Study of Vibration Damping Behaviour of Magnetomechanical Powder Coated Metals and Alloys

Abstract

Materials used for engineering applications should be light in weight, anticorrosive, resist wear and shocks. Most of the metals and alloys used in aerospace, marine, defense, sports and structural applications are subjected to mechanical forces. Alloy steels, non-ferrous alloys and other damping materials limit their vibration damping because of their bulky nature. Several researchers have carried out research on reducing the vibration of bulky alloys using various transformation techniques. This paper discusses the damping behavior of various bulk and coated materials. It is evident that damping capacity is due to internal frictions, porosity and magnetic domains of magneto- mechanical materials. SEM, XRD and Kerr effect studies have been used to understand surface characteristics and coating quality of the thermally sprayed metals and alloys.In this research work, stainless steel-AISI 304 alloy substrate is powder coated by air plasma spray(APS) method using magneto-mechanical Fe16Cr2Al powder of 99.9% purity. Samples with a coating thickness of 50 µm were tested for damping behavior using three point bending method on a dynamic mechanical analyzer. Results were evaluated for damping capacity versus stress/ strain /time and found that there is an improvement in the damping capacity. SEM, XRD images were studied to understand the uniformity in coating, degree of porosity and density of the coating.