先進復(fù)合材料工藝?yán)碚摶A(chǔ)-界面課件

先進復(fù)合材料工藝?yán)碚摶A(chǔ)

第三講：界面反應(yīng)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(yīng)自生復(fù)合材料的界面反應(yīng)引言外加復(fù)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(yīng)鋁與陶瓷：3SiO2+4Al→2Al2O3+3Si金屬-陶瓷界面反應(yīng)鈦與陶瓷：5Ti+B4C→4TiB+TiC自生復(fù)合材料的界面反應(yīng)自生工藝中的反應(yīng)自生反應(yīng)熱力學(xué)自生陶瓷相的形成機理自生復(fù)合材料的顯微組織自生工藝中的反應(yīng)固-液反應(yīng)

放熱彌散（XD)自生工藝中的反應(yīng)固-液反應(yīng)

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

自生工藝中的反應(yīng)固-液反應(yīng)

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

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(yīng)固-液反應(yīng)

熔劑輔助合成（FAS)自生工藝中的反應(yīng)固-液反應(yīng)

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

mmdiameterand15

mmlengthisimmersedintheAlmeltAlmatrixcompositesreinforcedwithmicroAl2O3/AlparticlesviareactiveinfiltrationofmoltenAlintopreformsofSiO2orMg+SiO2mixturesat1348

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

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

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

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