The invention relates to a production process of titanium-nickel shape memory alloy material, and the produced titanium-nickel shape memory alloy material has shape memory function.
The invention relates to a production process of titanium-nickel shape memory alloy material. Sponge titanium 43% ~ 46% and electrolytic nickel 54% ~ 57% are put into a vacuum induction melting furnace and refined into alloy ingots;
The alloy ingot is forged into a bar with a diameter of 60 ~ 90 mm at a height, and after the surface of the bar is removed from the oxide skin, the bar is drilled through a deep hole to drill into a thick-wall pipe with an outer diameter of 55 ~ 85 mm and an inner diameter of 20 ~ 50 mm, and is made into an extruded billet;
The extrusion billet is hot extruded on the extrusion machine, and the billet is hot extruded into a tube billet with a diameter of 50 ~ 96 mm. The tube billet is mechanically processed to treat its inner and outer surfaces and eliminate the grooves, cracks and deep pit surface defects on its inner and outer surfaces.
The pipes were rolled in LD30, LD15 and LD8 three-roll pipe rolling machines, and the pipes were rolled to a diameter of 0.6 ~ 1.2 mm after repeated vacuum annealing.
The tube with a core rod is pulled off by a drawing machine, and the surface of the tube material is oxidized to produce a titanium-nickel shape memory alloy material.
Ti-ni shape memory alloy has excellent shape memory function and super elasticity. Take advantage of its ability to change its shape with changes in temperature. Such as extending the diameter at low temperature and reducing the diameter at high temperature to clamp the wire to prevent it from falling off. Such as vascular stent, the diameter becomes smaller at low temperature, and the diameter automatically becomes larger when placed in the human body at 37 degrees Celsius to achieve the purpose of propping up large blood vessels. Moreover, it can be processed into sports equipment such as badminton racket frame and racket stick by using its super elastic function. Using Ti-Ni memory alloy's excellent shape memory function and superelasticity, it can be used in medical devices, heart stents, needles, spinal orthopedics, sports equipment, tube head fasteners, etc.
