Influence of plasma arc power on the melting of the envelope layer containing NiCrBSi alloy and the surface coating quality during plasma heating

Abstract

The experiments are carried out to obtain coatings by plasma heating of an envelope containing a NiCrBSi alloy with different thicknesses (0.25; 0.5; 1.00 mm) on exposure to different powers (100; 140; 160 A). The resulting coatings have different depths of the hardened layer. With a thin preliminary envelope layer (0.25 and 0.5 mm), defects easily appear under the influence of high power. With a thicker envelope layer (1 mm), the ability of the alloy to diffuse into steel is limited. The low power of the plasma arc of 100 A limits the diffusion and transformation of the molten pool, sufficient for saturation with alloying elements of a thick layer of the envelope (0.5 and 1 mm).