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You Professional Nitinol Wire Manufacturers
Beijing GEE SMA Technology Co., Ltd. (GEE SMA) has accumulated a strong workforce of approximately 65 and a comprehensive manufacturing capacity on closed loop processing, including melting, forging, rolling, drawing, grinding, polishing, electro sparking and laser processing, etc. GEE SMA mainly produce NITINOL SHAPE MEMORY ALLOY sheet, bar, wire, tube and components, especially high-quality plate with thickness from 0.01mm to 10 mm and wire with diameter from from 0.01mm to 7mm up by annual production capacity of 200 tons.
Shape Memory Alloys:
Metals That Remember Their Shape
Shape Memory Alloys (SMA) are a class of metallic materials that have the unique ability to "remember" their original shape.
What are Shape Memory Alloys?
1. Atomic - level mechanism
- The shape - memory effect is based on a reversible phase transformation between two different crystal structures. At a lower temperature, the alloy is in a martensitic phase, which is relatively soft and can be easily deformed. When the alloy is heated above a certain temperature (the transformation temperature), it reverts to an austenitic phase, and it returns to its original shape. This phase transformation is a diffusion - less transformation that involves the rearrangement of atoms. For example, in nickel - titanium (Ni - Ti) alloys, the atoms shift their positions during the phase change, enabling the material to recover its shape.
2. Properties
- Superelasticity: In addition to the shape - memory effect, SMAs also exhibit superelasticity. This means that the material can undergo large deformations (up to about 8 - 10%) and still return to its original shape when the applied stress is removed. This property is due to the stress - induced martensitic transformation.
- Good biocompatibility: Many SMAs, especially Ni - Ti alloys, have excellent biocompatibility. They are corrosion - resistant and do not cause significant immune responses in the body.
Applications of Shape Memory Alloys
Medical field
- Stents: As mentioned earlier, SMA - based stents are widely used in cardiovascular medicine. They can be inserted into narrowed blood vessels in a compressed state and then expand to their original shape as they reach body temperature. This helps to keep the blood vessels open and improve blood flow.
- Orthodontic wires: Ni - Ti wires are used in orthodontics. They can exert a constant, gentle force on teeth over a long period. Their superelastic property allows them to provide the necessary corrective force as the teeth gradually move to their desired positions.
- Surgical tools: Some surgical instruments are made using SMAs. For example, endoscopic graspers can be designed to have a shape - memory effect. They can be inserted through a small incision in a deformed state and then regain their original shape to perform the intended function inside the body.
Aerospace and automotive industries
- Aerospace: In aerospace applications, SMAs can be used for morphing structures. For example, the shape of an aircraft wing could potentially be adjusted using SMA components to optimize aerodynamic performance during different flight conditions such as take - off, cruise, and landing.
- Automotive: They can be used in actuators for various functions. For example, in engine components, SMA - based actuators could help control the flow of fuel or air by changing their shape in response to temperature changes.
Consumer products
- Eyeglass frames: Some eyeglass frames are made from SMAs. They can be bent and deformed without breaking and will return to their original shape.
- Smart textiles: There is research into incorporating SMAs into textiles to create clothing that can change its shape or fit according to the wearer's body temperature or other environmental factors.
Ingot Product
SMA Ingot
SMA Sheet
SMA Tube
SMA Wire
SMA Actuator
SMA Spring
SMA
Other Surfaces
Ni-Ti Alloy Code, Active Af,
Chemical Compositions and Typical Uses
Serial Number
Alloy Code
Typical Active Af
Composition at%
Typical Uses
1
SE 510
-15 to 0° C
51.0Ni
industrial and medical applications, such as antennas,fishing wires,guidewires
2
SE 508
-5 to 10° C
50.8Ni
Widely used in industrial and medical fields
3
SE 508 ELI
0 to 15°C
55.8Ni
Industrial, such as antennas,fishing wires
4
SE NTC
-40 to -25° C
50.8 Ni ，0.30 Cr
Industrial, such as antennas,fishing wires
5
LSE 5065
22 to 37° C
50.65Ni
Binary Ni-Ti for
in-body medical applications
Batch weight greater than 250kg higher fatigue life
6
LSE 507 ELI
22 to 37° C
50.7Ni
Binary Ni-Ti for
in-body medical applications
Batch weight greater than 250kg higher fatigue life
7
SM 499
90° C +/-2 ° C
49.9Ni
muscle wires
8
SM 500
80° C +/-2 ° C
50.0Ni
shape memory applications, actuators, robotics
9
SM 501
70° C +/-2 ° C
50.1Ni
muscle wires
10
SM 502
60° C +/-2 ° C
50.2Ni
shape memory form
11
SM NTC
55 to 70° C,
Hysteresis
(As-Ms)≤ 5° C
Ti50Ni45-41Cu5-9
narrow hysteresis, fast response speed for actuators
12
SM NTCC
20 to 35° C
Ti50Ni44.8-44.6
Cu5Cr0.2-0.4
medical application,ideal
for the field of orthopedics
13
Ni Ti Nb
As'=60°C, Af’=80°C
Hysteresis
(As-Ms)-＞ 110° C
Ni44 Ti47 Nb9
mechanical and aerospace engineering components，such as NiTiNb ring
14
NiTiFe
Ms≤-130°C, As:≤-70°C
Ni47 Ti50 Fe3
Pipe-joint /Tube Coupling
15
NiTiHf
90 to 350° C
Ni38 Ti50 Hf12
High temperature actuators
NOTE:
- SE are typically used for their superelastic properties.
- SM are typically used for their shape memory properties.
- Typical tolerance for custom products is ±2 ° C
Materials Surface finishes
Black or brown Oxide
Polished
Centerless Ground
Other Surfaces
Other Products
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