Abstract
The non-vacuum electron beam cladding technique was used to fabricate composite coatings with WC on the surface of Ni3Al intermetallic. The microstructure and phase composition of composite coatings were studied using scanning electron microscopy, energy dispersive X-ray analysis, and X-ray diffraction analysis. The results showed a good metallurgical bond of WC particles with the Ni3Al intermetallic matrix. Addition of CaF + LiF flux mixtures in the initial cladding powder reduces the loss of tungsten carbide powder compared to MgF2 flux during electron-beam processing. Effect of tungsten carbide volume fraction, particle size and shape on the microhardness, wear mechanism of composite coatings was demonstrated. The microhardness of produced composite coatings was 1.3–1.5 times higher than substrate material and wear resistance was 2.2 times higher than Ni3Al.
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