结构化学定义与分类课件.ppt

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1、EST2.3.4.Lubricantisamaterialputonasurfacetoreducefriction.Oilisusedasaliquidlubricantandgraphiteasasolidlubricant.润滑剂是涂于物体表面以减少摩擦的物质。石油是液体润滑剂，石墨是固体润滑剂。Achemicalchangeisachangeinwhichnewsubstancesareformedwithdifferentproperties,e.g.chalk,whenheated,ischemicallychangedtolimeandcarbondioxide

2、.Metals:ferrous(basedoniron)andnon-ferrousferrous:IronandsteelIron:castiron铸铁（pigiron）wroughtiron锻铁Steel:(a)Lowcarbonsteel(carboncontentsupto0.15%),(b)Mildsteel:(carboncontent0.15%-0.25%),(c)Highcarbonsteel:(carboncontent0.5%-1.5%)(d)stainlesssteelNon-ferrousmetals:Basemetals,noblemetalsand

3、alloysBasemetals:aluminum,copper,lead,magnesium,tinandzinc,etcNoblemetals:gold,silver,platinum,etcAlloys:brass,bronze,