Abstract
The objective of this work was to use tungsten and lignin as precursors to obtain a metal-organic composite tungsten-lignin (W-Lig) using different sintering temperatures. Tungsten is a refractory metal and it was selected for the composite since it is widely used for high-energy radiation shielding as it has an excellent absorption cross section for thermal neutrons. Lignin extracted from lignocelluloses biomass and it was selected to be the organic precursor for the composite due to its multiple applications. Analysis of the composite was performed after sintering processes, using a 3D optical surface profiler and measurement of the gamma radiation attenuation coefficient using cobalt source (Co-60). Metal-organic composites in ratios of W2.5%Lig and W5%Lig (in mass % of lignin) were used. The gradient of the attenuation coefficient differed when standard tungsten and the composites of W2.5%Lig and W5%Lig were compared. Therefore, the attenuation coefficient between unobstructed free radiation and the W5%Lig 90 oC composite showed a gradient of about 43% in the two characteristic Co-60 energy peaks, with a sample thickness of 0.679 cm the calculated linear attenuation coefficient was 0.832 cm-1.
Highlights
Numerous materials are of interest as possible components of new composites due to their wide application in various sectors such as transportation, civil construction, automotive, naval, aerospace and nuclear
The presence of lignin decreases the sample porosity as temperature increases, i.e., there is a densification of the composite meaning that the distribution of the lignin surrounding the tungsten powder particles surface improves, increasing the absorption cross section and justifying the higher attenuation coefficient
The present work to obtain of a metallic-organic composite using tungsten powder and lignin, showed promising results, the samples W2.5%Lig and W5%Lig presented good homogeneity and absence of degradation when sintered at temperatures up to 90 oC, considering that lignin is an organic substance
Summary
Numerous materials are of interest as possible components of new composites due to their wide application in various sectors such as transportation, civil construction, automotive, naval, aerospace and nuclear. The objective of this work was to obtain a polymer matrix composite using lignin and a metal as filler, the tungsten powder, in the ratios of W5%Lig and W2.5%Lig (in mass% of lignin) at different sintering temperatures and to analyze the gamma radiation attenuation coefficient. This may contribute directly in the minimization environmental impact considering that lignin is a residue of cellulose[7,8]
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