Metal Matrix Comp
Transcript of 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