بررسي تاثير نانو ويسكرهاي SiC بر روي خواص فيزيكي و مكانيكي نانو كامپوزيت SiC/Epoxy و مقايسه تاثير نانو ذرات با ميكرو ذرات SiC

چكيده انگليسي :

Study of SiC Nanowhiskers Effect on Physical Mechanical Properties of SiC Epoxy Nanocomposite and Comparsion of SiC Nanoparticles with Microparticles Mohammadreza Naeimirad m naeimirad@tx iut ac ir Date of Submission 2011 04 20 Department of Textile Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language FarsiSupervisor Ali Zadhoush zadhoush@cc iut ac irAbstract Silicium carbide SiC is one of the most important materials in composite and electronic applications SiC has good properties such as high thermal resistance semi conductivity good wear resistance andsuitable mechanical properties high hardness and modulus SiC is synthesized by a reaction between silicaand coke at very high temperature from this product such as fibers microparticles and recentlynanoparticles nanowhiskers can be produced SiC has many usage in industries such as semi conductorin electronic devices cutter tools heat resistance materials and ceramic polymeric composites Alsothermoset composites specific epoxy based composites have many application in aerospace industry SiCnanowhiskers are new product of this material that have high aspect ratio L D in this research 0 5 1 2 4wt SiC nanowhiskers nanoparticles microparticles filled nanocomposites were made using Epoxy resinas matrix and ultrasonic processor for their dispersion The influence of particle size from micro to nanoand aspect ratio from nanoparticle to nanowhisker on the physical mechanical properties were investigated Measurement and characterization were carried out using tensile flexural wear hardness DSC FT IR XRD and SEM methods Ultrasonic increased mechanical properties by about 5 due to sono chemicaleffects Addition of microparticles by 1 wt caused an increase of 15 in tensile and flexural modulus and25 in strength Higher content of microparticles reduced the achieved mechanical properties it is due theparticles interaction As for nanoparticles 1 wt content produced 17 increase in modulus and 27 increase in strength this is due to smaller particle size and higher specific area Reduction in propertieswere obtained using higher content For nanowhisker composites for 2 wt an increase on 35 in tensileand flexural properties and a reduction with higher content were achieved this could be due to higheraspect ratio as compared with nanoparticles tensile result of composites were compared with teoricalmodels in particulated and fiberus composites such as guth caron cox and young Also the mechanicalresults have been investgated by statistical analysis two way Anova that underscore the effects of fillersand their wt changes Nanoparticle composites had higher tribological properties wear and friction thanneat epoxy resin at pin on disk test they also offered better tribological properties compared withnanowhisker composites this is related to their spherical shape and increase of surface slip by particles Hardness and DSC test results don t show any changes in hardness or glass transmission temperature withparticle loading in epoxy nanocomposites XRD spectrums resulted that materials have same effects withcomparsion of standard spectrum and nano crystal size due the shrer law FT IR spectrums show thecrosslinking chemical groups that is due to hardener reaction with epoxy resin Keywords Silicium carbide Nanocomposite Nanowhisker Epoxy resin Mechanical properties

نعيمي راد، محمدرضا

بررسي تاثير نانو ويسكرهاي SiC بر روي خواص فيزيكي و مكانيكي نانو كامپوزيت SiC/Epoxy و مقايسه تاثير نانو ذرات با ميكرو ذرات SiC

سيليسيم كاربيد , نانو كامپوزيت , اپوكسي , خواص مكانيكي