influência das energias de superfícies e interfaces na densificação durante a sinterização: um modelo geométrico the influence of surface and interface energies during sintering: a geometric approach
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ID: 147939
2004
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Abstract
Devido a grande importância dada aos processos difusionais na sinterização, ou seja, a fatores cinéticos, pouco tem evoluído o conhecimento da sinterização no estado sólido do ponto de vista da energia do sistema de partículas. Alguns pesquisadores têm se esforçado em compreender a importância das energias da superfície dos poros e da interface do contorno de grão no processo de densificação e sua relação com os processos difusionais e a termodinâmica da sinterização. Contudo, pouco avanço tem sido obtido nesse sentido. O presente trabalho foi desenvolvido sobre um modelo geométrico simples de empacotamento de esferas sobre o qual foram realizados cálculos para se avaliar as variações de densidade, área específica dos poros e dos contornos de grão durante três situações: densificação sem crescimento de grãos, crescimento de grãos sem densificação e crescimento de grãos e densificação. Os resultados sugerem existir uma relação entre a evolução da microestrutura para a densificação ou não de um sistema de partículas em função da razão entre as energias do contorno de grão e da superfície dos poros.
Sintering is a diffusional process and the mechanism of mass transport is assumed to control the phenomenon. Minor attention has been paid on the influence of surface and interface energies during sintering. Even if some works have tried to understand the influence of the modifications of the pore and grain boundary surfaces in the densification during sintering and their relationships with the difusional process, modest progresses have been reached. This work was developed from a simple model of packing spheres, allowing for calculating simultaneously the variation of pore, grain boundary and density for three situations: densification without grain growth, grain growth without densification and grain growth with densification. The results suggest a relationship between the microestrutural evolution during sintering with or without densification and the ratio of the surface energies of the grain boundary and the pores.
Sintering is a diffusional process and the mechanism of mass transport is assumed to control the phenomenon. Minor attention has been paid on the influence of surface and interface energies during sintering. Even if some works have tried to understand the influence of the modifications of the pore and grain boundary surfaces in the densification during sintering and their relationships with the difusional process, modest progresses have been reached. This work was developed from a simple model of packing spheres, allowing for calculating simultaneously the variation of pore, grain boundary and density for three situations: densification without grain growth, grain growth without densification and grain growth with densification. The results suggest a relationship between the microestrutural evolution during sintering with or without densification and the ratio of the surface energies of the grain boundary and the pores.
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gouva2004cermicainfluncia
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| Authors | ;D. Gouvêa |
| Journal | Zootaxa |
| Year | 2004 |
| DOI |
10.1590/S0366-69132004000200003
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