先進復合材料工藝理論基礎-界面課件

先進復合材料工藝理論基礎

第三講：界面反應主講人：于家康Tel：88494987(O）88486066（Lab)（M)Email:提綱引言金屬-陶瓷界面反應自生復合材料的界面反應引言外加復合材料：金屬基：C+AlAl4C3陶瓷基：C+SiSiC碳基：聚合物基：金屬-陶瓷界面反應鋁與陶瓷：3SiO2+4Al→2Al2O3+3Si金屬-陶瓷界面反應鈦與陶瓷：5Ti+B4C→4TiB+TiC自生復合材料的界面反應自生工藝中的反應自生反應熱力學自生陶瓷相的形成機理自生復合材料的顯微組織自生工藝中的反應固-液反應

放熱彌散（XD)自生工藝中的反應固-液反應

反應熱壓（RHP)3TiO2+4Al+6B→2Al2O3+3TiB2MolecularratioofinstartingTiO2–Al–Bmaterialsandnominalcontentofgeneratedphases(vol.%)incompositeproducts

自生工藝中的反應固-液反應

燃燒輔助鑄造5Ti+B4C→4TiB+TiCastoichiometricamountofreactantpowdersisfirstblendedthoroughlyandthencompactedintopellets.Thecompactedpelletandtherequiredamountofmatrixaremeltedandthencastintoagraphitemold.Theceramicreinforcementsareformedinsituduringmeltingviaexothermicreactionsbetweenthereactants自生工藝中的反應固-液反應

熔劑輔助合成（FAS)3K2TiF6+13Al→3TiAl3+3KAlF4+K3AlF62KBF4+3Al→AlB2+2KAlF4AlB2+TiAl3→TiB2+4AlDuringthesynthesis,mixedsaltsofpotassiumhexafluorotitanate(K2TiF6)andpotassiumtetrafluororate(KBF4)areintroducedintoastirredaluminummeltwithanatomicratioinaccordancewithTi/2B自生工藝中的反應固-液反應

熔劑輔助合成（FAS)自生工藝中的反應固-液反應

反應自發(fā)浸滲（RSI)3SiO2+4Al→2Al2O3+3SiSiO2particulatepreformplacedinsideaquartztubeof9

mmdiameterand15

mmlengthisimmersedintheAlmeltAlmatrixcompositesreinforcedwithmicroAl2O3/AlparticlesviareactiveinfiltrationofmoltenAlintopreformsofSiO2orMg+SiO2mixturesat1348

K自生工藝中的反應氣-液-固反應(VLS)2Ti+N2→2TiNAl–4.5Mg–6.2Ti(inwt.%)parentalloywasmeltedinaninductionfurnace,andsubsequently,thechamberwasback-filledwithpurifiedargon.Uponreachinganappropriateprocessingtemperature,cleanN2gaswasintroducedintotheAlalloymelt自生工藝中的反應固-固反應

機械合金化(MA)Mechanicalalloying(MA)isasolidstatepowderprocessingmethodwhichinvolvesrepeatedcolddrawingandfractureofparticlesasaresultofthehighenergyball–samplecollisions.Thismethodcanbeusedtoproducefine-grainedalloyedpowderparticlesinmetal–metalandmetal–ceramicsystems自生工藝中的反應固-固反應

反應熱壓(RHP)Nominalcontentofgeneratedphases(vol.%)ininsituTi-basedcompositesbyassuminginsitureactionstakeplacecompletelyinallsystems

自生反應熱力學Al–Ti–CsystemChangeofGibbsfreeenergyΔGasatemperatureforTiC,Al4C3andAl3Tiformation自生反應熱力學Al–Ti–CsystemThermodynamicdataasafunctionoftemperatureforthereaction3Al3Ti(s)+Al4C3(s)→3TiC(s)+13Al(l)自生反應熱力學Al–Ti–CsystemThermodynamicdataasafunctionoftemperatureforthereaction3Al3Ti(s)+C(s)→TiC(s)+3Al(l)自生反應熱力學Ti–B4CsystemChangeofGibbsfreeenergyΔGasatemperatureforthereactions5Ti+B4C→4TiB+TiCand3Ti+B4C→2TiB2+TiC,respectively5Ti+B4C→4TiB+TiC3Ti+B4C→2TiB2+TiC自生反應熱力學Ti–TiB2systemChangeofGibbsfreeenergyΔGandformationenthalpyΔHasatemperatureforthereactionTiB2+Ti→2TiB自生陶瓷相的形成機理熔體中固-固反應Ti2O3(s)+2AlB2(s)→2TiB2(s)+-Al2O3(s)3TiO2(s)+3AlB2(s)+Al(l)→3TiB2(s)+2-Al2O3(s)自生復合材料的顯微組織OpticalmicrographshowinguniformdistributionoffineAl2O3andTiB2particulatesinaluminummatrix.Thecomposite