Microstructure and tribological property of self-lubrication CBN abrasive composites containing molybdenum disulfide

Abstract

Purpose This paper aims to evaluate the influence of molybdenum disulfide (MoS2) concentrations (5, 7.5, 10, 12.5 and 15 Wt.%) on the microstructure and tribological property of the self-lubrication cubic boron nitride (CBN) abrasive composites. Design/methodology/approach Three point bending method and rotating sliding test are used to evaluate the flexural strength and tribological property of self-lubricating CBN abrasive composites. Microstructure, wear morphology of the ball and scratch are supported by scanning electron microscopy, optical microscope and three-dimensional confocal microscopy, etc. Findings The MoS2 concentration has a significant influence on the interface microstructure between CBN abrasives and matrix alloys, and thus, affects the flexural strength of CBN abrasive composites. The grain fracture modes of CBN abrasive composites are transformed from the transgranular fracture into intergranular fracture as the MoS2 concentrations increase. Additionally, the friction coefficient of as-sintered samples decreases with the MoS2 concentrations. The MoS2 concentrations of 10 Wt.% are final determined to fabricate self-lubricating composites in basis of the mechanical and lubricating property. Originality/value The ball is fabricated under vacuum sintering process. The tribological property of self-lubricating CBN abrasive composites is evaluated in terms of the friction coefficient and morphologies of the ball and scratches after rotating sliding tests.

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“…High carbon equivalent gray cast iron (HCEG-CI) contained with over 3.6% carbon equivalent has been widely used to fabricate brake components in auto industry owing to its high wear resistance ability and excellent thermal conductivity [1][2][3] . However, the mechanical properties of HCEGCI materials are severely affected due to the existence of lamellar graphite particles [4] . Numerous published studies reported that the mechanical properties of HCEGCI materials could be further improved by employing various alloy elements [5][6][7] .…”

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