Abstract
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.
Highlights
The primary destination of metallic biomaterials is in the orthopedic field for the manufacture of prostheses; implants to replace bone tissue and fastening devices
A strategy widely used is the 316L stainless steel (316L SS) coating applied with other materials, such as the calcium phosphate ceramics (CPCs) (Sing et al, 2016; Jenko et al, 2017; Kaita et al, 2018)
The proportion of the powders for the composite production was defined from other studies performed with the addition of β-tricalcium phosphate (TCP) and hydroxyapatite CPCs
Summary
The primary destination of metallic biomaterials is in the orthopedic field for the manufacture of prostheses; implants to replace bone tissue and fastening devices (the fastening devices are used to stabilize fractured bones while bone regeneration occurs). If the Young's modulus of the material used to manufacture an implant is much higher than the bone, the load support is not considered ideal. This can result in a mechanical isolation of the material, and the equilibrium of tension observed to induce the bone remodeling is hampered, occurring the loosening of the prosthesis (Rao et al, 2017; Bobbert et al, 2017, Kuffner et al, 2015). The 316L SS is a material that presents lower cost than the titaniumaluminum-vanadium and Co-Cr alloys It is accessible, which makes it a suitable material in the medical industry, especially for applications such as orthopedic implants. A strategy widely used is the 316L SS coating applied with other materials, such as the calcium phosphate ceramics (CPCs) (Sing et al, 2016; Jenko et al, 2017; Kaita et al, 2018)
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