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Ould C.,MINES ParisTech | Badiche X.,HEF R and D andrezieux Boutheon | Montmitonnet P.,MINES ParisTech | Gachon Y.,HEF R and D andrezieux Boutheon
Transactions of the North American Manufacturing Research Institution of SME | Year: 2012

The cost of rolling is determined in particular by productivity and lifetime of rolls before regrinding. Adhesive wear of the sheet gives rise to transfer on the roll surface. Its occurrence depends on rolling conditions and is one of the determining factors of the maximal reduction for a given rolling speed. Abrasive wear of the roll is the second factor for roll lifetime. Both phenomena are strongly related to tribological and mechanical characteristics of the surface layer of rolls. Stainless steel is known for its high adhesiveness. Coatings with good tribological properties could help extend the roll service. In this paper, the potential of different PVD coatings (CrN, TiN and TiBN) is explored. The impact of these coatings on influential phenomena during rolling is analysed thanks to well adapted tribological and mechanical laboratory tests. The results show that TiN has a good potential in cold rolling of stainless steel strips.

Briston K.J.,University of Sheffield | Martin J.-M.,École Centrale Lyon | Heau C.,HEF R and D andrezieux Boutheon | Martin M.,HEF R and D andrezieux Boutheon | Inkson B.J.,University of Sheffield
Nanotechnology | Year: 2012

Nanoporous carbon nanospheres <150nm in diameter have been fabricated for the first time by the transformation of amorphous carbon nanospheres under Joule heating. The process, initiated by current densities of 1.5-8×10 10Am 2, has been imaged in real time insitu in a transmission electron microscope. Significant atomic diffusion and carbon ordering results in the formation of a 3D network of buckled graphitic sheets bounding interlinked <5nm diameter pores, with greatly enhanced conductivity. Porous carbon nanospheres offer new opportunities for biocompatible drug delivery, catalysis and energy storage. © 2012 IOP Publishing Ltd.

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