بررسي رفتار اصطكاك و ساييدگي آميخته اي از نانو ذرات در روغن هاي روانكار

چكيده انگليسي :

051 The Friction and Wear Behavior of Blend of Nanoparticles In Lubricant Oil Sedigheh Soleymani Osbokolaii s soleymaniosbokolaii@ce iut ac ir December 13 2010 Department of Chemical Engineering Isfahan University of Technology Isfahan 84156 83111 IranDegree M Sc Language FarsiSupervisor Kaghobad Shams k shams@cc iut ac ir AbstractIn this research the friction and wear behavior of blends of nanoparticles and colloidal solvents in commonparaffinic lubricant oils was studied Calcium carbonate with a crystalline structure called calcite was used asnanoparticle Calcite with an average particle size of 70 nm was blended with the common industrial additives suchas overbased calcium solphonate OBCaS overbased magnesium solphonate OBMgS detergents and zinc dialkyldithio phosphate ZDDP as antioxidant to produce nanofluid The stability of the nanofluid samples with variousformulations were examined by UV spectroscopy and capillary tube viscometry The wear test on samples wascarried out by pin on the disc method at the normal load of 90 N a velocity of 0 1 m s and for a running distance of1000 meters The weight loss of disks due to wear was determined right after the wear test by weighing the disksbefore and after the wear test Further deformation of the surface of the discs after the wear test was studied usingscanning electron microscope SEM photography and atomic force microscope AFM Results reveal that theoptimum formulation is achieved when 1 wt of calcite nanoparticles along with 10 wt of OBMgS 10 wt ofOBCaS and 3 wt of ZDDP are used in the base oil The highest value of stability among all samples was obtainedin a lubricant composed of calcite nano particles overbased magnesium solphonate and base oil Capilary tubeviscometry showed that the least time through which the viscosity remained unchanged was 35 minutes and thehighest value of absorption through UV spectroscopy was 0 895 The result of load carrying showed that calcitenanoparticles improved load carrying properties as much as 6 6 compared to overbased magnesium solphonateadditive and 10 in comparison with zinc dialkyl dithio phosphate and 14 2 in relation to overbased calciumsolphonate The weight loss of discs used in wear test for the above samples decreased to 50 11 1 and 45 7 percen respectively The results of wear width revealed a reduction of 15 7 16 6 and 75 7 percent in sampls with calcitenanoparticles along with overbased magnesium solphonate zinc dialkyl dithio phosphate and overbased calciumsolphonate When we used calcite nanoparticles the friction coefficient of disks in presence of lubricants decreasedin all samples However effect of nanoparticles on lubricant samples composed of overbased magnesium solphonateadditive and base oil was significant Further in all samples presence of nanoparticles reduced the frictioncoefficient and this improvement was more profound for the sample composed of calcite overbased magnesiumsolphonate and base oil The scanning electron microscopy and atomic force microscopy results demonstrated thataddition of nano particles leads to less wear and more smooth surfaces in wear test Finally from various test resultsone can conclude that the optimum formulation for most favorable stablility the lowest friction coefficient approximately 0 09 lowest wear width and least weight lost on wear is obtained when base oil overbasedmagnesium solphonate 10 wt and calcite nanoparticles 1 wt are used Keywords Lubricant friction wear load carrying calcite nanoparticles detergent Stability Viscosity absorption

سليماني اسبوكلايي، صديقه

بررسي رفتار اصطكاك و ساييدگي آميخته اي از نانو ذرات در روغن هاي روانكار

سايش , بارپذيري , نانو ذرات كلسيت , پاك كننده , پايداري , ويسكوزيته , جذب