Porous Ceramics
Mostrando 13-24 de 31 artigos, teses e dissertações.
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13. Estudo por espectroscopia micro-Raman dos mecanismos de separação de fase em vidros fosfatos de metais de transição
Glass-ceramics are prepared by controlled separation of crystal phases in glasses, leading to uniform and dense grain structures. On the other hand, chemical leaching of soluble crystal phases yields porous glass-ceramics with important applications. Here, glass/ceramic interfaces of niobo-, vanado- and titano-phosphate glasses were studied by micro-Raman sp
Química Nova. Publicado em: 2009
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14. SYNTHESIS AND CERAMIC PROCESSING OF ALUMINA AND ZIRCONIA BASED COMPOSITES INFILTRATED WITH GLASS PHASE FOR DENTAL APPLICATIONS / Síntese e processamento de compósitos á base de alumina e zircônia com infiltração de fase vítrea para aplicações odontológicas
The interest for the use of ceramic materials for dental applications started due to the good aesthetic appearance promoted by the similarity to natural teeth. However, the fragility of traditional ceramics was a limitation for their use in stress conditions. The development of alumina and zirconia based materials, that associate aesthetic results, biocompat
Publicado em: 2009
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15. Dinâmica da impregnação a vácuo em meios porosos
Vacuum impregnation technology (VI) is a process that consists of removing internal air of a porous medium, through the application of vacuum in a hermetic container with the sample immersed in an impregnating solution, followed the recovery of the atmospheric pressure, leading to the solution penetratation into the sample porous space. In food processing, V
Publicado em: 2009
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16. Obtenção e caracterização de espumas cerâmicas de alumina para uso como queimadores radiantes
Ceramic foams are cellular porous ceramics that can be produce by different methods, like replica method, sacrificial template method and direct foaming method. Foams are a type of porous ceramic which present many properties making them a very versatile material, used in different applications, like radiant porous burners. Radiant burners consist of ceramic
Publicado em: 2009
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17. Development of Porous Silicon Nitride-Based Ceramics / Desenvolvimento de cerâmicas porosas à base de Nitreto de Silício
Cerâmicas porosas à base de nitreto de silício vêm sendo amplamente estudadas por possibilitarem a obtenção de corpos que aliam porosidade e resistência mecânica. Isto se deve, principalmente ao característico mecanismo de reforço in-situ que o material apresenta, obtido com o crescimento anisotrópico de grãos de Si3N4. Neste estudo foram obtidos
Publicado em: 2009
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18. Micro-morphological changes prior to adhesive bonding: high-alumina and glassy-matrix ceramics
The aim of this study was to qualitatively demonstrate surface micro-morphological changes after the employment of different surface conditioning methods on high-alumina and glassy-matrix dental ceramics. Three disc-shaped high-alumina specimens (In-Ceram Alumina, INC) and 4 glassy-matrix ceramic specimens (Vitadur Alpha, V) (diameter: 5 mm and height: 5 mm)
Brazilian Oral Research. Publicado em: 2008-06
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19. Compósitos cerâmicos porosos de alumina - zircônia para aplicação em sistemas de controle térmico para satélites: obtenção e caracterização / Alumina-zirconia porous ceramic composites for application in satellite thermal control systems: obtaining and characterization
To control the temperature of satellites are used various thermal control heat systems. The Loop Heat pipe (LHP) are being developed at the DEM (Space Mechanic and Control Division) of the INPE (National Institute for Space Research) an apparatus for passive heat control of the satellites components. The main components of the LHP system are: capillary evapo
Publicado em: 2008
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20. Caracterização de cerâmicas porosas de alumina reforçada com zircônia produzidas pelo método da réplica
Porous ceramics have many applications: thermal insulation, catalytic support, materials to fire protection, filters, and others. There are many techniques to production of ceramic filters. One technique to obtain ceramic filters is the replication method. This method consists in the impregnation of polymeric foam with ceramic slurry followed by a heating tr
Publicado em: 2008
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21. Formulação e caracterização de matérias-primas para revestimento cerâmico Semi-Poroso com adição de chamote de telhas / Formulation and characterization of raw materials for Semiporous ceramic coating and roofing tile Chamote
The ceramics industry in Piauí is nowadays with 55 industries where 11 are in Teresina which is the mainstream of the state, producing 55 million shingles; in which 10 % is of this production is wasted being sometimes thrown on the margins of rivers, roads and highways provoking an environmental degradation. The main goal of this work is to verify the poten
Publicado em: 2008
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22. A study of the consolidation method with albumin to obtain porous beta-TCP ceramics
In many 'in-vivo' and 'in-vitro' studies, the behavior of calcium phosphate ceramics like beta - tricalcium phosphate in biological environments has been reported to be predictive and positive. In terms of bone tissue growth, these ceramics are attractive biomaterials due to their porous microstructures. To obtain biomaterial quality ceramics, in this invest
Materials Research. Publicado em: 2007-09
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23. Evaluation of the thermal comfort of ceramic floor tiles
In places where people are bare feet, the thermal sensation of cold or hot depends on the environmental conditions and material properties including its microstructure and crustiness surface. The uncomforting can be characterized by heated floor surfaces in external environments which are exposed to sun radiation (swimming polls areas) or by cold floor surfa
Materials Research. Publicado em: 2007-09
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24. Characterization of calcium phosphate coating and zinc incorporation on the porous alumina scaffolds
Bone ingrowth requires materials with the existence of open and interconnected pores with diameters larger than 150 µm for proper circulation of nutrients. Such materials must possess enough mechanical strength to avoid failure whilst offering a bioactive surface for bone regeneration. We have developed porous ceramic alumina scaffold with compressive stren
Materials Research. Publicado em: 2007-03