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Home Georgian Technologies Corrosion resistant titanium alloys for medical tools and implants

Corrosion resistant titanium alloys for medical tools and implants

Description

The new corrosion resistant Ti-8N-Cr system alloys with increased mechanical properties are developed for medical instruments and implants based on study of Ti-8Ni alloys.

Optimum condition of thermal treatment, providing high strength, hardness and corrosion resistance of alloys has been defined – quenching from 9500C with content of chromium in alloys up to 1-3% (by the addition of Yttrium in quantity 0,001-0,01 mass %).

Study of Mechanical properties of quenching from 9500C alloys Ti-8Ni-(0-3)Cr show that chromium increases hardness (48 HRC) and tensile strength (1000 MPA), and slightly influences on plastic properties of Ti-8Ni alloy. Tensile strength of titanium standard alloys: Ti-6Al-4V and Ti-5Al-3Sn do not exceed 900 MPA.

Corrosion tests of Ti-8Ni-(0-3)Cr alloys in medium that contains the human body: blood, physiological solution (0,9% NaCl), gastric juice (1% HCl) and tissue liquid reveal high corrosion resistance, after 100 hour tests corrosion rate of all alloys, containing about 3% chromium did not exceed 0,0002 g/m2 hr. Corrosion testing of the Ti-8Ni-(0-3)Cr alloys has been carried out according to the following regime: cleaning+disinfection+sterilization. Washing solution “Ariel”+ 0,5% hydrogen peroxide was used as cleaning solution means. Disinfection was done in boiling distilled water during 45 minutes with addition of cooling.

For comparing titanium conventional alloys have been studied. The results after 20 cycle tests are given on the table. As it is seen corrosion losses of alloys Ti-8Ni-Cr increase insignificantly, though all alloys have high corrosion resistance. Visual control of alloys showed that known alloys withstand 10 cycle of cleaning without surface changing. Further the surface condition changes, spots of oxide tint appear; the surface of Ti-8Ni-(0-3)Cr alloys does not change after 20 cycles.

Preliminary study of toxic properties of developed alloys of Ti-8Ni-(1-3)Cr during their implantation show, that alloys do not cause local irritative actions on different tissues, they do not suppress local tissue reactions and do not have any toxic effects during implantation conditions.

Corrosion loses, Δm/s (g/m2), of alloys after 20 cycle of cleaning, disinfections and sterilization


Application of new corrosion resistant titanium alloys with increased mechanical properties in medical engineering will allow to improve functional properties and to increase quality, reliability, service life of medical tools and implants and consequently it will have significant social impact.


Fig.1 Ti-8Ni-Cr alloys samples

Innovative Aspect and Main Advantages

The high strength, low weight, outstanding corrosion resistance possessed by titanium and titanium alloys have led to a wide and diversified range of successful applications which demand high levels of reliable performance in surgery and medicine as well as in aerospace, automotive, chemical plant, power generation, oil and gas extraction, sports, and other major industries. More than 1000 tones of titanium devices of every description and function are implanted in patients worldwide every year. Requirements for joint replacement continue to grow. Light, strong and totally biocompatible, titanium is one of few materials that naturally match the requirements for implantation in the human body. Titanium and its alloys such as: unalloyed titanium (ASTM F1341, F67), Ti-6Al-4V (ASTM F620), Ti-4Al-3Mo-V, Ti-5Al-3Sn, Ti-3Al-1,5Mn etc. are used for manufacturing some medical tools like mirrors, wound wideners, nails for osseous integration, trachea metric tubes, needle holders, eye and wire fixation tweezers, heart valves and other micro tools. The most of commercial titanium alloys have low hardness and corrosion resistance in aggressive washing and sterilizing media. In this connection, the development of new titanium alloys with high mechanical properties together with corrosion resistance represents significant interest, both for manufacturing medical tools and implants and for coating them with the purpose of their hardening.

Areas of Application

Medical industry: medical devices, surgical instruments and implants.

Stage of Development

The development is situated in the stage of a study the toxic properties of new Ti-8Ni-(1-3)Cr alloys in the framework of STCU Project 3575

Contact Details

Dr. Manana Mikaberidze
Organization: Institute of Metallurgy and Materials Sciences
Address: 15 Kazbegi Av., Tbilisi 0160, Georgia
+(995 32) 375562
This e-mail address is being protected from spambots. You need JavaScript enabled to view it

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