Activity modification of a new type of carbamide-based non-polluting solid powdery medium used in the sulphonitrocarburising process Online publication date: Wed, 06-Jan-2021
by Mihai Ovidiu Cojocaru; Mihai Branzei; Mariana Ion; Leontin Nicolae Druga
International Journal of Surface Science and Engineering (IJSURFSE), Vol. 14, No. 4, 2020
Abstract: Carbamide (technical grade urea) is frequently used as a highly efficient active component in the mediums used for ferritic or austenitic nitrocarburising processes, and across a wide range of temperature values, ranging from values below 590°C required for achieving the ferritic nitrocarburising process, to values above 800°C required for the austenitic nitrocarburising process. The carbamide activity generates a particularly intense layer of growth kinetics. This paper studies the ability of carbamide to supply nitrogen and carbon, in the temperature range 550-950°C. It was concluded that this process varies by temperature, and for a composition of the solid powdery medium (35% carbamide, 50% carbon, 10% sulphur and 5% ammonium chloride) at 820°C the carbon potential level is higher compared to the nitrogen one.
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