Overview of Nickel titanium
Nickel titanium, also known as Nitinol, is a metal alloy of nickel and titanium, in which the atomic percentages of the two elements are roughly equal. Different alloys are named according to the weight percentage of nickel, such as nickel. Nitinol 55 and Nitinol 60. It shows the shape memory effect and superelasticity at different temperatures.
Nitinol has two closely related and unique properties: shape memory effect and superelasticity (also called pseudoelasticity). Shape memory is the ability of Nitinol to deform at a temperature, maintain its deformed shape when an external force is removed, and then restore its original undeformed shape when heated above its "transition temperature". Superelasticity is the ability of a metal to withstand large deformations and immediately restore its undeformed shape after the external load is removed. Nitinol deforms 10 to 30 times that of ordinary metals and restores its original shape. Whether Nitinol alloy exhibits shape memory effect or superelasticity depends on whether it is higher than the transition temperature of a particular alloy. Below the transition temperature, it exhibits a shape memory effect; above the transition temperature, it exhibits superelasticity.
The composition of Nitinol alloys determines their performance, which may also be affected by heat treatment and other factors. However, most nitinol alloys have a density of about 6.5 g/cm3, and their melting temperature ranges from 1240°C to 1310°C. The transition temperature can be changed from below -100°C to above 100°C.
The important properties of Nitinol are listed below:
Biocompatibility;
The shape memory effect can produce a huge force;
Moderate impact resistance;
Excellent corrosion resistance;
Shows excellent damping performance below the transition temperature;
Non-magnetic;
Exhibit high fatigue strength;
Moderate heat resistance.
Applications of Nickel titanium
Due to its good biocompatibility, osseointegration and corrosion resistance, nickel-titanium (Ni-Ti) is mainly used in orthopedic implants, orthodontic devices, heart stents, etc. in the medical industry. Shape memory effect (SME) and super elasticity, Nitinol (Nitinol) is also very suitable for automatic actuators, spacecraft, electrical equipment and micro-electromechanical systems (MEMS). Therefore, Nitinol is generally classified as a smart material.
1. Medical applications: stents for cardiovascular use, forceps for removing foreign bodies through small incisions, and anchors for fixing tendons
2. Aerospace and naval applications: couplings and fluid accessories made of Nitinol are used in naval and military aircraft
3. Safety device: fire sprinkler and safety valve/actuator for controlling water temperature
4. Dental: the orthodontic wire that does not require adjustment and re-tightening
5. Other uses of Nitinol:
Fryers and household appliances
Glasses frames
Vibration control when used as engine mount and building actuator
Mobile phone antenna
Seals, fasteners, clamps and connectors
Clothing such as wire bras.
Nickel titanium Price
Nickel titanium price will vary randomly with the production cost, transportation cost, international situation, exchange rate, and market supply and demand of nickel titanium. Tanki New Materials Co.,Ltd Aims to help All industries and Chemical Wholesalers to find high quality, cheap price Nanomaterials and chemicals by providing turn-key customize manufacturing services. If you are looking for nickel titanium, please feel free to send an inquiry for the latest price of nickel titanium.
Nickel titanium supplier
As a global nickel titanium supplier, Tanki New Materials Co.,Ltd has rich experiences in the properties, applications, and cost-effective manufacturing of advanced and engineered materials. The company has successfully developed a series of powder materials (including oxides, carbides, nitrides, single metal, etc.), high-purity targets, functional ceramics, and structural devices, OEM service is available.
More information about Nickel titanium
Nickel-titanium base alloy
Properties | Unit | Ni-Ti |
Tensile strength (in martensite domain) | Mpa | 800–1000 |
Breaking strength elongation | % | 30–50 |
Fatigue limit in austenite domain | Mpa | 350 |
Transformation range | °C | −100 to 100 |
Nitinol transformation properties
Transformation temperature | -200 to 110 deg. C | |
Latent heat of transformation | 5.78 cal/g | |
Transformation strain | for a single cycle | max 8% |
for 100 cycles | 6% | |
for 100,000 cycles | 4% | |
Hysteresis | 30 to 50 deg. C |
Nitinol physical properties
Melting point | 1300 deg. C (2370 deg. F) | |
Density | 6.45 g/cu.cm (0.233 lb/cu.in) | |
Thermal conductivity | austenite | 0.18 W/cm * deg. C (10.4 BTU/ft * hr * deg. F) |
martensite | 0.086 W/cm * deg. C (5.0 BTU/ft * hr * deg. F) | |
Coefficient of thermal expansion | austenite | 11.0E-6/deg. C (6.11E-6/deg. F) |
martensite | 6.6E-6/deg. C (3.67E-6/deg. F) | |
Specific heat | 0.20 cal/g * deg. C (0.20 BTU/lb * deg. F) | |
Corrosion performance | excellent |
Electrical and magnetic properties
Resistivity | austenite | approx. 100 micro-ohms * cm (39 micro-ohms * in) |
martensite | approx. 80 micro-ohms * cm (32 micro-ohms * in) | |
Magnetic permeability | < 1.002 | |
Magnetic susceptibility | 3.0E6 emu/g |
Nitinol mechanical properties
Young's modulus | austenite | approx. 83 GPa (12E6 psi) |
martensite | approx. 28 to 41 GPa (4E6 to 6E6 psi) | |
Yield strength | austenite | 195 to 690 MPa (28 to 100 ksi) |
martensite | 70 to 140 MPa (10 to 20 ksi) | |
Ultimate tensile strength | fully annealed | 895 MPa (130 ksi) |
work hardened | 1900 MPa (275 ksi) | |
Poisson's ratio | 0.33 | |
Elongation at failure | fully annealed | 25 to 50% |
work hardened | 5 to 10% | |
Hot workability | quite good | |
Cold workability | difficult due to rapid work hardening | |
Machinability | difficult, abrasive techniques preferred |
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