Effects of hexagonal boron nitride and sintering temperature on mechanical and tribological properties of SS316L/h-BN composites
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Author list: Mahathanabodee S., Palathai T., Raadnui S., Tongsri R., Sombatsompop N.
Publisher: Elsevier
Publication year: 2013
Journal: Materials & Design (0264-1275)
Volume number: 46
Start page: 588
End page: 597
Number of pages: 10
ISSN: 0264-1275
eISSN: 1873-4197
Languages: English-Great Britain (EN-GB)
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Abstract
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 20. vol%) 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 20. vol% improved the friction coefficient of the composites. At a sintering temperature of 1250 ฐC, 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 ฐC. The lowest friction coefficient and specific wear rate in the composites could be found under the experimental conditions used in this work when using 20. vol% of h-BN at a sintering temperature of 1200 ฐC. ฉ 2012 Elsevier Ltd.
Keywords
Composite, Hexagonal boron nitride, Sliding wear
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