WILSON ACCHAR
33 resultados
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Artigo IPEN-doc 23921 Yttria nettings by replica processing2014 - SANTOS, S.C.; YAMAGATA, C.; ACCHAR, W.; MELLO-CASTANHO, S.R.H.In the context of green economy supported and widespread by United Nations (UN), the renewable energy sources are the unique mechanism to universalize the access to energy. Face to this strategic direction of change is essential to develop efficient components for saving energy such as porous ceramics that associate light with mechanical strength. Thus, the objective of this work concerns to improve the homogeneity of porous size distribution of yttria porous ceramics by evaluating their morphology during replica processing. Samples were subject to immersion into 30vol% yttria aqueous suspensions during an interval from 1min to 120min and sintered through careful thermal conditions. Based on the results, the weight and morphology of porous structure samples were directly influenced by immersion time, whereby intervals from 30-120min showed the best final products.Artigo IPEN-doc 20337 Processamento coloidal de dissilicato de ítrio2014 - SANTOS, S.C.; ACCHAR, W.; SILVA, A.C.; YAMAGATA, C.; MELLO CASTANHO, S.R.H.Artigo IPEN-doc 20305 Caracterização da paligorskita para possível aplicação como suporte de catalisadores2014 - PARRA-SILVA, J.; SILVA, A.C.; ACCHAR, W.; MELLO CASTANHO, S.R.H.Resumo IPEN-doc 07591 Obtencao do composito Alsub(2)Osub(3)-NbC: resultados preliminares1998 - ACCHAR, W.; BRESSIANI, J.C.; BRESSIANI, A.H.A.; GOMES, U.U.; VIEIRA, F.A.Resumo IPEN-doc 08535 Tenacidade a fratura de compositos de alumina reforcados com carbeto de niobio1999 - ACCHAR, W.; BRESSIANI, J.C.; BRESSIANI, A.H.A.; CAIRO, C.A.Resumo IPEN-doc 09029 Microstructural study of SiC-platelet/silicon nitride ceramic composites1998 - ACCHAR, W.; GOMES, U.U.; 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 08165 On the formation of niobium carbide ceramics2000 - BRESSIANI, A.H.A.; BRESSIANI, J.C.; ACCHAR, W.; SCHEFFLER, M.; GREIL, P.Resumo IPEN-doc 18477 Estudo das propriedades termo-mecânicas da cromita de lantânio dopada com estrôncio e cobalto2012 - ACCHAR, W.; SOUSA, C.R.C.; MELLO CASTANHO, S.R.Resumo IPEN-doc 18429 Estudo das propriedades físico-mecânicas da LaCrO3 dopada com Sr e Co2012 - SOUSA, C.R.C.; ACCHAR, W.; SILVA, L.B.; LIMA, P.H.S.; CASTANHO, S.R.H.M.