Browsing by Keyword "Chromium carbide"
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Item Graphite-nimonic alloy brazing(2009) Moutis, N. V.; Jimenez, C.; Speliotis, T.; Azpiroz, X.; Mergia, K.; EXTREMATA graphite sheet has been successfully brazed to a Nimonic 105 superalloy using a commercial TiCuSil paste. A chromium layer was deposited on the graphite surface by sputtering and controlled heat treatments were employed in order to develop a suitable microstructure. Scanning electron microscopy measurements showed rough, crack-free interfaces between the filler metal and both the graphite and nimonic parts. From metallographic examination a well defined layered structure of the metallic elements close to the filler/graphite interface has been found. The metallic elements transport from the interface to the carbon bulk where they fill all the graphite pores up to a depth up of 50 μrn and form a layered structure within the pores.Item Multilayer coatings by continuous detonation system spray technique(1998-04-01) Fagoaga, I.; Viviente, J. L.; Gavin, P.; Bronte, J. M.; Garcia, J.; Tagle, J. A.; EXTREMAT; TECNOLOGÍA DE MEMBRANAS E INTENSIFICACIÓN DE PROCESOSSurface protection of high-temperature components for power generation has become one of the most advanced fields of modern engineering. In this area, a multilayer coating of chromium oxide/chromium carbide for erosion-corrosion protection of furnace boiler-walls has been produced by thermal spray continuous detonation system (CDS) technique. These composite coatings present a microstructure made by alternate phases of chromium carbide cermet and oxides resulting from preferential oxidation of chromium compounds. Mechanisms for the generation of such mixed structure are discussed. Produced coatings have been characterized by electron probe microanalysis, X-ray diffraction and ultramicrohardness techniques, combined with traditional procedures of metallographic preparation, quantitative image analysis, and microhardness testing.