Tribological properties of bismuth sulfide (BiS) particles as grease additive for aluminum forming operations

G. PRIETO; F. KAFEXHIU; W. TUCKART; B. PODGORNIK

WEAR

ELSEVIER SCIENCE SA

Lugar: Amsterdam; Año: 2022 vol. 506

0043-1648

In the present work, the friction and galling-prevention properties of a lubricating grease with the addition of BiS particles have been investigated. To achieve this, commercial lithium greases containing BiS, hexagonal boron nitride, and graphite were employed to lubricate steel–aluminum contacts under different tribological configurations, namely reciprocating sliding tests with varying normal loads and sliding speeds and load scanner tests at 25, 200 and 300 °C. The addition of BiS enhanced the tribological response of the grease in reciprocating tests and provided protection against galling up to temperatures of 200 °C. However, its performance severely deteriorated at 300 °C. Thus, BiS showed promising properties as an additive for lubricating greases operating under a wide range of normal loads, sliding speeds, and moderate temperatures.