ROSA MARIA DA ROCHA
10 resultados
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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 18483 Fases nanocristalinas de cerâmica derivada da pirólise de polímero e carga2012 - 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 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.Artigo IPEN-doc 09689 Development and characterisation of Si-Al-O-N-C ceramic composites from polysiloxane-filler mixtures2003 - ROCHA, R.M.; GREIL, P.; BRESSIANI, J.C.; BRESSIANI, A.H.A.Artigo IPEN-doc 14850 Effect of electron beam radiation dose on the foam formation in pre-ceramic polymer2010 - ROCHA, ROSA M. da; MOURA, ESPERIDIANA A.B.; BRESSIANI, JOSE C.; BRESSIANI, ANA H.A.