasing Use of Composites Present
New Challenges for Fire Protection
Requirements for Both “External” &
“Cabin Interior” Systems
Each Require Differing Approaches
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Intumescent Coatings
CABIN INTERIOR SYSTEMSBoth Decorative & Functional Requirements
Main Requirements:
Technical: Non Burn Coatings
Low/No Smoke Release
(FAR 25853 Specification)
Hardness/Durability
Decorative: Colour & Finish Continuity
Textured Finish
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Intumescent Coatings
CABIN INTERIOR SYSTEMS Developed System:
Low VOC 2K Epoxy Primer-Filler (Low Weight; Thermal Barrier
Effect)
Low VOC 2K PU; Non-Burn, low Smoke Emission
Nano Modified for Surface Hardness
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Intumescent Coatings
CONTROL BOXES-RECORDERS Traditionally Metal Construction
Moving to Carbon Fibre Epoxy Composite
(Weight etc)
Within Airframe But Usually Outside Passenger
Environment
Requirement to Protect From Fire for Minimum 5
minutes
Requirement to Keep Interior Components Below
350oC (662oF)
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Intumescent Coatings
CONTROL BOXES-RECORDERS Project with Prime Airframe Manufacturer
Three Alternative Systems Evaluated:
Substrate: Cycom 5215 T650 6K-135 5HS Prepreg
Seal Coat: Low VOC 2K Epoxy Sealer (Green Tinted)
Intumescent: 1.) IP 1265 Thermal Intumescent
2.) Combination IP1265/IP9189
3.) IP 9189 Full Intumescent
Top Coat: Low VOC 2K Epoxy Low Flame Spread Finish
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Intumescent Coatings
CONTROL BOXES-RECORDERS Coating Systems
Clean Composite with Isopropanol
Apply Green Tinted Seal Coat to Nominal 20 microns
Apply Multi Coat Intumescent to Nominal 350 microns
Apply Finish Coat to Nominal 30 microns
All Coats Cured at 80oC (176oF)
All Panels Allowed 7 days Stabilisation Before Burn Test
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Intumescent Coatings
CONTROL BOXES-RECORDERSTest Procedure
(to follow set up in BSX 37)
Heat Source: Rothenburger Superfire 2 Torch
Flame Temperature: 1060oC (1940oF)
Flame Applied Directly to Coated Side of Test Panel for 2/5 Minutes
Thermocouples Mounted at Flame/Panel Interface and on Reverse of Panel behind Burner
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Intumescent CoatingsCONTROL BOXES/RECORDERS
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Intumescent Coatings
CONTROL BOXES-RECORDERSIntumescence Values
System 1 System 2 System 3
2 Min 5Min 2 Min 5Min 2 Min 5Min
Height of Char (mm) 9.46 9.95 9.52 9.55 12.28 11.38
Original FT (µm) 350 350 334 334 333 333
Degree of Intumescence (Ratio)
26.00 27.40 27.50 27.60 35.90 33.20
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Front View System 1 System 2 System 3
2 Minute Burn
5 Minute Burn
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Side View System 1 System 2 System 3
2 Minute Burn
5 Minute Burn
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Intumescent Coatings
CONTROL BOXES-RECORDERSReport/Comments
All Three Systems Met Original
Requirements
IP 1265 Thermal Intumescent Gave Off
Slightly More Smoke
IP 9189 Selected For Use
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IN MOULD PRIMER APPLICATION
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In Mould Primers Originally Researched in
Conjunction with Major Automotive
Manufacturer
Being Investigated With Primes in
Aerospace
Has been found to be Successful
with both Injection Systems and
Pre-Preg Layup.
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In Mould Primers Product:
Fast Set Up Low VOC 2K Epoxy Surfacer
Process
Apply Epoxy Compatible Mould Release
Spray Apply Primer to Mould Surface
Cure Primer; Either Force Cure or Air Dry
Lay Up Pre-Preg or Fibre Blankets/Inject
Cure as per Normal Process (Autoclave)
Break Mould
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In Mould Primers Benefits
Very Even Pre-Primed Surface (Primer
Surface Mirrors the Surface of the Mould)
No Resin Weak Surface Areas
No/Minimal Additional Hand Filling
Faster/Simpler Finishing Process
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EXCITING NEW DEVELOPMENTS
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Electrical Conductive Coatings
UK KTN (Institute
of Materials)
Possible FP 7
project
Use of Piezo
Electric Cells for
Aircraft De-Icing
Possible Use of
Nano Materials
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Bruisable Coatings Damage to
Composite not
always visible
(different to metal)
Danger of
structural
weakening not
being apparent
Investigation into
“Bruisable”
Coatings
Possible Use of
Nano to Act as
“Indicator”
Very Early Stage of
Development -
Watch this space!
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Increased Hardness & Resistance Properties
Requirement for
Improvements in:
Surface Hardness/
Erosion Resistance
Heat Resistance/
Intumescence/Thermal Barrier
Chemical Resistance
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Increased Hardness & Resistance Properties
Alternative Solutions:
Alternative Cure
Methods on Heat
Sensitive Substrates
Formulation of Cold/
Low Temp Cure
Products With
Increased Performance
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Environmental/Legislative Issues
REACH
SVHC’s
Ongoing Restrictions
Solvents Directive
HAPS
CLP
GHS
CrVI Elimination
CRIII Elimination
VOC Reduction/
Elimination
Example: Propeller Manufacturer Discussed Earlier:
VOC Reduction of
>1/2 Tonne
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For more information please contact our technical department
+44 (0)121 702 2485
Outside UK office hours please use the form at: -
www.indestructible.co.uk/form