VALERIA DE SA GONCALVES
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Artigo IPEN-doc 12489 Mechanical activation of Nb75Al powder mixtures with different process control agents2007 - GONCALVES, V.S.; ROCHA, C.J.; LEAL NETO, R.M.Artigo IPEN-doc 10100 Combustion synthesis of mechanically-activated Nb-Al mixtures2003 - BURACOVAS, F.; GONCALVES, V.S.; ROCHA, C.J.; LEAL NETO, R.M.Artigo IPEN-doc 10094 Sintese por combustao mecanicamente ativada de misturas Nb-Al2002 - BURACOVAS, F.; GONCALVES, V.S.; CARVALHO, L.L.; ROCHA, C.J.; LEAL NETO, R.M.Artigo IPEN-doc 10078 Influencia da midia de moagem nas caracteristicas e misturas Nb75Al mecanicamente ativadas2002 - ROCHA, C.J.; GONCALVES, V.S.; BURACOVAS, F.; LEAL NETO, R.M.Artigo IPEN-doc 08140 An investigation of the use of stearic acid as a process control agent in high-energy ball milling of Nb-Al and Ni-Al powder mixtures2001 - ROCHA, C.J.; LEAL NETO, R.M.; GONCALVES, V.S.; CARVALHO, L.L.; AMBROZIO FILHO, F.High energy ball milling of powders involves successive events of fracture and welding promoting mechanical alloying, fine and homogeneous dispersions could be attained. To minimize excessive cold welding during milling of ductile particles, the so called process control agents (PCAs) are added to the powder charges. These additives, mostly organic compounds, act as a coating of the particles inhibiting welding. It is known that PCAs are a source of contamination, so under this point of view its quantity much be the lowest possible. Moreover performing combustion synthesis of a powder mixture with PCA requires a pretreatment during the heating for extracting the PCA before reaction takes place, otherwise it can impair densification. In this work the use of stearic acid as PCA in milling Nb-Al and Ni-Al powder mixtures was investigated. The aim was to find a optimum quantity of that additive concerning milling action and decreased contamination.Artigo IPEN-doc 09701 An investigation of the use of stearic acid as a process control agent in high-energy ball milling of Nb-Al and Ni-Al powder mixtures2003 - ROCHA, C.J.; LEAL NETO, R.M.; GONCALVES, V.S.; CARVALHO, L.L.; AMBROZIO FILHO, F.Artigo IPEN-doc 14472 Mechanical activation of Nb75Al powder mixtures with different process control agents2008 - GONCALVES, V.S.; ROCHA, C.J.; LEAL NETO, R.M.