Abstract
NiCr3C2 coatings have been applied to Ti-6Al-4V and Inconel 718 substrates using direct current magnetron sputtering. The substrate surface finish, bias voltage, percentage bias and deposition rates were varied systematically. The effect of changing sputtering parameters on the resultant microstructure was characterized using scanning electron microscopy and microhardness measurements. The erosion resistance of the coatings to an Al2O3 abrasive stream was determined at 30° and 90° impingement angles and related to the process parameters. The dominant erosion mechanisms at the two impingement angles were determined using scanning electron microscopy.
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