Patent ID: 8679624

Claim:
A method of making a composite material, the method comprising: providing a plurality of aluminum nitride particles; forming a passivation layer over each of the plurality of aluminum nitride particles to form a plurality of passivated aluminum nitride particles, wherein the passivation layer provides inhibition to oxidation and thermal degradation of a surface of the aluminum nitride particles, and wherein forming the passivation layer over each of the plurality of aluminum nitride particles comprises: adding one or more monomers selected from the group consisting of 4,4′-oxydianiline, pyromellitic dianhydride, polyamic acid, BTDA (benzophenonetetracarboxylic acid), 1,4-benzenediamine, MPD (4,4′-methylenebisbenzeneamine), and BTDE (4,4′-carbonylbis(1,2-benzenedicarboxylic acid) to the plurality of aluminum nitride particles to form a mixture; heating the mixture to form the passivation layer over each of the plurality of aluminum nitride particles, the passivation layer comprising the condensation reaction products of the one or more monomers formed over each of the plurality of aluminum nitride particles; and dispersing the plurality of passivated aluminum nitride particles in a polyimide to provide the composite material with a thermal conductivity of about 0.4 W/mK to about 2.5 W/mK.