TWO-LAYER PROTECTIVE COAT OF HEAT STRESSED PARTS APPLIED BY A PLASMATIC SPRAY OR HIGH-TEMPERATURE

摘要

A protective coating for heat stressed parts, particularly firing chambers of steam boilers, comprises a first, base, layer and a second, upper, layer. The base layer comprises nickel and 10 to 30% by weight of chromium and the upper layer comprises zirconium dioxide and up to 20%, more particularly up to 10%, by weight of calcium oxide.