ROSA MARIA DA ROCHA
12 resultados
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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 18145 Obtenção de compósitos de Bsub(4)C-TiBsub(2)a partir de TiOsub(2)2011 - ROCHA, R.M.; MELO, F.C.L.; USSUI, V.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 08158 Estudos de densificacao do composito Alsub(2)Osub(3).Ysub(2)Osub(3).NbC2000 - RUMBAO, A.H.; ROCHA, R.M.; BRESSIANI, J.C.; BRESSIANI, A.H.A.Artigo IPEN-doc 08183 Sintering behaviour of the Alsub(2)Osub(3)-NbC composites with Ysub(2)Osub(3) addition1999 - ROCHA, R.M.; BRESSIANI, J.C.; BRESSIANI, A.H.A.Artigo IPEN-doc 08128 Development and characterisation of Si-Al-O-N-C ceramic composites from polysiloxane-filler mixtures2001 - ROCHA, R.M.; GREIL, P.; BRESSIANI, J.C.; BRESSIANI, A.H.A.Artigo IPEN-doc 20118 Ceramic substrates of ' Beta"-SiC/SiAlON composite from preceramic polymers and Al-Si fillers2014 - ROCHA, R.M.; BRESSIANI, J.C.; BRESSIANI, A.H.A.Artigo IPEN-doc 08208 Sintering behavior of the Alsub(2)Osub(3)-NbC composites with Ysub(2)Osub(3) addition2001 - ROCHA, R.M.; BRESSIANI, J.C.; BRESSIANI, A.H.A.