THE TECHNOLOGY OF PRODUCING AND CERTIFICATION OF Ti-Nb-Zr ALLOYS PERMEABLE FOAM MATERIALS OF MEDICAL PURPOSE


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Abstract

High requirements for biochemical and biomechanical compatibility are applied to the promising alloys to be used as materials for intraosseous implants. Among other things, it involves a number of properties ensuring the accelerated and smooth process of implantation into the bone tissue, as well as its reliable fixation and prevention of implant rejection. Favorable mechanical behavior can be achieved due to the similarity of mechanical properties of an implant and the bone tissue. During the deformation, the bone tissue manifests the mechanical hysteresis. Among the metallic materials, superelastic shape memory Ti-20.8Nb-5.5Zr (in at. %) alloy demonstrates the similar mechanical behavior. However, the higher Young’s modulus of this alloy ensures its biomechanical compatibility insufficiently. Due to the creation of a porous structure, it is possible to decrease radically Young’s modulus. For this purpose, a powder with spherical particles of less than 50 μm in size was produced from the ingot of this composition. Then the powder was uniformly mixed with the blowing agent – the polymethylmethacrylate powder (PMMA) in the form of spherical particles no greater than 250 μm. The mixture of powders was subjected to the double-action compacting and subsequent pyrolysis. In the pyrolysis process, the polymer component was decomposed into gaseous components. As the result of pyrolysis, a porous semi-product was produced from the metallic powder with pores. To strengthen metal particles bonds, the sintering was performed. The final porosity was achieved in the samples by varying the volume ratio of the blowing agent.

It is established that the pre-defined porosity is close to the resulting porosity and the pores are distributed homogeneously within the volume. When increasing the porosity, Young’s modulus decreases, the permeability coefficient increases, and the strength characteristics decrease. At the same time, the calculated mechanical characteristics of samples of various porosities remain within the permissible limits of biomechanical compatibility.

About the authors

Alibek Magaramovich Kazakbiev

National University of Science and Technology “MISiS”, Moscow

Author for correspondence.
Email: kazakbiev@yandex.ru

postgraduate student

Russian Federation

Anastasia Anatolievna Korobkova

National University of Science and Technology “MISiS”, Moscow

Email: nastyakorobkova@gmail.com

postgraduate student

Russian Federation

Vadim Alekseevich Sheremetyev

National University of Science and Technology “MISiS”, Moscow

Email: vadim.sheremetyev@gmail.com

PhD (Engineering), researcher

Russian Federation

Sergey Mikhailovich Dubinskiy

National University of Science and Technology “MISiS”, Moscow

Email: sdubinskiy@gmail.com

PhD (Engineering), Associate Professor

Russian Federation

Sergey Dmitrievich Prokoshkin

National University of Science and Technology “MISiS”, Moscow

Email: prokoshkin@tmo.misis.ru

Doctor of Sciences (Physics and Mathematics), Professor, chief researcher

Russian Federation

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