Effects of hexagonal boron nitride and sintering temperature on mechanical and tribological properties of SS316L/h-BN composites

► 20vol% h-BN in stainless steel gave the lowest friction coefficient. ► Sintering temperature of 1200°C was recommended for optimum friction coefficient. ► h-BN in stainless steel transformed to a boride liquid phase at 1250°C. In this work, hexagonal boron nitride (h-BN)-embedded 316L stainless st...

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Bibliographic Details
Published in:Materials in engineering 2013-04, Vol.46, p.588-597
Main Authors: Mahathanabodee, S., Palathai, T., Raadnui, S., Tongsri, R., Sombatsompop, N.
Format: Article
Language:English
Subjects:
Austenitic stainless steels
Borides
Boron nitride
Composite
Friction
Hardness
Heat resistant steels
Hexagonal boron nitride
Lubrication
Sintering (powder metallurgy)
Sliding wear
Stainless steel
Tribology
Wear rate
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Summary:► 20vol% h-BN in stainless steel gave the lowest friction coefficient. ► Sintering temperature of 1200°C was recommended for optimum friction coefficient. ► h-BN in stainless steel transformed to a boride liquid phase at 1250°C. In this work, hexagonal boron nitride (h-BN)-embedded 316L stainless steel (SS316L/h-BN) composites were prepared using a conventional powder metallurgy process. In order to produce self-lubricating composites, various amounts of h-BN (10, 15 and 20vol%) were incorporated. Effects of h-BN content and sintering temperature on the mechanical and tribological properties were of primary interest. The results suggested that an increase in h-BN content reduced the hardness of the composites, but that the hardness could be improved by increasing the sintering temperature. Addition of h-BN up to 20vol% improved the friction coefficient of the composites. At a sintering temperature of 1250°C, h-BN transformed into a boride liquid phase, which formed a eutectic during cooling and exhibited a deterioration effect on lubricating film formation of the h-BN, resulting in an increase in the friction coefficient of the composites. The specific wear rate was greatly reduced when the composites were sintered at 1200°C. The lowest friction coefficient and specific wear rate in the composites could be found under the experimental conditions used in this work when using 20vol% of h-BN at a sintering temperature of 1200°C.
ISSN:0261-3069
DOI:10.1016/j.matdes.2012.11.038