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1、Unit7MaterialsScienceWhatismaterials?StuffIngeneralanythingmadeofmattermorenarrowlysubstancesorcomponentswithcertainphysicalpropertiesthatareusedasinputstoproductionormanufacturing.naturalstuffwoodbonestrawwoolcottonsilkstoneWhatmaterialsdoyouknow?syntheticstuffsteelpotteryplasticsemi
2、conductorsconcretetextilespapergeneralcategoriescomposite['kɔmpəzit]复合材料semiconductormetalpolymer聚合物/高分子化合物biomaterialceramic[si'ræmik]陶瓷PropertiesandapplicationsofmaterialsMaterialsPropertiesApplicationscompositesemiconductormetalpolymerbiomaterialceramicTask1:Matchthepictureswiththe
3、righttypes.(B)1.Composite.Compositesareusedbecauseoverallpropertiesofthecompositesaresuperiortothoseoftheindividualcomponents.Manyracketswhichareusedinsportssuchastennisandbadmintonareallmadeofcomposites.(E)2.Semiconductor."Semiconductor"meansamaterialcanconductelectricitywithabitofhe
4、lpintheformofadded"impurities."YourCD,DVDplayer,telephoneandradioalldependonsemiconductors(A)3.Metal.Itisakindofmaterialwithobviouspropertyofconductingheatandelectricity.Themostcommontypesofmetalsincludesteel,iron,copper,aluminumandsoon.(C)4.Polymer.Itisakindofmaterialwiththepropertyo
5、flightweightandpoorconductingofelectricityandheat.Plastic,paintandrubberareallmadeofpolymer.(F)5.Biomaterials.Scientiststrytomimicnature'sdesignstocreatematerialsforotheruses,suchasusingthefoamstructureofboneasaninspirationfordesigningmaterialsthatarelightweightandstrong.(D)6.Ceramic.
6、Examplesofsuchmaterialscanbeanythingsuchasclay.Someoftheusefulpropertiesofceramicsincludehighmeltingtemperature,lowdensity,highstrength,hardness,andcorrosionresistance.Manyceramicsaregoodelectricalandthermalinsulators.MaterialsPropertiesApplicationscompositesuperiortoindividualsemicon
7、ductorconductivitybetweenconductorsandnonconductorsorinsulatorsmetalhard,strongconductorpolymerlightweight,insulator,cheaper,easiertoformintoshapesbiomateriallightweight,strongceramichard,strong,insulatorhighmeltingpointcorrosionresistanceSomenewmaterialsTask2:1.Matchthenewswiththerig
8、hthea
