METHOD FOR OBTAINING A BIODEGRADABLE IRON-BASED ALLOY WITH A SHAPE MEMORY EFFECT FOR THE MANUFACTURE OF BONE IMPLANTS Russian patent published in 2022 - IPC C22C33/04 C22C38/04 C21D8/00 A61L27/04 

FIELD: medical technology.

SUBSTANCE: invention relates to biomedical materials science, namely to the creation of biodegradable iron-based alloys of the Fe-Mn-Si system with shape memory effect, which are intended for use as temporary bone implants in traumatology, orthopedics and maxillofacial surgery. The method for producing the alloy includes a five-fold remelting of the initial charge materials of the Fe-30Mn-5Si alloy, wt. %, conducted at a vacuum of 10^-3 Pa, an arc voltage between a non-consumable tungsten electrode and a crystallizer from 24 to 30 V and at a current from 2000 to 2200 A. The duration of each remelting is from 45 to 60 seconds. Then heat treatment is carried out in the form of homogenization annealing at 900°C for 60 minutes and thermomechanical treatment in the form of hot rolling at 600°C or 800°C with a true degree of deformation e=0.3. These thermal and thermomechanical treatments are completed by quenching in water.

EFFECT: alloy with increased values of yield stress, tensile strength and fatigue life is obtained both in air and in Hanks’ corrosion-electrochemical solution, as well as by reducing Young’s modulus and providing the necessary temperatures for the beginning of direct martensitic transformation and the required rate of biodegradation of the alloy.

1 cl, 2 ex