TITLE:
Improvement of High Temperature Wear Resistance of AISI 316 ASS through NiCrBSiCFe Plasma Spray Coating
AUTHORS:
N. L . Parthasarathi, Muthukannan Duraiselvam
KEYWORDS:
AISI 316 ASS; NiCrBSiCFe; Plasma spraying; Abrasion; Wear.
JOURNAL NAME:
Journal of Minerals and Materials Characterization and Engineering,
Vol.9 No.7,
July
20,
2010
ABSTRACT: In this work, the microstructural description, mechanical properties and dry sliding wear
features of NiCrBSiCFe plasma sprayed on AISI 316 austenitic stainless steel (ASS) substrate
were examined. Defect-free metallurgically bonded coatings were obtained. Wear tests were
carried out at 2 m/s sliding velocity under the load of 20N for 2000 m sliding distance at
various conditions like room temperature (35°C), 150°C, 250°C and 350°C using a EN-8
medium carbon steel pin as a counterface material. The properties namely coating density,
micro hardness, coefficient of friction (CoF) and wear resistance of the coating were studied.
NiCrBSiCFe plasma spray coated steel substrate showed superior wear resistance properties
than the uncoated steel substrate in all the temperatures. The sliding wear resistance was
improved up to 4.5 times than that of the uncoated material. In wear test carried out at
350oC, the coated substrates showed relatively lesser wear than in other temperatures due to
the oxide formation, which acted as a protective layer. In addition, the shallow ploughing
mode of wear reduced the severity of material removal at 350°C. Using scanning electron
microscope (SEM) pictures, the wear properties of the coated steel substrate were evaluated
in terms of plastic deformation, material transfer and abrasion.