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In-situ synthesis of functionally graded Ti-based matrix composites by low-cost liquid metallurgical route

Grant number: 19/07953-0
Support type:Scholarships abroad - Research Internship - Doctorate (Direct)
Effective date (Start): September 01, 2019
Effective date (End): August 31, 2020
Field of knowledge:Engineering - Materials and Metallurgical Engineering
Principal Investigator:Luís Augusto Sousa Marques da Rocha
Grantee:Vinícius Richieri Manso Gonçalves
Supervisor abroad: Fatih Toptan
Home Institution: Faculdade de Ciências (FC). Universidade Estadual Paulista (UNESP). Campus de Bauru. Bauru , SP, Brazil
Local de pesquisa : Universidade do Minho (UMinho), Portugal  
Associated to the scholarship:18/00746-6 - Development and characterization of functionally graded composites for biomedical applications: Ti-Nb matrix with ceramic particles reinforcement, BP.DD


Total hip arthroplasty has become more and more a common surgery mainly due to the ageing population. As a result, the development of new materials for this type of prosthesis is an issue of extreme importance, aiming at greater durability and efficiency. Currently, the hip prosthesis is modular, divided into four components. One of these components is the femoral stem, commonly made of titanium-based materials. The friction that occurs in a corrosive environment, in the region of union between the stem and the femoral head, became a concern in last years. Solution for this problem may be achieved by the manufacturing of a functionally graded composite, in order to obtain higher wear resistance for the stem in the region of union with the femoral head. Thus, the present work aims to apply an innovative low-cost technique for the production of functionally graded metal matrix bio-composites (bio-FGMMCs). It is intended to apply centrifugal casting to infiltrate metal molten into a functionally graded preform that will be graded by powder stacking and processed by powder metallurgy with space holder technique. In this case, for achieving the required properties, a titanium-niobium alloy was chosen as metal matrix to obtain high corrosion resistance and low elastic modulus. At same time, in-situ formation of hard ceramic reinforcements will be able to increase the wear resistance. Therefore, the challenge will be to understand the electrochemical, tribo-electrochemical, and mechanical behavior of these metal matrix bio-composites (bio-MMCs) as a function of the reinforcement type and volume fraction, and eventually to design and process a bio-FGMMC according to the obtained experimental data.