汽車發(fā)動機活塞銷的表面改性及摩擦學特性研究.pdf

1、上海大學碩士學位論文汽車發(fā)動機活塞銷的表面改性及摩擦學特性研究姓名：陳銳申請學位級別：碩士專業(yè)：材料加工工程指導教師：吳曉春20040301圭塑查蘭墮主堡塞!望旦塑圭莖塾墊堡窒塑塑重型墮叢絲竺塑竺叢盟型!!～AbstractInordertoimprovethewearandfrictionresistancepropertiesofpistonpin，thispaperchose16Mnsteelastestmaterialandma

2、dethesulfidelayeronthesurfaceofpistonpinbyusingthesulphidingonthebasisofnitridingtoloweritsfrictioncoeffiecntandenhacethewearresistance，andopticalmicroscope，micro—hardnessequipment，SEM。EDAX，TaylorHohsonPrecisionFormtalys

3、urfseries2and19JComnipotenttoolmicroscopewereusedforstudyingthemorphologyandhardnessprofileofnitridedlayerformedbyplasmanitridingandcarbo—nitridingatdifferenttemperature；analyzingtheeffectoftemperatureandatmosphereonthep

4、lasmaSC—Nmultifoldtreatment；exploringthefrictioncoefficientandweartracknlol‘phologyofthemultifoldsulphidingsamples，sulphidingsamplesonthebasisofcarburizing，andearburizingsamplesslidingagainstGCrl5steelandLYl2aluminumallo

5、yrespectively；measuringtheroughnessanddimensionchangeofpistonpinsbeforeandaftersurfacetreatmentResultsshow：plasmanitridingat520。Chasbettercompositivepropertiesinsurfacehardness，micro—hardnessprofileanddiffusiondepth；520。

6、CattdtheatmosphereofCS2：NH3=I：60sulphidnigcanformbettersulfidelayer；multifoldsulphidingandsulphidngonthebasisofcarburizingcanefficientlylowe]‘frictioncoefficient，andimprovethewearresistanceandadhesionresistanceButthemuki

7、foldsulphidingisslightlybetterthanthesulphidingonthebasisofcarbtn。izingThelesultsalsodisplaythatmultifoldsulphdingincreasetheroughnessofpistonpinandthenitridingisthemajorreasonofthisincrease，buttheincreaseofroughnesswill

8、notaffectthewearandfrictionresistanceproperciesofsulfidelayer；multifoldsulphidinghas1“10effectonthedeformationofpistonpin，butcausethediameterinoeaseofpistonpinby002418mm，andthediametercanbecontrolledbyreducingthestandard