Actas de congresos
Surface study of vitreous carbon obtained from glassy carbon powder
Materials Research Society Symposium Proceedings, v. 1373, p. 25-30.
Universidade Estadual Paulista (UNESP)
This work presents a surface study of monolithic vitreous (or glassy) carbon - MVC - obtained from vitreous carbon powder. Defective MVC pieces are crushed in a ball mill and size classified by sifting. The MVC powder is mixed with furfuryl-alcohol resin and compacted in a mould using a hydraulic press. Samples with different powder granulometries are produced in this way and carbonized in a furnace under nitrogen atmosphere. Complete carbonization of the powder is achieved in only one day and losses due to breakage of the pieces is less than 5%. These results compare very favorably with respect to traditional MVC production methods where full carbonization may require up to seven days and losses due to breakage can be as high as 70%. After carbonization, samples are sanded and polished. Surface roughness and microstructure are characterized by light microscopy. Porosity is quantified from micrographs using ImageJ software and nanometric height variations are measured by atomic force microscopy. © 2012 Materials Research Society.
Showing items related by title, author, creator and subject.
Synthetically useful carbon-carbon and carbon-sulphur bond constructions mediated by carbon- and sulphur-centred radicals in water and aqueous media Postigo, Jose Alberto (Royal Society of Chemistry, 2011-07)This account is focused on carbon-carbon, and carbon-sulphur bond-forming reactions through the use of carbon- and sulphur-centred radicals in water, respectively. It intends to show the scope and applications on these ...
Reemplazo del carbón bituminoso (carbón importado) por carbón subbituminoso (carbón nacional) en los hornos de cemento Romero Macha, Joel William; Romero Macha, Joel William