Metal Matrix Comp

8/11/2019 Metal Matrix Comp

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OutlineOutline IntroductionIntroduction

Metal MatrixMetal Matrix

ReinforcementReinforcement

Fabrication methodsFabrication methods

Properties of AutomotiveProperties of AutomotiveMMCMMCss

ApplicationsApplications

ConclusionConclusion


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Introduction toIntroduction to MMCMMCss Metal Matrix composites have low volumeMetal Matrix composites have low volume

reinforcement in order to maintain metallicreinforcement in order to maintain metallicproperties.properties. Ideal for lower density metalsIdeal for lower density metals

These composites find use in variousThese composites find use in variousaspects of automotive design.aspects of automotive design. From high performance Formula 1 parts toFrom high performance Formula 1 parts to

cheaper more reliable OEM replacementcheaper more reliable OEM replacementparts for consumer automobiles.parts for consumer automobiles. Engines, Brakes, andEngines, Brakes, and DrivetrainDrivetrain equipmentequipment


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Metal MatrixMetal Matrix The Matrix material typically consists ofThe Matrix material typically consists of

Aluminum and Titanium.Aluminum and Titanium.Aluminum for Automotive industry (Aluminum for Automotive industry (AMCAMCss))

Titanium for high performance needsTitanium for high performance needs

Materials chosen based on criteria:Materials chosen based on criteria: Good strength/weight ratioGood strength/weight ratio

Good thermal and mechanical propertiesGood thermal and mechanical properties Ease of fabrication andEase of fabrication and machinabilitymachinability

Cheap and abundantCheap and abundant


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ReinforcementReinforcement

Reinforcement methods includeReinforcement methods include

continuous and discontinuous fibers andcontinuous and discontinuous fibers andparticle.particle.

Particle reinforcement provides manufacturesParticle reinforcement provides manufactureswith isotropic properties of metal with all thewith isotropic properties of metal with all thebenefits that the reinforcement offers.benefits that the reinforcement offers.

SiCSiC, B, B44C,C, TiCTiC,, TiBTiB, TiB, TiB22, SiO, SiO22, Al, Al22OO33,, FeFe22OO33 Volume usually never exceeds 20% vol.Volume usually never exceeds 20% vol.


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Properties of AutomotiveProperties of Automotive MMCMMCss Properties that are improvedProperties that are improved

Specific stiffness (E/Specific stiffness (E/))

Specific strengthSpecific strength

Fatigue resistanceFatigue resistance

Wear resistanceWear resistance Coefficient of thermal expansionCoefficient of thermal expansion

Thermal conductivityThermal conductivity

MMCMMCss maintain properties at a higher rangemaintain properties at a higher rangeof temperaturesof temperatures


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Properties of AutomotiveProperties of Automotive MMCMMCss

ContCont

Al with 20%Al with 20% volvol SiCSiC

yield strengthyield strengthincreases by 50MPaincreases by 50MPa

Tensile strengthTensile strengthincreases byincreases by

110MPa110MPa

Titanium MMC withTitanium MMC with10%10% volvol TiBTiBmaintain propertiesmaintain propertiesat temperatures overat temperatures over

800800ooCC


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Applications: Pistons andApplications: Pistons and

Connecting RodsConnecting Rods AMC Pistons andAMC Pistons and

connecting rodsconnecting rods Increased engine efficiencyIncreased engine efficiency

due to less rotating massdue to less rotating mass

$$$ reduced as less time is$$$ reduced as less time is

spent balancing rotatingspent balancing rotatingpartsparts

Lower thermal expansionLower thermal expansionallows for tighter tolerancesallows for tighter tolerancesaround the piston ringsaround the piston rings

Wear properties exceed castWear properties exceed castironiron

Higher allowed temperaturesHigher allowed temperaturesallow greater efficiencyallow greater efficiency


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Applications:Applications: DrivetrainDrivetrain DriveshaftsDriveshafts, axles and, axles and

transmission parts achievetransmission parts achievegreater critical speeds andgreater critical speeds andhigher loads withhigher loads with MMCMMCss

Engine power is increasedEngine power is increased

as higher critical speedsas higher critical speedsare safely achievedare safely achieved

6061 Aluminum with 20%6061 Aluminum with 20% volvolAlAl22OO33 has a critical speed ofhas a critical speed of

6100rpm 17.3% higher than6100rpm 17.3% higher thanthat of conventional 6061that of conventional 6061(5200rpm)(5200rpm)


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Applications: Braking SystemsApplications: Braking Systems Braking systemsBraking systems

made from highermade from highervolumevolume MMCMMCss Resist wear meanResist wear mean

longer lifelonger life

UnsprungUnsprung weightweightincreases engineincreases engineoutputoutput

More resistance toMore resistance tobrake warping asbrake warping asthermal cycling doesnthermal cycling doesnttcause distortioncause distortion


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ConclusionConclusion Metal Matrix Composites maintain their metallicMetal Matrix Composites maintain their metallic

properties and become valuable in automotiveproperties and become valuable in automotiveapplicationsapplications

Thermal and mechanical properties improvedThermal and mechanical properties improved

Specific strength makes them ideal for OEMSpecific strength makes them ideal for OEMreplacement as well as high performance needsreplacement as well as high performance needs

Provide greater efficiency increasing outputProvide greater efficiency increasing output

Greater reliability reducing overall costGreater reliability reducing overall cost

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Metal Matrix Comp