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1、金属基复合材料(Metalmatrixcomposites)Acompositebasedonmetaloralloyandreinforcedwithfibers,whiskersandparticles.Thetemperaturerangeis350~120degrees,dependingonthebasemetalused.Thecharacteristicsinmechanicsforhighlateralandshearstrength,mechanicaltoughnessandfatigueperformance,b
2、utalsohasthethermalconductivity,wearresistance,thermalexpansioncoefficient,gooddampingandmoisture,noagingandnopollutionetc..Forexample,thecarbonfiberreinforcedaluminumcompositehasaspecificstrengthof3~4x107mm,aspecificmodulusof6~8x109mm,andagraphitefiberreinforcedmagnesi
3、um,notonlythespecificmoduluscanreach1.5x1010mm,butalsothethermalexpansioncoefficientisalmostclosetozero.Metalmatrixcompositesreinforcedbycategoryclassificationofthebody,suchasfiberreinforced(includingcontinuousandshortcut),whiskerandparticlereinforcedmetaloralloymatrix,
4、accordingtothedifferentmetalmatrixcompositescanbedividedintoaluminum,magnesium,titanium,copperbase,basehightemperaturealloybasemetalbetweencompoundbasedandrefractorymetalmatrixcompositematerials.Becauseofthehighprocessingtemperature,complexprocess,difficultcontrolofinte
5、rfacialreactionandhighcost,thematurityofthecompositesisfarlessthanthatofresinmatrixcomposites,andtheapplicationrangeissmall.Resinmatrixcompositescanonlybeusedatdifferenttemperaturesbelow350degreescelsius.Inrecentyears,avarietyofmetalmatrixcompositessuitableforuseat350~1
6、200Chavebeendevelopedrapidly.Metalmatrixcompositeisakindofcompositematerialmadeofmetaloralloymatrixandvariousreinforcingmaterials.Thereinforcingmaterialscanbefibrous,granularandwhiskerlikesiliconcarbide,boron,aluminaandcarbonfiber.Inadditiontometalaluminumandmagnesium,m
7、etalmatrixalsodevelopsnon-ferrousmetalssuchastitanium,copper,zinc,lead,beryllium,superalloyandintermetalliccompound,andferrousmetalasmetalmatrix.Inadditiontothehighstrengthandhighmodulusofresinmatrixcomposites,metalmatrixcompositescanresisthightemperature,nonburning,non
8、moistureabsorption,goodthermalconductivityandradiationresistance.Hightemperaturematerialsforimpressivenessaero