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The result suggests that black shilajit, an Ayurvedic formulation, is safe for long term use as a dietary supplement for a number of disorders like iron deficiency anaemia.

The tribological properties are one of the most significant properties in many automobile components such as clutch plate, break shoe, engine liner, piston pin, etc. At present work, attempt on nano clay is loaded with natural fibers (sisal and jute), artificial fiber (E‐glass), and epoxy resin. In this investigation, the specific wear rate and coefficient of friction are analyzed by pin on disc apparatus under dry sliding conditions. The experiment design carried by Box–Behnken design on design of experiment techniques with influence wear parameters, namely, filler content, applied load, sliding distance, and sliding velocity; its responses are analyzed by response surface methodology. The regression mathematical models performed for all the responses, and the most influential factors determined by analysis of variance technique, S/N ratio. The results indicate that the coefficient of friction and specific wear rates are minimized with the addition of filler content to the developed composites and further increasing, the response of composites may be varied. Copyright © 2017 John Wiley & Sons, Ltd.

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Purpose -The purpose of this technical paper is to investigate the friction and wear behaviour of heat treated Al 6061 alloy and Al 6061 SiC-graphite particulate reinforced hybrid composites subjected to different ageing durations. Design/methodology/approach -The composites have been prepared by stir casting process with varying percentages of SiC and graphite particles. The cast 6061 alloy and its composites were subjected to solutionising treatment at a temperature of 803 K for 1 hr followed by quenching in water. The quenched samples were then subjected to artificial ageing for different durations of 4, 6, 8 hr at a temperature of 448 K. Tests were performed on heat treated Al 6061 alloy and its composites using pin-on-disc apparatus. Hardness measurements were also made on the specimens. The wear surfaces of the composites were analyzed using scanning electron microscopy. Findings -During wear test of specimens the wear resistance of the hybrid composites was found to increase with increase in ageing durations. The microscopic examination of the wear surfaces shows that the base alloy and composites wear primarily because of abrasion and delamination. The hardness result shows that the hardness of the composites increased with decreasing weight percentage of graphite particles. Originality/value -The content of this paper is fully research oriented and the finding from this investigation will be useful for society and also the automobile industries, especially in the making of brake drums.