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Effect of h-BN solid nano lubricant on the dry sliding wear behaviour of Al-B4C nanocomposites

Harichandran R., Selvakumar N.

Archives of Materials Science and Engineering

2016

Vol. 77, nr 1

5--11

Purpose: In this paper, three composites with different B4C content and fixed h-BN nanoparticles reinforced aluminium composites were fabricated through ultrasonic cavitation assisted casting. The role of the B4C and h-BN nanoparticles content on the mechanical and tribological properties of the aluminium composites was evaluated. This study presents the report on characterizion and evaluation of mechanical properties of h-BN and B4C nanoparticles reinforced aluminium composites. Design/methodology/approach: Al-B4C-h-BN composites are fabricated using stir and ultrasonic cavitation-assisted casting processes. The prepared composites are characterized using X-ray diffraction, Scanning Electron Microscopy and Energy Dispersive Spectroscopy. The dry sliding wear behaviour of the Al-B4C-h-BN composites are investigated using pin-on-disc wear test. Findings: The results of microstructural study reveal that uniform distribution, grain refinement and low porosity in composite specimens. The wear properties of the hybrid nanocomposites, containing 4 wt% B4C and 2 wt. % h-BN, exhibit the superior wear resistance properties as compared to unreinforced aluminium matrix. Practical implications: The interest in use of hexagonal boron nitride nanoparticles (h-BN) as solid nano lubricant for aluminium has been growing considerably due to its self lubricating properties.

Nanomodified cement-and sand concrete

Lukuttsova N., Pykin A., Kireyenkov D.

Budownictwo o Zoptymalizowanym Potencjale Energetycznym

2013

nr 2(12)

66--70

Physical and mechanical properties of cement- and sand concrete modified by nanodispersed admixture such as water suspension of schungite (Karelia, Russia) are investigated. Admixture was obtained by ultrasonic dispersion reduced to powder schungite in water in the presence of the stabilizer.

W artykule przedstawiono badania fizycznych i mechanicznych właściwości betonu cementowo-piaskowego modyfikowanego domieszkami nanodyspersyjnymi, jak na przykład wodna zawiesina szungitu (Karelia, Rosja). Domieszkę uzyskano poprzez ultradźwiękową dyspersję proszku szungitowego zredukowanego w wodzie w obecności stabilizatora.