Microstructural and mechanical analysis of 316L SS/ β-TCP composites produced though the powder metallurgy route

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posted on 2018-10-10, 02:45 authored by Mônica Huguenin de Araújo Faria, Alexandre Nogueira Ottoboni Dias, Leonardo Albergaria Oliveira, Claudiney de Sales Pereira Mendonça, Bruna Horta Bastos Kuffner, Daniela Sachs, Gilbert Silva

Abstract The 316L stainless steel (316L SS) is one of the most used metallic materials for implants, due to its high mechanical properties and low cost. However, it is bioinert. One possibility to improve its biocompatibility is the production of a composite with b-tricalcium phosphate (β-TCP) addition. This study investigated the mechanical behavior of 316L SS/β-TCP composites through powder metallurgy. For this, used were 3 compositions, with 0 %, 5 % and 20 % of β-TCP. The compositions with 5% and 20% were milled during 10 hours with a mass/sphere ratio of 1:10 and 350 rpm. All compositions were uniaxially pressed with 619 MPa and sintered during 1 hour at 1100ºC. The microstructural and mechanical evaluations were performed through scanning electron microscopy, density and compressive strength. The results indicated that, by increasing the percentage of β-TCP in the compositions, the mechanical resistance decreases, as a consequence of its low load support.