1992 Volume 41 Issue 8 Pages 542-549
The laser glazing of gas-flame sprayed alumina was attempted to produce a coating resistant to hot corrosion with insulation capability. Superficial laser glazing was achieved by scanning a carbon dioxide laser with a large beam diameter at low velocity over the sprayed alumina coating impregnated with silicone sealant. Successful laser-glazing could be achieved by controlling the temperature of the metallic substrate. The laser-glazed alumina exhibited high insulation capability and good resistance to hot corrosion by Na2SO4-V2O5 at 900°C.