ROSA MARIA DA ROCHA
17 resultados
Resultados de Busca
Agora exibindo 1 - 10 de 17
Resumo IPEN-doc 16300 Effects of electron beam radiation doses on the foam formation in pre-ceramic polymer2008 - ROCHA, R.M.; MOURA, E.A.B.; BRESSIANI, J.C.; BRESSIANI, A.H.A.Resumo IPEN-doc 10360 Lasers in caries diagnosis and prevention2005 - ZEZELL, D.M.; ANA, P.A.; RIBEIRO, A.C.; FREITAS, A.Z.; ROCHA, R.M.; OLIVEIRA, M.E.; BACHMANN, L.Resumo IPEN-doc 08881 Aplicacao de radiacao ionizante em misturas de polissiloxano-carga ativa para obtencao de compositos ceramicos2002 - ROCHA, R.M.; MOURA, E.A.B.; MORI, M.N.; BRESSIANI, J.C.; BRESSIANI, A.H.A.Resumo IPEN-doc 08174 Evolucao da microestrutura de compositos de Al2O3:NbC2000 - ROCHA, R.M.; ACCHAR, W.; MARTINELLI, A.E.; GREIL, P.; BRESSIANI, J.C.Resumo IPEN-doc 08166 Ceramic tape preparation by filler controlled polymer pyrolysis2000 - ROCHA, R.M.; BRESSIANI, J.C.; SCHEFFLER, M.; GREIL, P.; BRESSIANI, A.H.A.Artigo IPEN-doc 10534 Propriedades termicas de ceramicas obtidas da pirolise de misturas de polissiloxano e cargas2004 - ROCHA, R.M.; BRESSIANI, J.C.; BRESSIANI, A.H.A.Artigo IPEN-doc 09528 Espumas ceramicas obtidas a partir da pirolise de polissiloxano e carga ativa de Al e Si2003 - ROCHA, R.M.; MOURA, E.A.B.; BRESSIANI, J.C.; BRESSIANI, A.H.A.Artigo IPEN-doc 13261 Obtencao de compositos ceramicos a partir de misturas de alumina e polissilsesquioxano2008 - MACHADO, G.A.F.; ROCHA, R.M.; BRESSIANI, J.C.; BRESSIANI, A.H.A.Artigo IPEN-doc 10101 Complex shaped ceramic composites by machining compact polymer-filter mixture2003 - ROCHA, R.M.; GREIL, P.; BRESSIANI, J.C.; BRESSIANI, A.H.A.Research into the preparation of ceramics from polymeric precursors is giving rise to a great interest in ceramic technology because it allows the use of several attractive polymer forming techniques. In this work ceramic composites pieces were obtained by pyrolysis of compacted mixture of"a polissiloxane resin and alumina/ silicon powder. The mixture consists of 60 vol% of the polymer and 40 vol% of the filler in a ratio of 1:1" for alumina/silicon, which was thermally pressed to crosslinking the polymer, thus forming a compact body. This green body was trimmed into different geometries and pyrolised in nitrogem atmosphere at temperatures up to 1600 'C. X ray analysis showed crystalline phases such as mullite and Si2ON2 resulting from the reaction during pyrolysis. The porosity was found to be lower than 20% and the mass loss around 10%. The complex geometry was mantained after pyrolysis and shrinkage was aproximatelly 8%, proving to be an atractive process to form near-net-shape bulk ceramic components.Artigo IPEN-doc 10085 Obtencao de espumas ceramicas no sistema Si-Al-O-C-N a partir de polissiloxano irradiado com feixe de eletrons2002 - ROCHA, R.M.; MOURA, E.A.B.; MORI, M.N.; BRESSIANI, J.C.; BRESSIANI, A.H.A.