Thermal Conductivity of Epoxy Compounds Enriched With Aluminium Nitride (Aln)

Abstract

Purpose of this thesis is Estimation of  thermal conductivity of epoxy composites enriched with  Aluminium Nitride(AlN) micro-fillers  with analytical modeling. Thermal conductivity of epoxy composite is find out by measuring heat flow with the help of  Unitherm TM Model. In analytical model, a mathematical model is developed to evaluate the effective thermal conductivity of the composites filled with fillers. The conductivity values measured and then compared with the analytical ones. These composites with AlN created and thermal conductivities of the samples were measured. Observations can be made  with 25 % of volume AlN in epoxy matrix, thermal conductivity has elevated by    7 times while with 35% volume the thermal conductivity has elevated by  65 folds which is higher than epoxy matrix. A decision  to draw from the measured values are in close to the proposed model  upto fraction of 35 % of vol.  at which quick rise is observed in the  value of K_eff. This quick rise in effective thermal conductivity is because of  overlap between filler particle which leads to the emergence of conductive chain. The % of  volume after which this  occurs is called percolation threshold.