Author(s): , ,

Keywords: , , , , , , , , , ,

Abstract: Composite spray coatings containing Al2O3 and AlN were prepared and their tensile bonding strength, microhardness, corrosion behavior and thermal conductivity were compared to those of pure Al2O3. The goal of this study was to identify a spray coating with an improved thermal conductivity over that of Al2O3 for use in coating heat exchangers, furnace walls, heat pipes, etc. The coatings that were prepared had AlN : a-Al2O3 ratios of 4:6 and 6:4. It was determined that the thermal conductivity of the spray coatings increased with increasing AlN content, as did the coatings’ resistance to corrosion; however, the microhardness and tensile bonding strength were decreased by the addition of AlN.

Reference: Materials Transactions, 47, 7 (2006) 1649-1653

DOI: 10.2320/matertrans.47.1649