Abstract
Aluminium nitride (AlN) powders are thermodynamically unstable in an aqueous system. Polyamide (Nylon) coating of the carbothermic method AlN powders can confer a great degree of water-resistibility on them. However, nylon coated powders have high organic contents including chloroform and show bad formability. Moreover, this method cannot be applied to direct nitridation AlN powders.
In this study, we succeeded in nylon coating both direct nitridation and carbothermic method AlN powders by a new preparation method, carrying out polymerization at the solid-liquid boundary after fixing a monomer on the surface by drying. As a result, the nylon coated powders have low organic contents with no chloroform and show good formabilty.
In addition, the sintered bodies of the nylon coated powders which were prepared with oxidation treatment of the direct nitridation AlN powders were found to contain Al2Y4O9 and to have high thermal conductivity.
