Method for preparing two-way memory nickel-titanium alloy for artificial sphincters through rapid solidification

Abstract

The invention discloses a method for preparing a two-way memory nickel-titanium alloy for artificial sphincters through rapid solidification. The method comprises the following steps of: weighing high-purity nickel and high-purity titanium which are used as raw materials according to the condition that the atomic ratio of nickel atoms to titanium atoms is 51:49; putting and smelting the raw materials a nonconsumable vacuum arc smelting furnace, absorbing molten metal into a copper die cavity by virtue of a negative-pressure suction casting method carried out by a water-cooled copper die, and carrying out rapid solidification, thereby obtaining a material in the required shape; homogenizing the material; fixing the treated material in a semicircular die with curvature radius, deforming the material under constraint of the die to correspond to the curvature of the die, putting the material together with the die into a resistance furnace to undergo constraint aging at 350-500 DEG C which is maintained for 10-100 hours and quenching the material and the die in water, thus preparing the two-way memory nickel-titanium alloy material for the artificial sphincters. The two-way memory nickel-titanium alloy material has narrow temperature zone response, has a straight shape at normal temperatures of human bodies and has bigger deformation curvature after temperature raising, thus being suitable for serving as the function material of the artificial sphincters.

Description

technical field [0001] The invention relates to a two-way memory nickel-titanium alloy material, in particular to a method for rapidly solidifying to prepare a two-way memory nickel-titanium alloy for narrow temperature zone response artificial sphincter, which belongs to the shape memory material in the field of biomedical applications. Background technique [0002] It has been half a century since the discovery of shape memory alloys; so far, there are as many as 50 alloys with shape memory effects, but the ones that are really valuable and have practical engineering applications are mainly NiTi-based, Cu-based, Fe-based alloy. NiTi shape memory alloy has excellent shape memory effect and superelastic behavior, as well as good mechanical properties, corrosion resistance and biocompatibility, so it is the most widely used memory metal among all shape memory alloys. Cu-based shape memory alloys are cheaper than NiTi-based alloys, and their electrical and thermal conductivit...

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Problems solved by technology

These methods often require plastic deformation of the material with a large amount of strain and the introduction of high-density dislocations, and the size, shape, and distribution of the grains are relatively directional (for example, the grains are elongated along the rolling direction and along the rolling direction). The rolling normal direction is flattened) resulting in anisotropy in properties; especially the two-way shape memory effect trained by the dislocation mechanism-dominated method is mainly produced by the martensitic phase transition and its inverse phase transition , the temperature at which the forward and reverse martensitic transformation occurs is low (usually below zero), and the phase transition hysteresis range of the accompanying two-way shape memory behavior is relatively large (50-60°C), and the two-way shape memory effect is also easy decline

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