Surface protection of high-temperature components for power generation
has become one of the most advanced fields of modern engineering. In
this area, a multilayer coating of chromium oxide/chromium carbide for
erosion-corrosion protection of furnace boiler-walls has been produce
d by thermal spray continuous detonation system (CDS) technique. These
composite coatings present a microstructure made by alternate phases
of chromium carbide cermet and oxides resulting from preferential oxid
ation of chromium compounds. Mechanisms for the generation of such mix
ed structure are discussed. Produced coatings have been characterized
by electron probe microanalysis, X-ray diffraction and ultramicrohardn
ess techniques, combined with traditional procedures of metallographic
preparation, quantitative image analysis, and microhardness testing.
(C) 1998 Elsevier Science S.A.