材料科学英语Unit 4 Lecture 2 One Metals.ppt

TheClassificationofMaterials

SectionOneMetalsUnit4

Pre-reading1metalpolymerceramiccompositeMatchthenamesofmaterialslistedbelowwithcorrespondingpictures.Metal(金属)ceramic(陶瓷)polymer(聚合物)composite(复合材料)

Pre-reading2wokcrispercasserolereinforcedconcreteCanyoulistsomeexamplesofeachcategoryusedindailylife?

Therearetensofthousandsofmaterialsavailableforuseinengineeringapplications.Mostmaterialsfallintooneofthethreeclassesthatarebasedontheatomicbondingforcesofaparticularmaterial.Theyaremetals,ceramicsandpolymers.Additionally,differentmaterialscanbecombinedtocreateacompositematerial.ReadingComprehension

ReadingComprehensionWhat’retheclassificationsofmaterials?Metal,ceramics,polymerandcomposite

ReadingComprehensionIron/Steel（铁／钢）:Steelalloysareusedforstrengthcriticalapplications.Aluminum（铝）:Aluminumanditsalloysareusedbecausetheyareeasytoform,readilyavailable,inexpensive,andrecyclable.Copper（铜）:Copperandcopperalloyshaveanumberofpropertiesthatmakethemuseful.TypicalUsesofMetals

ReadingComprehensionTitanium（钛）:Titaniumalloysareusedforstrengthinhighertemperature(~1,000℉)applications.Nickel（镍）:Nickelalloysareusedforstillhighertemperature(~1,500℉-2,000℉)applications.Refractorymaterials（耐熔性材料）areusedforthehighesttemperature(2,000℉)applications.

ReadingComprehensionIron／Steel钢铁Aluminum铝Copper铜Titanium钛Nickel镍Refractorymaterials耐熔性材料

ReadingComprehensionWhichoftheabovemetalsisenvironmentalfriendly?Whichoftheabovemetalsaregoodatresistingcorrosion?Whichoftheabovemetalsismostsuitableforthehighesttemperature?AluminumNickle,CopperTitaniumRefractorymaterials

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