Abstract
Ti6Al4V-HA composites have been recognized for their potential for biomedical implantation purposes. In the present study, Ti6Al4V-HA composites were fabricated by Powder Injection Molding (PIM) route. Ti6Al4V-HA feedstock at a ratio of 87:13 vol.% was prepared by using a binder system consisting of palm stearin (PS) and polyethylene (PE). The Critical Powder Volume Percentage (CPVP) value for Ti6Al4V-HA was 68 vol.%. Ti6Al4V-HA feedstock was developed at 66 vol.% powder loading. Ti6Al4V-HA feedstock showed pseudoplastic behaviour with a low viscosity and low activation energy of flow and was successfully injected into a tensile bar shape. The debinding process involved a solvent and thermal debinding operation. The debonded parts were sintered at 1300 °C, and the influence of the presintering stage on the physical and mechanical properties of the sintered parts was investigated. It was proven that the presintering stage was able to restrain the transformation of Ti6Al4V into Ti3Al (α2) as well as the decomposition of HA. These are key findings ideas for the designing of sintering parameters, where the decomposition of HA becoming the main problem in the sintering of Ti6Al4V-HA composites at a high temperature. The obtained results also showed that the sintered parts had a porous structure, which looked promising for their use in biomedical implantations. purposes.
Highlights
Accepted: 2 February 2021The development of biomaterial products has received huge attention in recent years.The usage and reliability of metals, ceramics and polymers as biomaterial products have been conducted by many researchers
The plasma-sprayed technique is not recommended for parts that have geometrical shapes [2]
The aim of the present work is to investigate the effect of the presintering stage, prior to the sintering of the Ti6Al4V-HA composite, on the physical properties and mechanical properties fabricated by the Powder Injection Molding (PIM) route
Summary
The development of biomaterial products has received huge attention in recent years. The usage and reliability of metals, ceramics and polymers as biomaterial products have been conducted by many researchers. In order to obtain the desired set of mechanical properties for biomedical products such as implants and instruments, the combination of metallic materials and ceramics have been receiving attention during these years, one objective of this being to improve the osseointegration properties of metallic materials. Hydroxyapatite (HA) is a calcium phosphate ceramic with the chemical formula Ca10 (PO4 ) OH2 ; it received great attention for improving the osseointegration properties of metallic materials. This is due to HA having excellent osteoconductive properties because HA has a similar chemical and crystallographic structure to human bone [7]. The aim of the present work is to investigate the effect of the presintering stage, prior to the sintering of the Ti6Al4V-HA composite, on the physical properties and mechanical properties fabricated by the PIM route
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