Abstract
Potential materials for protective heat-resistant coatings are the so-called fragmentary porous ceramic layers penetrated by a net of microcracks. The fragments can be shifted easily during thermal cycling procedure, and the micro-cracks prevent the throughout crack propagation, which could destroy the coating. Laser surface processing of coatings is one of the effective ways to form the fragmentary layered structure. The peculiarities of laser processing of ZrO2+Y2O3 plasma sprayed coatings deposited onto the steel substrate with the Ni–Cr–Al–Y sub-layer alloy were investigated. The coatings were processed by CW CO2 and Nd:YAG lasers (Fig. 1). The laser processing resulted in melting of the coating surface. The modified coating consisted of a number of macro fragments with sizes 200–500 μm and in turn they consisted of a number of micro-fragments with sizes 20–70 μm. Both types of the fragments are separated by wide (10–15 μm) or narrow (1–5 μm) cracks accordingly. The structure and some properties of the modified coatings such as heat-resistance, hardness, surface roughness, and tightness are investigated depending on the laser output parameters.
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