25/05/2026
Nickel-Titanium Alloy Wire (Nitinol Wire)
Nickel-titanium alloy wire is a shape-memory alloy primarily composed of nickel (Ni 54.5%–57%) and titanium (Ti, balance), combining both shape memory effect and superelasticity, and is known as "smart metal."
✨ Core Features
• Shape memory effect: After deformation at low temperature, the material can fully recover its original shape upon heating to the phase transition temperature (Af), for example, triggered by body temperature at 37°C.
• Superelasticity (pseudoplasticity): Capable of withstanding 8%–10% elastic strain at room temperature (compared to ~0.5% for conventional metals), automatically rebounds after bending, and has a fatigue life of up to 10⁷ cycles.
• Biocompatibility: Non-toxic and low allergenic, superior to 316L stainless steel, suitable for human implantation.
• Corrosion-resistant + high damping: Resistant to bodily fluids and seawater corrosion, with shock absorption capability 10 times that of spring steel.
?? Core Applications (Primarily Medical)
• Orthodontics: Superelastic archwires provide continuous gentle force to align teeth, reducing discomfort.
• Cardiovascular stent: implanted after low-temperature compression, self-expands to open the blood vessel at body temperature.
• Guidewire: Soft and super-elastic, precisely guiding instruments into blood vessels or body cavities.
• Orthopedic/minimally invasive: reduction pins, sutures, intrauterine devices, etc.
• Consumer/Industrial: Memory eyeglass frames, foldable screen hinges, temperature control actuators, aerospace deployment mechanisms.
?? Key Specifications (Medical Grade)
• Diameter: Φ0.05 mm–Φ2.0 mm (commonly used 0.15–0.5 mm).
• Phase transition temperature: Af 0°C–55°C (commonly used at 37°C body temperature type).
• Tensile strength: ≥700 MPa, elongation at break: ≥10%.
