smart materials for seals with additional function
TRANSCRIPT
Smart Materials for Seals with Additional Function
Rubber in Automotive ConferenceDr. Boris TraberJune 13-14, 2017 Troy
Content
Smart Materials, Condition Monitoring and Industry 4.0/ Internet of Things
Material Portfolio
Proof of concept for potential applications
Content
Smart Materials, Condition Monitoring and Industry 4.0/Internet ofThings
Material Portfolio
Proof of concept for potential applications
Technology OverviewProducts with additional function
Products withadditional function
ProductData Storage
Products withintegrated sensors
Products withintelligent materials
Products withsensors
Products withactuators
MaterialsSmart Materials
PiezoelectricMechanical stress produces Voltage and vice versa
ElectrostrictiveMagnetostrictiveElastic deformation in an electric or magnetic field
Shape MemoryAbility to return to the original shape from a deformed state due to stress or temperature
Self HealingStructurally incorporated ability to repair damage caused by mechanical usage over time
MagnetorheologicalFluids which become solid when placed in a magnetic field
ChromogenicColor change in response to electrical, optical or thermal changes
Smart materials sense changes in the environment around them and respond in a predictable and reversible manner
ElectrostrictiveMagnetostrictiveElastic deformation in an electric or magnetic field
Value for the customer
Sealing products with additional function in
itself are more costly products since they would
need either a further production step or high price
materials.
For the sucess of the additional function
concept it is crucial to analyze together with the
customer because this technology enables savings
in a holistic production approach
Maintenance Management Strategy
Cause: assembling error Cause: bad fluid compatibility Cause:long-term wear Operating time
Initial start-upphase
Usage phase Fatigue phase
Maintenance timing: Too early Optimum
Too late
Failu
rera
te
Preventive Predictive Reactive
In automotive applications: On board-diagnosis
Content
Smart Materials, Condition Monitoring and Industry 4.0 / Internet of things
Material Portfolio Proof of concept for potential applications
Magnetic Elastomers
Permanent magnetic
Soft magnetic
Electrical conductive Elastomers
Highly conductive (< 1000 Ω)
Antistatic (> 1000 Ω)
Foamed variants
DielectricElastomers
Sandwich structure
Conductive coating (> 1000 Ω)
In development:Thermal conductive
elastomers
MaterialsSmart Materials
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Unit Basic Material70 NBR 285784
Magnetic Switchable Elastomer85 NBR 286102
New SST SWT Aging
Shore A hardness HE 69 88 84 84 86
Micro hardness IRHD HE 68 82 82 81 87
Tensile strength at 100% elongation N/mm² 5,2 5,3 5,2 5,3 6,6
Tensile strength at break N/mm² 12,5 5,4 5,3 5,4 6,7
Elongation at break % 257 139 144 144 111
Compression set25%, 24h, 100°C % 7,6 12 12 13
Tg (DSC) °C -55 -54 -54 -54
Magnetic Switchable ElastomerNBR Compound
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Condensation water test (SWT) 72h, 40°C, 100% humiditySalt water spray test acc. ISO 9227 (SST) 72h, 35°C, atomized spray of 5% NaCl-solution Improving from one development step to the next clearly visible Final Compound fulfills the specification of SWT and SST
LM 285988 LM 286046 LM 286102
Magnetic Switchable ElastomerNBR Compound
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Magnetic field strength H [kA/m]
Mag
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[T]
Advantages
Magnetic behavior of elastomer Miniaturization of valve components Low power consumption Noise reduction Corrosion resistance
Resistance in aggressive media Resistance in Salt Spray Test (ISO
9227) Resistance in Condensation Water
Cost reduction
NBR (other elastomer are similar)
Magnetic Switchable ElastomerMagnetic Behavior
Content
Smart Materials, Condition Monitoring and Industry 4.0
Material Portfolio
Proof of concept for potential applications
Current DevelopmentsSmart Material Applications
Current DevelopmentsSmart Material Applications
Motion Generation Actuator
Dielectrical elastomers
Design of direct switching pneumatic valves withDEA; left valve opend,right valve closed
Stack-actuator Source: Actuator_Proceedings_2014_highres, dielastar
Current DevelopmentsSmart Material Applications
Motion Generation Actuator
No current Left coil energized Right coil energized
Volume flow
Magnetic Elastomeric Diaphragm Pump
Fuel vapor refeed pump
Current DevelopmentsSmart Material Applications
Wear Detection Sensor
Conductive Elastomeric Seal Body
Initial condictionc During application wear occurs: Signal indicateschange of the sealing
Current DevelopmentsSmart Material Applications
Wear Detection Sensor
-0.1
0
0.1
0.2
0.3
0.4
0.5
0.6
0 5 10 15
Time
Wea
r Good
Warning
Exchange
Current DevelopmentsSmart Material Applications
Electromagnetic Shielding
Conductive Elastomeric Gasket
Metal grid
Elastomeric gasket
Conductive elastomeric
gasket
Current DevelopmentsSmart Material Applications
Electromagnetic Shielding
Conductive Elastomeric Gasket
Current DevelopmentsSmart Material Applications
Temperature Sensor
Thermochromic coating
Thermochromiccoating before testingon the test rig
Thermochromic coating before testing on thetest rig: temperature on sealing lip at 180 °C
Membrane temperaturein a electronic device
Surrounding temperature 170°C (3 hour)
+ 13,5 V DC for 1,5 h
Highest temperature: plastic part: 210-220°C
Seal temperature (top): 190-200°C
190°C-200°C
210°C-220°C
Current DevelopmentsSmart Material Applications
HeatElast – Molded heating elements
Electrical conductive rubber
Project HeatElast – Molded heating elements (CC LES)
Project Target Develop heating elements out of mouldable material
Product characteristics
• Below 50V up to 200°C temperature can be achieved• Variety of geometries are feasible
Status Effect has been established in laboratory conditions.
Bending of the elastomerin a thermal imaging camera
Electrical current heats the water drop on the elastomer till it boils.
THANK YOU !
Dr. Boris TraberFreudenbergFreudenberg Sealing Technologies GmbH & Co. KGTechnology & InnovationMaterial TechnologyGlobal Director of Advanced Material Development D-69465 Weinheim
Telefon: +49 (6201) 80 3339Mobil: +49 (173) 3090654mailto: [email protected]