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Scientists from the National University of Science and Technology of Russia MISIS (NUST MISIS) together with their Russian and foreign colleagues have been able to increase the technology of obtaining medical relations with memory of form.
According to the scientists, the new method will allow to increase the security of existing and surgical chiropractic teams. The results of the recent investigation were published in the JOM review.
The relations with the shape memory (SMA, by its seals in English) are materials capable of recovering its shape after having been deformed. According to the scientists of the NUST MISIS, with these fines are used by the mayor frequently the SMA intermetallic bases based on the composition of nickel and titanium (NiTi), which are employed in implants and sophisticated medical equipment that need to be more flexible, etc.
If the best indicators of the recoverable deformation of the NiTi reaction can be obtained, forming an ultramicrogranulated structure by means of a thermomechanical treatment of temperatures less than 600 ° C. While, according to the scientists, the current nitinol manufacturing technologies prevent the reaction and the treatment to temperatures of 800 ° C up to 900 ° C, it is not possible to obtain a large volume of the SMA with the ultra-microgranulated structure.
The experts of the NUST MISIS affirm that he first discovered the parameters of the nitinol thermomechanical treatment, which would allow him to make large pieces of the alloys with shape memory only with the necessary nanostructure, including the carcass.
“We have demonstrated that the deformation temperature of 300 ° C is the minimum possible to pass the deformation diagrams to low temperatures and the high temperatures. tot 600 ° C. This treatment interval is the best to form the ultramicrogranulada structure and increment the functional characteristics of the NiTi aleacion “, explains the employee of the Ultramicrogranulados Metallic Materials Laboratory, NUST MISIS VIS.
In addition to the sciences, the use of non-structured nitinol with the use of new technology will considerably reduce the capacity of metal absorption and increase the safety of the equipment made with the memory effect form.
In the process of investigation, the scientists of the NUST MISIS will first observe the deformation diagrams and study the formation of the SMA structure at temperatures below 600 ° C which are the most appropriate for the formation of nanostructures. According to the scientists, the analysis of the obtained data allows to determine the assimilation of temperature intervals of the dynamic processes of recovery, polygonation and recrystallization of the SMA.
Participating in the research will be the employees of the Institute of Metallurgy and Science of the A. Baikov Materials of the Academy of Sciences of Russia and the Freiberg University of Technology (TUBAF, Germany). The scientific team will continue to develop the recommendations in relation to the thermomechanical treatment of NiTi’s SMA in industrial conditions. The scientists are sure that the reaction of NiTi with the ultra-microgranulated structure and major functional features will allow the creation of a new generation of medical equipment with the effect of memory memory.