The Effect of Plasma Nitriding Time on the Tribological and Mechanical Properties of Electroless Nickel–Boron-Reduced Graphene Oxide (Ni–B-rGO) Nano-Composite Coatings.

Autor: Wetwet, Zainab, Mahboubi, Farzad
Zdroj: Transactions of the Indian Institute of Metals; Sep2024, Vol. 77 Issue 9, p2845-2855, 11p
Abstrakt: In this research, the effect of plasma nitriding (PN) time on wear properties and hardness of Ni–B-20.5rGO electroless composite coatings was investigated. The PN process was performed in three different times (60, 120 and 180 min) at 400 °C under N2-H2 atmosphere on AISI 4140 steel. The results showed that adding 20.5 mg/L of rGO to the coating composition transformed its structure from an amorphous state to a quasi-crystalline. It also increased the hardness and improved the wear resistance of the coating. In contrast with heat treatment, PN significantly changes the surface morphology of electroless Ni–B coatings. Moreover, plasma nitriding affected the grain size and reduced the boron content due to the formation of hBN phase. NiB/20.5G/120PN sample had the highest hardness (1496 HV0.1) and wear resistance (0.24 × 10−9 kg/N.m). It also showed a low friction coefficient and the most uniform crack-free worn surface. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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