Smart Materials for Seals with Additional Function

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


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


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


Motion Generation Actuator

No current Left coil energized Right coil energized

Volume flow

Magnetic Elastomeric Diaphragm Pump

Fuel vapor refeed pump


Wear Detection Sensor

Conductive Elastomeric Seal Body

Initial condictionc During application wear occurs: Signal indicateschange of the sealing


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


Electromagnetic Shielding

Conductive Elastomeric Gasket

Metal grid

Elastomeric gasket

Conductive elastomeric

gasket


Electromagnetic Shielding

Conductive Elastomeric Gasket


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


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]

mailto:[email protected]

Smart Materials for Seals with Additional Function

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