Medida de Porosidade em Compósitos B4C-Nb por Meio de Análise e Processamento Digital de Imagem

Marcos Paulo Dornellas; Vinicio  Coelho da Silva; Getúlio  da Silva Abreu; Geronimo  Perez; Marcello  Filgueira; Marília  Garcia Diniz

doi:10.14295/vetor.v32i1.13687

Authors

Marcos Paulo Dornellas Universidade do Estado do Rio de Janeiro
Vinicio Coelho da Silva Universidade do Estado do Rio de Janeiro
Getúlio da Silva Abreu Universidade Estadual do Norte Fluminense
Geronimo Perez Universidade Federal Fluminense
Marcello Filgueira Universidade Estadual do Norte Fluminense
Marília Garcia Diniz Universidade do Estado do Rio de Janeiro

DOI:

https://doi.org/10.14295/vetor.v32i1.13687

Keywords:

Advanced ceramics, Boron carbide with niobium, Porosity, Digital image processing

Abstract

Constant research efforts have been conducted in materials selection to combine and improve the properties of interest, service life and production cost. In this context, boron carbide (B₄C) stands out for having a high mechanical performance, being the material that has the fourth highest hardness (> 29.1GPa) among ceramic materials. However, porosity is seen as a limiting factor for the high performance of this group of materials, to which boron carbide is found. Porosity control is usually conducted through imprecise techniques, and indirect or costly measures for quantification. This work quantified the porosity of boron-niobium carbide (B₄C-Nb) composites obtained from high pressure - high temperature (HPHT - high pressure high temperature) sintering process through analysis and digital image processing (PDI) by microscopy optical (MO) after surface preparation with controlled and automated parameters. The results obtained were compared with those obtained using the mercury intrusion porosimetry method. The semi-quantitative chemical characterization of the composites was performed using the Energy Dispersive Spectroscopy (EDS) technique.

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