Assessment of the biological performance of a Ti-6Al-4V/Ti double layer structure created through spark plasma sintering.
Subject Areas : journal of New MaterialsAlireza Sharifi 1 , Sahar Mollazadeh Beidokhti 2 , Jalil Vahdati Khaki 3
1 -
2 - Department of materials engineering, Iran University of Technology
3 - Ferdowsi University of Mashhad, Mashhad, Iran
Keywords: Titanium, porosity, spark plasma sintering, double layer structure, biological properties.,
Abstract :
Nowadays, the replacement of damaged tissue with implants is inevitable. The most important materials for creating implants are metals with high deformability and exceptional mechanical properties. However, the high Young's modulus of metallic materials leads to a stress shield effect. It is necessary, therefore, to design the implant structure in a way that, in addition to maintaining other mechanical properties, it also features a modified Young's modulus. In this study, a two-layer structure (Ti-6Al-4V/Ti) was designed and manufactured so that the alloy core maintains mechanical properties, including compressive strength, while the shell reduces Young's modulus due to its porous structure. Irregularly shaped metal powder particles and the spark plasma sintering method were utilized to create porosity in the final sample at a working temperature of 900 °C and a baking time of 7 minutes. After the baking process, the results show a gradual change in the microstructure due to the allotropic transformation of titanium in areas near the interface. The core/shell interface was effectively filled by powder particles from both regions, resulting in a gradual change in composition. The residual porosity in the shell region was significantly higher than in the core . After the sample was stored for thirty days in a biomimetic solution, the concentration of ions in the medium decreased, leading to the formation of calcium-phosphate particles on the sample's surface. The pores in the structure were identified as suitable sites for the formation of calcium-phosphate particles.
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