Rapid manufacturing of polyethylene parts with controlled pore size gradients using selective laser sintering

• Main Authors: Gean Vitor Salmoria, Carlos Henrique Ahrens, Pricila Klauss, Rodrigo Acacio Paggi, Rafael Galet Oliveira, Alexandre Lago
• Format: Article
• Language: English
• Published: Associação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímeros (ABPol) 2007-06-01
• Series: Materials Research
• Subjects: HDPE parts; pore gradients; selective laser sintering
• Online Access: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392007000200019

In this study HDPE specimens were fabricated by selective laser sintering using different particle sizes to obtain controlled variations in the porosity. Electron microscopy, density measurements and mechanical analyses were conducted for the characterization of the specimens. Parts with controlled pore gradients were also manufactured and characterized. The specimens with larger particle sizes had a high sintering degree and a significant level of close pores, as shown by microscopy and density analyses. However, the mechanical properties of specimens prepared with large particles had low values due to the limited density of union points, i.e., low neck number/area. HDPE parts with pore gradients were prepared by selective laser sintering demonstrating that this technique can be used to easily control the structure and the properties of the parts manufactured. This technology may have applications in areas such as drug delivery devices and scaffolds for tissue engineering.